RE: [Repeater-Builder] Wacom WP-639 Duplexer question
I'm not surprised- you're asking too much of a duplexer that has four 5 cans. According to my CommShop program, a duplexer with an 80 dB spec is more suitable with transmitter power in the 10-15 watt range, assuming a solid-state PA and a receiver sensitivity around 0.35 uV at 12 dB SINAD. On a 100 watt repeater, I'd expect something like a WP-642, which has six 8 cans. BTDT, got the T-shirt and mug... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of RichardK Sent: Wednesday, September 08, 2010 3:11 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Wacom WP-639 Duplexer question Good evening, our club has a Wacom WP-639 four can duplexer as part of our repeater system. Input Fq is 147.915 and Output Fq is 147.315. We have a 600kHz (+) offset. Very simply, our main problem is when we run the transmitter at full power 100 watts, there is a HUGE desense on the receive side of things. When we drop the transmitter power level to around 20-50 watts, the receive side opens WAY up to a large area where people can get into the repeater. As we begin to bring up the transmitter power, white noise begins to appear and the receive side starts to desense again. All the cables have been switched to double sheilded cables and all the same wavelength in length. We have the duplexer seperated sheilded from the transmitter preamp parts. We have not replaced the antenna feed coax with double sheilded coax yet. Antenna is a Hustler G7 atop a 55' mast. The duplexer was retuned just over 1 year ago. Any suggestions as to what we could look into next? Some of us believe the problem is with the tuning of the duplexer receive cans. Thank you very much.
RE: [Repeater-Builder] Unidentified part in msf5000 vhf station
Its size and location in the RF path suggests that it is an optional preselector. It should have five adjustment screws with locknuts, and bear the designation TFD1011 or TFD1012. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wb5oxq Sent: Sunday, September 05, 2010 8:11 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Unidentified part in msf5000 vhf station I just aquired a second msf5000 to make a 2 meter repeater our of and it has a part not present in the first station. I suspect it could be a rx preamp due to the fact it has coax input and output and it is wired in series between the duplexer rx port and the receiver rf input. It appears to be an aluminum block rack mounted just below the power supply and is about 1.5 thick and about 8 or 9 inches wide. I did not see any electrical connections so if it is a preamp it must get power from the coax into the receiver. I am not familiar with this device. My other station did not have this part. Perhapps it is sopme kind of filter? Both stations are the digital capable models which I program with the rib and old laptop. Any ideas please! Pictures on request if needed.
RE: [Repeater-Builder] Micor UHF Sensivity
Tim, Please confirm that you measured the sensitivity as 0.72 millivolts, or 720 uV- about 2400 times worse than the 0.3 uV you expect. Such a huge disparity points to a failed transistor or a shorted capacitor on the receive board. Perhaps your next step is to perform voltage checks and compare your readings to those in the manual. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Sawyer Sent: Monday, September 06, 2010 10:11 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor UHF Sensivity I have a Micor base that was manufactured in the ham band. Model is C64RXB3196A-SP71. The receiver model number is TRE1241A-SP10 (420-450 Mhz). It came with 4 channels all tuned up and on frequency in the ham band. But the receiver is sensitivity is .72 mv for 20 db quieting on the best channel and .9 on the worst. I went through the alignment procedure and could not make any improvement. Obviously this is not meeting the .5 spec and I was expecting more like .3 or so. So my questions is what should I do to troubleshoot this? Is there some common Micor receiver failure parts or areas that I should be looking into? -- Tim :wq
RE: [Repeater-Builder] Micor UHF Sensivity
Ah, what a difference a factor of 1,000 makes! Okay, the manual spec is 0.5 uV without a preamp and 0.25 uV with a preamp, when using the 20 dB quieting method, and 0.35 and 0.175 respectively when using the 12 dB SINAD method. Try connecting your service monitor directly to the input jack on the preselector and repeat the sensitivity measurement. If it is greatly improved, start looking at cables and connectors. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Sawyer Sent: Monday, September 06, 2010 10:29 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Micor UHF Sensivity Eric, It's 0.72 microvolts. Not totally dead, just a bit numb. -- Tim :wq On Sep 6, 2010, at 10:24 AM, Eric Lemmon wrote: Please confirm that you measured the sensitivity as 0.72 millivolts, or 720 uV
RE: [Repeater-Builder] Micor UHF Sensivity
Readers interested in this thread may find the following articles to be relevant: www.repeater-builder.com/measuring-sensitivity/measuring-sensitivity.html www.repeater-builder.com/tech-info/receiversensitivity.html 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Sawyer Sent: Monday, September 06, 2010 4:00 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Micor UHF Sensivity I have tried with 3 volt meters and 2 SINAD meters: a Fluke 77, a Sinadder 3 (SINAD AC voltmeter) and a HP8924c. Pretty much same results with all. That is 20 db quieting around 0.7 uV, SINAD around 0.35. So what's the recommended meter? Should I trust the SINAD reading and chock the quieting reading up some unknown meter problems? Yes, measuring on the speaker terminals with no speaker. The Sinadder and 8924c have internal speakers but I suspect they are not loading the receiver. Yes. The Micor came with a 3 page document detailing SP71 modifications. Would you like me to scan and email you a copy? -- Tim :wq On Sep 6, 2010, at 3:30 PM, Jeff DePolo wrote: Not all voltmeters behave the same with complex AC waveforms (such as noise). Some of my Flukes are inaccurate at higher AC frequencies (like above a few hundred Hz) - and they're spec'ed that way. What kind of meter are you using, and where are you measuring (speaker terminals is where you should be measuring from)? Do you know what, exactly, the SP features/modifications are on your SP Micor? --- Jeff WN3A
RE: [Repeater-Builder] 19D424089G1
Larry, You have it right- the 19D424089G1 PA is rated at 60 watts over the 132-174 MHz band, with an external relay, and is found in the Mastr Executive II radio. LBI-30253 covers it: www.repeater-builder.com/ge/lbi-library/lbi-30352c.pdf The symptoms you describe may also be caused by a problem in the exciter, the relay, or the system control board. Have you already discounted these possible culprits? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Wagoner Sent: Monday, September 06, 2010 5:27 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 19D424089G1 Anyone have one of the above they wish to part with? We have reason to suspect the PA in our repeater. It has developed various intermittent behaviors (dropping carrier, distorted audio, varying output, etc.) .. I believe this to be the 60 watt PA for the GE Mastr II Exec II mobile radio conversion. If I have the wrong board number, please advise ... Larry Wagoner - N5WLW
RE: [Repeater-Builder] 19D424089G1
Larry, You have it right- the 19D424089G1 PA is rated at 60 watts over the 132-174 MHz band, and is found in the Mastr Executive II radio. LBI-30253 covers it: www.repeater-builder.com/ge/lbi-library/lbi-30352c.pdf The symptoms you describe may also be caused by a problem in the exciter or the system control board. Have you already discounted these possible culprits? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Wagoner Sent: Monday, September 06, 2010 5:27 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 19D424089G1 Anyone have one of the above they wish to part with? We have reason to suspect the PA in our repeater. It has developed various intermittent behaviors (dropping carrier, distorted audio, varying output, etc.) .. I believe this to be the 60 watt PA for the GE Mastr II Exec II mobile radio conversion. If I have the wrong board number, please advise ... Larry Wagoner - N5WLW PRCARC Training Officer PIC - MS SECT ARRL
RE: [Repeater-Builder] Micor UHF Sensivity
Jeff, The DVP Micor uses a TRN8095A AS board, while the non-DVP stations use the TRN6006A board. The only differences involve the values of C231, C232, C233, C234, R234, and R237 which is used only on the DVP board. These components are all clustered at Test Points 12, 13, 14, and 15 on the schematic, and appear to affect only the squelch action. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Sawyer Sent: Monday, September 06, 2010 9:20 PM To: Repeater-Builder@yahoogroups.com Cc: Jeff DePolo Subject: Re: [Repeater-Builder] Micor UHF Sensivity Yes, it is a DVP station. I have the DVP manual and I just checked the spec. It's the same 0.5 uV for 20 dBQ. The test procedure does say to load the speaker. I'll give that a try tomorrow. -- Tim :wq On Sep 6, 2010, at 8:17 PM, Jeff DePolo wrote: The SP docs show it being a DVP station. DVP receivers have wider (and flatter) IF filtering than standard Micor Sensitron receivers. They need a flatter IF passband to decode DVP properly. I'm wondering if that's why the 20 dBQ reading comes out higher than normal. I *thought* the A/S board was the same between DVP and standard stations, so the AF circuitry should be the same between the discriminator and the speaker terminals. --- Jeff -Original Message- From: Tim Sawyer [mailto:tisaw...@gmail.com mailto:tisawyer%40gmail.com ] Sent: Monday, September 06, 2010 8:04 PM To: Jeff DePolo Subject: Re: [Repeater-Builder] Micor UHF Sensivity Here you go Jeff. Let me know what you see.
RE: [Repeater-Builder] Re: Micor Pin Gunk
Tom, Any statements made on the Caig website regarding a comparison of DeOxit and Stabilant, could hardly be judged as unbiased. Legitimate, real-world comparisons of contact enhancement compounds have already been made, many times, by Motorola, IBM, Bendix-King, Hewlett-Packard, Tektronix, and other major manufacturers. I remember an article in Radio-Electronics Magazine, some 30 years ago, where the excellent performance of Stabilant was documented. Many moons ago, I cured a problem with my Apple II+ using Stabilant 22- the plug-in expansion and memory cards had a tendency to walk out of their motherboard sockets and cause intermittent contact. A thorough cleaning with an alcohol-soaked Q-Tip, followed by an application of Stabilant 22A, completely cured the intermittent contact. Don't be concerned about Stabilant 22 becoming hard; it dries into a waxy film that remains pliable for years. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of TGundo 2003 Sent: Saturday, September 04, 2010 9:27 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Micor Pin Gunk Thanks Lou, Bob, Eric, John and the rest! I have a bunch of techs around here that all swear by Deox-it as long as its used sparangily, and Caig seems to hit all concern points in their website vs.22. Has anyone had any specific issues directly related to using Deox-it? I want to do the right thing and will order the 22 if necessary, but not only because it is what Circle M recommends...maybe Deox-it was not around when they made the recommendation? From reading the Caig website I think it may be a better choiceI worry a little about the 22 drying into a rigid form. What happens over time as the pins heat up and expand/contract, especially in a non-climate controlled environment? Tom W9SRV --- On Sat, 9/4/10, wa6epd lme...@cox.net wrote: From: wa6epd lme...@cox.net Subject: [Repeater-Builder] Re: Micor Pin Gunk To: Repeater-Builder@yahoogroups.com Date: Saturday, September 4, 2010, 10:57 PM Bob, NO6B, wrote:- This looks like the same stuff: http://www.micro-tools.com/store/P-22/Stabilant-22-5ml-Kit-Makes-30ml-Of-22 a.aspx The description of how Stabilant 22 works reads very similar to the Caig Labs DeOxIt products. A performance comparison between the 2 products would be interesting. Bob NO6B Take a look at:- http://store.caig.com/s.nl/ctype.KB/it.I/id.1977/KB.215/.f The do the comparison. -Lou- WA6EPD Yahoo! Groups Links
[Repeater-Builder] Motorola 2135 Key (WAS: Mitrek lowband PTT questions)
Marcus, If you can't find a 2135 key at a local two-way radio shop or on eBay, you can still get one from Motorola Parts. The 2135 key is part number 5500893872, currently about US$ 2.25 each. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of x.tait.tech Sent: Saturday, September 04, 2010 10:09 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Mitrek lowband PTT questions what would it take short of some cash to have one sent to me here in New Zealand as a one off key, not that i need one, i am told i am a Hoarder Marcus On Sun, Sep 5, 2010 at 4:38 PM, KP3FT kp...@yahoo.com wrote: Hi all, Thanks for the previous advice on the Mitrek lockout key; I ordered one off Ebay and it worked fine. snip Jeff KP3FT
RE: [Repeater-Builder] Interference on VHF repeater
Brett, Some additional information will be helpful. What makes/models of equipment are in your repeater? Are all jumper cables and the antenna feedline double-shielded? Are any of the connectors nickel-plated? Are there any barrels or adapters in your jumpers? Is there an isolator/circulator following the transmitter? What antenna are you using, and how far above the repeater equipment is it located? Try putting your attenuator right at the RX input connector, and repeat your IM test. Putting it at the antenna output is not a good idea, since the TX output power can cause it to overheat. Your description of the IM product suggests that it might be a spur generated within your PA, which could drift due to temperature changes. Have you verified that your TX carrier frequency is stable, and not drifting? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of brett Sent: Saturday, September 04, 2010 4:27 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Interference on VHF repeater Hi all, I have come across an interesting problem which you may be able to shed some light on. I have an intermod issue where my TX sometimes opens up my RX. I have the distinctive hollow pipe sound. Both TX and RX have the same CTCSS tone. The intermod product is however not always present, and after looking at the RX output from the duplexer with a SA I see a comb of products that move slowly in time. When one of the products in the comb falls within the RX bandwidth the RX opens, until it moves on. This is not a busy site, and I have been able to power down everything on site except my repeater. Problem remains unchanged. I have also disconnected feeders from all other RF equipment on site - still no change. The fact that the IM product frequency changes with time (drift rate is roughly a few kHz's an hour) makes me think that there is either another unknown source of RF on site which has poor freq stability (pretty unlikley), or somehow my TX freq is involved in producing this freq. I have inserted a 6dB pad in the antenna port of the duplexer and found that the IM products drop 12dB, and also curiously, the frequency of the products change. Removing the pad reverses this effect. I have repeated this many times and the result was always the same. It appears that the frequency of the IM product is dependent on the strength of the radiated field from my antenna. This is my question: I have read that it is possible for a strong EM field to excite metal (eg tower member) such that re-radiation will occur at a frequency which is different from that which excited it. Can anyone confirm they have seen this, or can anyone point me to a reference that talks about this? I should also mention there are multiple solar panels and associated regulators on site. The regulators have been discounted as possible sources, but the panels (given they may have bypass/blocking diodes) may be a mixing location, however the source of the drifting tone is still unclear. Thanks, Brett VK2CBD.
RE: [Repeater-Builder] Micor Pin Gunk
Tom, Motorola does not now, and never has, recommended DeOxit or any other contact enhancer gunk besides Stabilant 22. Up until just a few years ago, Motorola specified Stabilant 22A, under part number 1180369E78, which is a mixture of pure Stabilant 22 and isopropyl alcohol. Today, Motorola sells a kit under part number 1180384V93 which comprises a 5 ml bottle of pure Stabilant 22, an empty 15 ml bottle, and some tiny swabs. The user then puts 2.5 ml of the Stabilant 22 into the 15 ml bottle and adds 10 ml of 99% isopropanol to make a working solution of Stabilant 22A, or adds 10 ml of pure ethanol to make a working solution of Stabilant 22E. Either solution is extremely effective if applied wet to clean connectors immediately before mating. It is also effective in curing intermittent contacts in card-edge connectors in PCs and electronic instruments. The alcohol solvent is essential for the product to work; undiluted Stabilant 22 is ineffective. Drug-store isopropyl alcohol, aka rubbing alcohol, should not be used since it is diluted with water and will interfere with Stabilant's action. The 1180384V93 kit is sold by Motorola Parts for about $47, but is sufficient to last for years. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of w9srv Sent: Saturday, September 04, 2010 10:28 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor Pin Gunk Hi Guys! I am in the middle of rebuilding a receive site for one of the area repeaters and have come across some interesting Pin Gunk. I've been told that Motorola techs years ago used to apply some kind of goo to help with the connection on all the backplane pins, etc, but I don't know if this is what that is. This receive site has been developing some intermittant issues on several fronts, and maybe this explains them. The problem with this gunk is that is is non-conductive and a real bugger to clean off. DeOxit seems to work the best. I made this quick video last night showing this on the pins of the power control board. Here is the link to the video: http://www.youtube.com/watch?v=tmWumkQetdY Has anyone else ever come across this? Are there any other steps other than cleaning it off to ensure it will not be another problem in the future? Thanks! Tom W9SRV
RE: [Repeater-Builder] Micor Pin Gunk
John, I did not find Stabilant listed in the Electro-Sonic online catalog, but I did find the identical kit at Micro-Tools for only $38, here: www.micro-tools.com/store/P-22/Stabilant-22-5ml-Kit-Makes-30ml-Of-22a.aspx I also found that Amazon sells the same kit as Micro-Tools, and for the same price of $38. I should point out that the kit does NOT make 30 ml of solution, as the listing implies; if the instructions are followed exactly- adding 10 ml of alcohol to 2.5 ml of pure Stabilant- the kit will make a total of 25 ml of solution. That's because the 15 ml bottle is filled only to the 12.5 ml point, where the bottle begins to narrow. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of John J. Riddell Sent: Saturday, September 04, 2010 11:47 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Micor Pin Gunk Eric, you're singing my tune ! I've used that stuff for many years now and it is really great. It was developed here in Richmond Hill, Ontario, Canada by DW Electrochemicals. As you know only a very small amount is needed on the surface to be effective. The last bottle that I purchased here in Waterloo cost around $35.00. I'd bet that Electro-Sonic would carry it and they are now in the Buffalo areamight be quite a bit cheaper than the Motorola price... John VE3AMZ - Original Message - From: Eric Lemmon wb6...@verizon.net mailto:wb6fly%40verizon.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Saturday, September 04, 2010 2:13 PM Subject: RE: [Repeater-Builder] Micor Pin Gunk Tom, Motorola does not now, and never has, recommended DeOxit or any other contact enhancer gunk besides Stabilant 22. Up until just a few years ago, Motorola specified Stabilant 22A, under part number 1180369E78, which is a mixture of pure Stabilant 22 and isopropyl alcohol. Today, Motorola sells a kit under part number 1180384V93 which comprises a 5 ml bottle of pure Stabilant 22, an empty 15 ml bottle, and some tiny swabs. The user then puts 2.5 ml of the Stabilant 22 into the 15 ml bottle and adds 10 ml of 99% isopropanol to make a working solution of Stabilant 22A, or adds 10 ml of pure ethanol to make a working solution of Stabilant 22E. Either solution is extremely effective if applied wet to clean connectors immediately before mating. It is also effective in curing intermittent contacts in card-edge connectors in PCs and electronic instruments. The alcohol solvent is essential for the product to work; undiluted Stabilant 22 is ineffective. Drug-store isopropyl alcohol, aka rubbing alcohol, should not be used since it is diluted with water and will interfere with Stabilant's action. The 1180384V93 kit is sold by Motorola Parts for about $47, but is sufficient to last for years. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of w9srv Sent: Saturday, September 04, 2010 10:28 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Micor Pin Gunk Hi Guys! I am in the middle of rebuilding a receive site for one of the area repeaters and have come across some interesting Pin Gunk. I've been told that Motorola techs years ago used to apply some kind of goo to help with the connection on all the backplane pins, etc, but I don't know if this is what that is. This receive site has been developing some intermittant issues on several fronts, and maybe this explains them. The problem with this gunk is that is is non-conductive and a real bugger to clean off. DeOxit seems to work the best. I made this quick video last night showing this on the pins of the power control board. Here is the link to the video: http://www.youtube.com/watch?v=tmWumkQetdY Has anyone else ever come across this? Are there any other steps other than cleaning it off to ensure it will not be another problem in the future? Thanks! Tom W9SRV Yahoo! Groups Links
RE: [Repeater-Builder] Re: Circular polarization for VHF repeaters?
I completely agree! Back in the late 60's, I was Chief Engineer at WLRW- the first FM station in the state of Illinois to broadcast in stereo- and this was in Champaign-Urbana, not Chicago! The transmitter was an RCA BTF-10D which fed five Andrew Vee antennas and five Gates Rings, giving us about 25 kW vertical and 25 kW horizontal. The majority of FM stations then used horizontal polarization, for reaching FM table radios that had line-cord antennas and component stereo systems. AM/FM car radios became an option around 1967, and WLRW was ready with a vertical component to better reach car radios. I acknowledge that dual polarization is not the same as circular polarization, but it does accomplish what the station owner wanted back then: Full coverage of home and car/portable radios. I look forward to hearing about the changes that circular polarization can make to VHF repeater coverage. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of sbjohns...@aol.com Sent: Thursday, September 02, 2010 6:48 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Circular polarization for VHF repeaters? FM broadcasting in the US is not changing to vertical polarization. There may be some old stations still running horizontal, and vertical is used in some situations (such as stations low in the band needing to be cross-polarized from a nearby channel 6 TV signal) but circular polarization is by far the preferred method. I've had FM stations running both, and have a firm impression that circular is indeed better for mobile reception. I may get the chance to convert some stations from vertical to c-pol when the rules are changed now that the conversion to HDTV has been made. I may have access to some papers on the subject - I'll check. I believe c-pol could be better for amateur VHF repeater-mobile operations in high-multipath areas. Steve
RE: [Repeater-Builder] Duplexers
Chris, You do not have to use a duplexer, but it makes building a repeater SO much easier! Keep in mind that antenna separation usually means vertical separation, not horizontal separation. Moreover, the same isolation provided by 1000 feet of horizontal separation might be provided by 10 feet of vertical separation. The amount of isolation you need is based generally on the transmit power, frequency separation between TX and RX, and the sensitivity of the receiver. The receiver bandwidth and antenna types also play a factor. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mackey Sent: Monday, August 30, 2010 4:44 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Duplexers Our club was recently given a 220 repeater. We have two seperate antennas. We do not have a duplexer. My question is do we have to have a duplexer? How can we keep the transmitter from desensitizing the receiver? The antennas are apart but can be moved farther. Thanks Chris Kg4bek
RE: [Repeater-Builder] Re: Wouxun Radio
I can't speak for any Wouxun radio, but I have tested at least a dozen Puxing VHF radios, and none of them had reverse burst encode or decode. Besides, the CTCSS tones were sloppy and nothing like a pure sine wave one should expect in a professional radio. The Puxing PX777, in particular, sets the low point in cheap radio quality. Check out my Technical Assessment in the Files section of the Puxing777 Group. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kc7stw Sent: Sunday, August 29, 2010 11:37 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Wouxun Radio It is very funny to me that the cheap Wouxun and Puxing radios have features found on commercial gear. Such a simple thing as reverse burst is added into this cheap radio, but yet our over priced ham rigs don't even offer DPL half the time. --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Ralph Mowery ku...@... wrote: Just about anything around $ 100 or less is a 'throw-away' when it quits on you if you can not fix it yourself. It will often cost that much for any repair. A few years back a local called about getting the dial lights replaced on a transceiver and that was around $ 50 not counting the shipping. Several in the local club have the dual band (144/440) versions and like them. Only negative thing I have seen is that while you are transmitting on one band, you can not receive on the other band at the same time. They do say to get the softwear programming and cable to make it easy.
RE: [Repeater-Builder] Duplexers
Chris, I plugged your frequency separation and power level into CommShop, and assumed a receiver sensitivity of 0.3 microvolts. The program responded that at least 77 dB of isolation is needed for zero desense- which is the obvious goal of any repeater builder. CommShop calculated that 77 dB of isolation can be achieved by 112 feet of vertical separation or 5,681 feet of horizontal separation. I will readily admit that CommShop is not perfect, since it makes many assumptions that may or may not be valid in your particular case. That said, it has been remarkably close in its projections- in my personal experience, anyway. The reality of your situation is that you do not have sufficient real estate or tower height to construct a workable repeater with separate TX and RX antennas. I strongly suggest that you give up on the two antenna idea and start looking for a good used 220 MHz duplexer. My own 220 MHz repeater uses a Telewave TPRD-2254 duplexer, and has been desense-free. Although this duplexer is available new for about $1,120 with a Ham discount, I have seen this exact duplexer on the used market for less than $500. More info about the TPRD-2254 duplexer is here: www.telewave.com/pdf/TWDS-6026.pdf 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of cmcclel...@aol.com Sent: Monday, August 30, 2010 5:45 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Duplexers Thank you for your response. The problem is that the repeater is located on top of a building and the tower on that building is only about 20 feet tall. We can move the two antennas apart horizontally, but only 20 feet vertically. Duplexers are way too expensive and hard to find for the 200 Mhz band. We are running about 20 watts and the frequency separation is 1.6 mhz. Sometimes a week signal comes in and sometimes the transceiver is desensitizing the receiver and covers it up. Any suggestions? Thanks Chris In a message dated 8/30/2010 8:36:53 P.M. Eastern Daylight Time, wb6...@verizon.net writes: Chris, You do not have to use a duplexer, but it makes building a repeater SO much easier! Keep in mind that antenna separation usually means vertical separation, not horizontal separation. Moreover, the same isolation provided by 1000 feet of horizontal separation might be provided by 10 feet of vertical separation. The amount of isolation you need is based generally on the transmit power, frequency separation between TX and RX, and the sensitivity of the receiver. The receiver bandwidth and antenna types also play a factor. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Mackey Sent: Monday, August 30, 2010 4:44 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Duplexers Our club was recently given a 220 repeater. We have two seperate antennas. We do not have a duplexer. My question is do we have to have a duplexer? How can we keep the transmitter from desensitizing the receiver? The antennas are apart but can be moved farther. Thanks Chris Kg4bek
RE: [Repeater-Builder] Re: Wouxun Radio
Phil, What FCC identification number did you use to find the Wouxun listing on the FCC site? I tried both the name and the model number, but came up with no listing at all. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kg6ziu Sent: Sunday, August 29, 2010 8:38 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Wouxun Radio Terry, I wondered the same question about a year ago and discovered that they are type-accepted. Not that I would allow one on a system that I was in charge of for PS work. I looked on the FCC website and saw that they were... There is nothing saying that they can't be used on a HAM system though. Hope this helps, Phil KK6PE --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , terry dalpoas km...@... wrote: This may be a dumb question, but I'll ask anyway. I saw some dual band portables on eBay, new for about $100, made by Wouxun. I doubt very much they are FCC type accepted. Is it okay to use these on amateur frequencies? Thanks in advance. Terry, KM5UQ
RE: [Repeater-Builder] Where do the temp comp resistors from ICM go?
Tony, I suspect that those are temperature-compensating capacitors. Call ICM tech support and get the answer directly from the source. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony KT9AC Sent: Sunday, August 29, 2010 8:56 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Where do the temp comp resistors from ICM go? Sorry to ask a dumb question, but I have some Maxar 50 UHF radios apart that I'm installing crystals from International, and they included what looks like 1% (light green) resistors. I can't see in the Moto manual where they would go since Moto would recommend using their parts. Just need a hey, put them here response. These are not channel elements but the small HC style units. Thanks, Tony
RE: [Repeater-Builder] Re: Wouxun Radio
Doug, You make some very good points, but let's not forget that the proof of FCC approval is not merely a paper label stuck on the radio; there must be a TCB or TA grant published on the OET Web site that lists that specific radio by model number, emission, and frequency range. The FCC is currently investigating the influx from China of cheap portables bearing Puxing, Linton, HYT, and Wouxon brands- some of which have labels that read FCC TYPE ACCEPTED but without an FCC ID number, and no basis in fact of receiving a grant. Indeed, some of these radios share the same internals even though the outside cases are different. On the other hand, one particular brand and model may have different internals. I have a Puxing 777 that has a completely different mainboard from a friend's Puxing 777. We agree that licensed Amateur operators may use these cheap radios on Amateur frequencies without any legal issues. But, the notion that they may be used in Public Safety applications is disquieting. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Doug Bade Sent: Sunday, August 29, 2010 9:11 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Wouxun Radio What I see is they type accepted a radio that looks like that one but the type acceptance number issued does not necessarily mean the Ebay radios are unless they bear the type acceptance label... There are many models and not all may be approved... However... in any case.. if you are the importer for your own amateur radio use... Emissions are your amateur responsibility...ultimately... as we can build or modify whatever we want as long as our emissions are appropriate...re-selling without any type acceptance would seem to be questionable.. My hamfest committee thought about giving them out as hourly prizes... and my caution to them was own use vs distribution are 2 different issues on a non amateur type accepted radio.. If THESE particular one do have part 90 labels.. then using them on amateur ok and is a moot point.. distribution or otherwise.. but if they do not have labels.. using for own use would seem to be the limit.. as selling un-certified radios or even giving them away would seem to be not legal... I would be glad to hear if someone has purchased from one of these dealers and they ARE bearing part 90 labels... then my hamfest committee would be ok.. Doug KD8B On 8/29/2010 11:54 AM, Eric Lemmon wrote: Phil, What FCC identification number did you use to find the Wouxun listing on the FCC site? I tried both the name and the model number, but came up with no listing at all. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of kg6ziu Sent: Sunday, August 29, 2010 8:38 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Re: Wouxun Radio Terry, I wondered the same question about a year ago and discovered that they are type-accepted. Not that I would allow one on a system that I was in charge of for PS work. I looked on the FCC website and saw that they were... There is nothing saying that they can't be used on a HAM system though. Hope this helps, Phil KK6PE --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , terry dalpoas km...@... mailto:km...@... wrote: This may be a dumb question, but I'll ask anyway. I saw some dual band portables on eBay, new for about $100, made by Wouxun. I doubt very much they are FCC type accepted. Is it okay to use these on amateur frequencies? Thanks in advance. Terry, KM5UQ . http://geo.yahoo.com/serv?s=97359714/grpId=104168/grpspId=1705063108/msgId= 103277/stime=1283097296/nc1=1/nc2=2/nc3=3
RE: [Repeater-Builder] dumb question: what is purpose of lock on Mitrek?
Jeff, The reason that most trunk-mount radios are locked is to prevent theft and tampering. The lock has no electrical function. You will need the ubiquitous #2135 key to unlock your Mitrek drawer. You definitely want to open up the radio before applying power to it, so that you can ascertain if the channel elements are in place, and what optional components are installed. Since Motorola shipped two keys with every radio sold, most radio shops will have a drawer full of #2135 keys. If you ask, you will likely get one or two free. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of KP3FT Sent: Sunday, August 29, 2010 9:09 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] dumb question: what is purpose of lock on Mitrek? Hi, I know it's a dumb question, but after scouring the internet for info, I find everything about locks and replacement keys for Motorolas and other radios, but I still don't know what locking the Mitrek actually does. Does it kill all power to the radio, or disable certain functions? I'm asking because I just acquired a low-band Mitrek that I need to power up and verify its working condition. It doesn't have a control head, so I need to use the front panel pins, but if the radio is locked, I may end up getting nowhere and still not know if it's either the radio that is bad, it is locked out, or I wired it wrong. This is the first Mitrek I've had. Thanks for any help. Jeff KP3FT
RE: [Repeater-Builder] ariels
Antony, For a rough approximation, one must know the following information: Transmitter frequency in MHz, Transmitter power in Watts, Receiver frequency in MHz, and Receiver sensitivity in microvolts or dBm. As an example, let's assume that your repeater transmits at 147.300 MHz with 50 watts, and receives at 147.900 MHz with 0.3 microvolts of sensitivity. My CommShop software program estimates that about 89 dB of isolation between TX and RX is needed, and this isolation can be met with separate antennas 220 feet apart vertically or 21,782 feet apart horizontally. Obviously, horizontal separation of more than four miles is impractical unless a link radio is used. The vertical arrangement is assumed to be in line, with one antenna exactly above the other. Although vertical separation is practical when a tall tower is available, the use of Heliax or similar hardline with 100% shielding is mandatory. Keep in mind that programs such as CommShop make some assumptions about your radios that may be erroneous. YMMV... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of antony Sent: Sunday, August 29, 2010 2:35 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] ariels using two radios as a repeator with two ariels. how far appart would the ariels be best. thanks antony
RE: [Repeater-Builder] MSR 2000 VHF Base Station questions
Dan, The MSR2000 Control and Audio manual is Publication Number 6881061E40, and is still available from Motorola Parts for about $60. Due to copyright restrictions, you will not find a PDF version of this manual on RBTIP while it is still in print. This is a large volume, with many long foldout pages in color, so it would likely cost more to have it copied than to buy it from Motorola. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wb0shn Sent: Sunday, August 29, 2010 3:41 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MSR 2000 VHF Base Station questions Just acquired a MSR 2000 VHF base station at a Hamfest. It had a problem in the PA Deck (intermittent duty 100 watt version) but I have fixed that already (bad solder joint on one of the output transistors). It is a two receiver carrier squelch only model. I found a copy of the RF manual on the net to download, but have not been able to find a copy of the control deck manual yet. Does anyone know where I can get a PDF copy? Has anyone used one of these to build a two meter repeater? Will the Intermittent duty PA survive at half power? Any help would be appreciated. The machine is set up for wireline tone 2 frequency right now. Thanks, Dan
RE: [Repeater-Builder] Micor squelch with PL
Terry, Ideally, the Micor squelch should be used in conjunction with the Micor PL decoder, so that you can realize the benefit of reverse-burst squelch tail elimination. The TS-64 does not have reverse-burst STE. You may be able to achieve a satisfactory squelch action by using a short audio delay. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of terry dalpoas Sent: Saturday, August 28, 2010 4:09 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor squelch with PL I have several Micor squelch boards that I plan to use on some future repeater projects. I want the repeaters to be accessed with a PL tone. I will set this up where there has to be a carrier along with PL. If I do this, will I still have the nice sounding Micor squelch, or will the PL decoder do away with it? Decoder will be a TS64.
RE: [Repeater-Builder] Can a Master 3 narroband
Tom, The narrowbanding kit produced by Communications Specialists and others is for the receiver section, and does not affect the transmitter section. The emission mask specified by the FCC for mandatory narrow band operation must be incorporated by the equipment manufacturer and then tested by an FCC-approved agency. This process has never been in the hands of the owner or user, despite widespread popular belief to the contrary. Simply reducing the deviation to a lower setting does not magically make a transmitter narrow band compliant; the limiting circuitry must be modified as well. Moreover, the FCC Type Acceptance for both the MSR2000 and the Mitrek does not include narrow band (11K2F3E) emissions. Naturally, these requirements apply only to commercial usage under Part 90 Rules. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tom Manning Sent: Friday, August 27, 2010 10:57 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Can a Master 3 narroband Hello Jim I note your message about narrowbanding and the comment about the MSR2000. I have seen no info on doing so but it seems to me that the MSR200 could be narrowbanded. The MSR is very similar to the Mitrek and it can be narrowbanded by using a kit by a company that slips my mind. Therefore I feel narrowbanding would be possible. I will be attempting this in six months or so. 73 de Tom Manning, AF4UG - Original Message - From: Jim in Waco WB5OXQ mailto:wb5...@grandecom.net To: Repeater-Builder@yahoogroups.com Sent: Friday, August 27, 2010 10:07 AM Subject: [Repeater-Builder] Can a Master 3 narroband I have a uhf master 4 that has been used for years as a paging exciter. Now the pager business is in the tank I would like to make the master 3 into aq repeater for commercial needs to replace a msr2000 because the msr cannot narroband. If the ge can't either I dont want to waste time and just buy a new repeater that can narroband. wb5...@grandecom.net
RE: [Repeater-Builder] Can a Master 3 narroband
Yes, and the switch from 15 kHz (wideband) to 5 kHz (narrowband 20K0F3E) was simple compared to the new narrowband 11K2F3E emission, which has specific emission masks that are mandatory. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Friday, August 27, 2010 12:32 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Can a Master 3 narroband I'm guessing it was permitted back then. Chuck WB2EDV - Original Message - From: MCH m...@nb.net mailto:mch%40nb.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, August 27, 2010 3:26 PM Subject: Re: [Repeater-Builder] Can a Master 3 narroband How did they handle this back in the 60s/70s when I remember seeing Adjusted for narrowband +/- 5 kHz stickers on the radios? Were those factory stickers? Joe M. Eric Lemmon wrote: Tom, The narrowbanding kit produced by Communications Specialists and others is for the receiver section, and does not affect the transmitter section. The emission mask specified by the FCC for mandatory narrow band operation must be incorporated by the equipment manufacturer and then tested by an FCC-approved agency. This process has never been in the hands of the owner or user, despite widespread popular belief to the contrary. Simply reducing the deviation to a lower setting does not magically make a transmitter narrow band compliant; the limiting circuitry must be modified as well. Moreover, the FCC Type Acceptance for both the MSR2000 and the Mitrek does not include narrow band (11K2F3E) emissions. Naturally, these requirements apply only to commercial usage under Part 90 Rules. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Tom Manning Sent: Friday, August 27, 2010 10:57 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Can a Master 3 narroband Hello Jim I note your message about narrowbanding and the comment about the MSR2000. I have seen no info on doing so but it seems to me that the MSR200 could be narrowbanded. The MSR is very similar to the Mitrek and it can be narrowbanded by using a kit by a company that slips my mind. Therefore I feel narrowbanding would be possible. I will be attempting this in six months or so. 73 de Tom Manning, AF4UG - Original Message - From: Jim in Waco WB5OXQ mailto:wb5...@grandecom.net mailto:wb5oxq%40grandecom.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, August 27, 2010 10:07 AM Subject: [Repeater-Builder] Can a Master 3 narroband I have a uhf master 4 that has been used for years as a paging exciter. Now the pager business is in the tank I would like to make the master 3 into aq repeater for commercial needs to replace a msr2000 because the msr cannot narroband. If the ge can't either I dont want to waste time and just buy a new repeater that can narroband. wb5...@grandecom.net mailto:wb5oxq%40grandecom.net Yahoo! Groups Links -- Internal Virus Database is out of date. Checked by AVG - www.avg.com Version: 9.0.783 / Virus Database: 271.1.1/2746 - Release Date: 03/14/10 03:33:00 Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3097 - Release Date: 08/27/10 02:34:00
RE: [Repeater-Builder] Wacom duplexer
Norm, The P1 duplexer is specified for 150-162 MHz. Having gone down this path before, I strongly suggest that you send the unit to Telewave for re-manufacturing to your specific frequency pair, which I assume to be in the Amateur 2m band. Unless you have unlimited time, patience, and access to a vector network analyzer, you'll be glad you did. When properly re-manufactured, that duplexer will be an excellent performer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of NORM KNAPP Sent: Friday, August 27, 2010 4:26 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Wacom duplexer Hi guys. I just picked up a set of Wacom duplexers. They have this on them: REMEC WACOM 344A3371-P1. They may have come with a GE Mastr III repeater some time back and they are VHF. Does anyone have a spec sheet on these? Thanks N5NPO Norm
RE: [Repeater-Builder] Wacom duplexer
Norm, Okay, so the frequency band will work for 154 MHz, but now the issue is with the minimum TX-RX separation. The spec is 2 MHz minimum, and you have a 1.3 MHz split. If this were not for a Public Safety application, I'd say try tuning it per the GE LBI and see what you get. It might work, but if the performance was not per spec, I'd recommend going for a new duplexer that is designed for this application. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of NORM KNAPP Sent: Friday, August 27, 2010 6:35 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Wacom duplexer Hi Eric. I was not thinking of moving it down to 2m. I was thinking of using for a fire dept. Repeater that has a 1.3 mhz split in the 154mhz area. Looks like these will not work for this particular ap, but something will come up I am sure Thanks! 73 Norm N5NPO - Original Message - From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Fri Aug 27 19:06:30 2010 Subject: RE: [Repeater-Builder] Wacom duplexer Norm, The P1 duplexer is specified for 150-162 MHz. Having gone down this path before, I strongly suggest that you send the unit to Telewave for re-manufacturing to your specific frequency pair, which I assume to be in the Amateur 2m band. Unless you have unlimited time, patience, and access to a vector network analyzer, you'll be glad you did. When properly re-manufactured, that duplexer will be an excellent performer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of NORM KNAPP Sent: Friday, August 27, 2010 4:26 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Wacom duplexer Hi guys. I just picked up a set of Wacom duplexers. They have this on them: REMEC WACOM 344A3371-P1. They may have come with a GE Mastr III repeater some time back and they are VHF. Does anyone have a spec sheet on these? Thanks N5NPO Norm
RE: [Repeater-Builder] GE MASTR II Repeater Module
John, The 19D426660G6 module is intended to be used for transmitter control in a Mastr II two-frequency tone control base station. The manual that covers this specific module is LBI-30709. Unfortunately, the RBTIP GE Index does not have this LBI in its files. To the best of my recollection, yours is the first and only request for that LBI. A standard GE part number comprises six digits between the D and the G. We Americans have become sloppy with regards to the digit zero and the letter O. Sports fans talk about the score being O to one, we have military equipment that is Mark 1 mod O, and we dial O for Operator, where O in these examples is assumed to be pronounced OH. But, most phones have the zero button labeled operator, and dialing the letter O is actually the digit 6! I guess I'll just take Highway 101 to Los Angeles for the next Hamfest- that's Highway One-Oh-One, not Highway One Hundred-One, or Highway One-Zero-One. Re your second question, no. These are tone control modules that do not care what RF frequencies or bands are involved. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of La Rue Communications Sent: Thursday, August 26, 2010 11:46 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE MASTR II Repeater Module I have here a GE MASTR II Repeater XMTR Control Module p/n PL19D416660G6 REV A. I am more familiar with Micor Parts and Components - so I need a little guidance here. I recall seeing some MASTR dialogue recently, which is why I felt compelled to post here. Couple questions...On the p/n are the 0 (Zero) and O (Letter O) interchangable, does it matter? Just trying to figure out why Google doesnt turn anything up. Second question - are the modules band specific? Im currently looking through the TIP but I dont even know where to begin! THats the cool thing about RB.com - so much information :-) Thanks in advance! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
RE: [Repeater-Builder] Adding capacitors to lower electric bill
Like a bad penny, this urban legend just keeps coming back. Since a kWh meter, whether mechanical or electronic, measures only real power, the addition of a capacitor- which adds capacitive reactance- cannot affect real power. A residential customer will never see a reduction in the amount of real power measured by the meter after adding a capacitor. That said, some electronic meters can display and record reactive power and energy- but that is not real power. The same is not true for an industrial customer that has a large number of motors. A lightly-loaded induction motor will impose a low power factor on the electrical supply system, which then must supply the reactive currents when needed- even though those reactive currents are returned to the source later in the cycle. As a result, the utility must have larger substations and heavier conductors to handle such loads. To force industrial customers to raise their power factors, utilities impose a penalty for low power factors. Most power utilities want their industrial customers to have PF above 95%. So, in this unique case, adding capacitance downstream of the electric meter WILL reduce the power bill, but only because it reduces or eliminates the low PF penalty and not because it affects the kWh consumed. One of the reasons why this so-called energy saver sounds attractive is because the average Joe Citizen may think that he can measure power in an AC circuit by multiplying the voltage across the line by the current flowing through the line. That product is volt-amperes, not watts, and it will go down when a capacitor is added- if the power factor is not unity. The only way to correctly measure real power in watts is to use an instrument that incorporates a four-quadrant multiplier, which determines the instantaneous product of volts and amperes throughout each sine wave cycle. Although commercial wattmeters can cost hundreds of dollars, there is at least one device on the market, called the Kill-A-Watt which is marketed by several vendors for less than $25. I bought one of these devices, and was surprised to discover that its power readings were within 5% of those displayed on my digital wattmeter. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Friday, August 20, 2010 6:00 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Adding capacitors to lower electric bill A while back, maybe a year or two ago, there was a discussion on here where a list member had success adding a capacitor to his electric service which reduced his bill. It was debated for a while. Anyway, I am wondering if the utility company ever came and replaced the spinning disk meters with electronic versions, and if so, what the outcome was. Could the original poster respond either here or privately? I just today had a similar discussion with another ham who tried essentially the same thing with no success - only his was a commercial model, so it cost him considerably more. Chuck WB2EDV
RE: [Repeater-Builder] Adding capacitors to lower electric bill
Larry, No, it would not. As has already been noted, adding capacitance to the line does not affect kWh, which is the energy that does work and which you pay for. Indeed, if every customer on a grid were to achieve and maintain a unity PF, the utility would benefit by being able to defer the purchase and installation of capital equipment such as substations and uprated power distribution networks. The most obvious indicator that someone is stealing power is a sudden and large drop in the meter readings when the occupancy of the premises has not changed. The utility's Fraud Investigation Unit will likely install a test meter upstream on a pole or in a vault where the suspect customer cannot get to it, and compare the two meters. Power theft seldom goes undetected, and the punishment is severe. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Sunday, August 22, 2010 9:35 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adding capacitors to lower electric bill And if the capacitor trick did work, would this not be theft? lh snip
RE: [Repeater-Builder] Adding capacitors to lower electric bill
Bill, A customer who causes physical (read, easily detected by the meter reader) damage to a meter is quite possibly deranged. A tamperproof cover will not deter some really creative power thieves who cut into the service conduit upstream of the meter and tap into the wires- often to feed a very heavy load such as an electrically-heated spa. I have seen pictures of such handiwork where the service mast was cut into at the attic level, so it was not visible to the meter reader. The thief was caught when the meter at the transformer suddenly did not match the sum of the residential meters. The denial of service is a last-ditch resort of any utility provider, since the County Health Inspector can declare the house to be uninhabitable and cause the residents to be evicted until service is restored and inspected. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Bill Smith Sent: Sunday, August 22, 2010 10:25 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adding capacitors to lower electric bill The answer is simple. The electric company refuses to provide service to that location. Or, installs a tamperproof cover over the meter, relocates the meter up on the pole, or installs a new electronic meter. They can also go by historical use data for that property and sue the customer for it. From: Chuck Kelsey wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com Sent: Sun, August 22, 2010 12:11:38 PM Subject: Re: [Repeater-Builder] Adding capacitors to lower electric bill Power theft seldom goes undetected, I'll agree. and the punishment is severe. Not always. I can cite where a customer drilled hole in electric meter glass to allow an object to be inserted to prevent disk from spinning. Case presented to district attorney. No prosecution. Same customer did same thing with water meter later on. Same result with district attorney - no prosecution. Go figure. Chuck WB2EDV
RE: [Repeater-Builder] Polyphaser Question
Mike, Perhaps the best course is to choose the unit with the highest Joule rating that meets your power level and frequency ratings. Do not buy a DC-blocked unit if you don't need that feature, because the capacitor is usually the first component to fail. Do not buy a used unit, because it was pulled from service for a reason- probably because the gas tube has reached the end of life due to multiple firings. Finally, be certain that you have a robust grounding connection from the PolyPhaser to Mother Earth; do not depend on the green wire conductor in the power cord to provide this connection. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael Ryan Sent: Monday, August 16, 2010 11:51 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Polyphaser Question I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike
RE: [Repeater-Builder] Polyphaser Question
Steve, PolyPhasers are popular with Hams and commercial users with tight budgets, but they are the economy line as lightning and surge protectors go. Most cellular systems and professional installers prefer to use Huber + Suhner protectors, which cost two or three times what a PolyPhaser costs. I use them at all of my repeater sites, not only because they are waterproof and very robust, but also because the gas tube is easily replaced. The body of the typical unit is machined from a solid billet of stainless steel, and is completely reliable. More information is here: www.hubersuhner.com/ie70/products/hs-p-rf/hs-rf-lightning-protectors.htm H+S products are distributed through commercial communications suppliers such as Tessco, Hutton, and Talley. I have no financial relationship with H+S, being just a satisfied customer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of STeve Andre' Sent: Tuesday, August 17, 2010 7:53 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question This has been a great discussion. Eric, from the reading I've done it didn't seem to me that the Polyphasers were the best out there, but a European company whose initials were S + H, I think. Care to comment on the best ones, in your opinion? On Tuesday 17 August 2010 21:53:30 Eric Lemmon wrote: Mike, Perhaps the best course is to choose the unit with the highest Joule rating that meets your power level and frequency ratings. Do not buy a DC-blocked unit if you don't need that feature, because the capacitor is usually the first component to fail. Do not buy a used unit, because it was pulled from service for a reason- probably because the gas tube has reached the end of life due to multiple firings. Finally, be certain that you have a robust grounding connection from the PolyPhaser to Mother Earth; do not depend on the green wire conductor in the power cord to provide this connection. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 16, 2010 11:51 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Polyphaser Question I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike -- STeve Andre' Disease Control Warden Dept. of Political Science Michigan State University A day without Windows is like a day without a nuclear incident.
RE: [Repeater-Builder] Polyphaser Question
Ray, I suggest that you obtain the most recent edition (2011) of NFPA 780, the Standard for the Installation of Lightning Protection Systems, and install a proper lightning protection system for your antenna and mast per that document. It can be purchased for about $40, but you might find a copy in a municipal library. Please be aware that installing an antenna atop a building that has no lightning protection system installed may impose liability on you, if the antenna is not protected by a proper system and a fire or other damage occurs due to a lightning strike. In some landmark cases, the insurance company declined to pay for damages resulting from a poorly-designed and/or -installed LP system. Choose wisely... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ray Brown Sent: Tuesday, August 17, 2010 8:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its roof? (this is to link an ambulance at a hospital to its base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN
RE: [Repeater-Builder] RG-142, RG-400 va RG-223
I should have mentioned that RG-223 has a solid silver-coated copper center conductor, while RG-400 has a stranded silver-coated center conductor, which makes RG-400 better suited where flexibility counts. RG-142 has a solid steel center conductor that is solver coated and copper clad, but it should not be used where it will be flexed after installation. The big disadvantage of RG-223 is the power-handling capability. RG-223 is rated for just 86 watts at 400 MHz, while RG-400 (and RG-142) are rated for 1100 watts at 400 MHz. RG-223 has 50% greater attenuation at 50 MHz and 15% greater attenuation at 400 MHz. RG-223 will be okay in most applications, but the power-handling limitations and its attenuation should be considered. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Wednesday, August 11, 2010 5:20 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] RG-142, RG-400 va RG-223 Sid, RG-223 will be fine, provided that you use silver-plated connectors that are specifically designed for that cable, and avoid using any barrels or between-series adapters. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Sid Sent: Wednesday, August 11, 2010 11:51 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] RG-142, RG-400 va RG-223 I have seen a lot of jumpers, interconning cables, duplexer cables, etc made using RG-142 and RG-400 (the 400 is preferred). However, RG-223 is also silver, double shielded,very flexible, and also about RG-58 size. Any reason why RG-223 would not work just as well; other than it is not a teflon cable? Sid.
RE: [Repeater-Builder] Coax length, etc.
Kevin, Don't feel bad- look at the number of postings that use you instead of your, your instead of you're, mhz instead of MHz, Khz instead of kHz, it's instead of its... the list is endless! But, back to the thread... it's refreshing to see that more than a few list members know that a dummy load is purely resistive, while a duplexer cavity is reactive- explaining why a transmitter that works perfectly when feeding a dummy load can be unstable when connected to a duplexer. This discussion is both informative and quite entertaining! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer Sent: Saturday, August 14, 2010 10:15 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Coax length, etc. Kevin Custer wrote: Joe Ham buys a new duplexer and hooks it up to his 110 Watt MASTR II repeater and gets 50 watts out the antenna port. He does his homework and realizes that he should only be loosing 29% Wow - loosing - that should have been losing - that's what I get for being in a hurry
RE: [Repeater-Builder] Another stolen repeater (California)
Gee, It would be VERY helpful if the actual Telecom Service Number and the actual CDF Property Number were provided, up front, along with a TELEPHONE NUMBER to report finding this unit! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of John Gleichweit Sent: Wednesday, August 11, 2010 8:29 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Another stolen repeater (California) Full View This weekend we had a CDF repeater stolen from the Ben Bolte site in El Dorado Hills. It disappeared somewhere between Saturday evening and Sunday morning. What I would like is for your folks to keep their ears open for any talk about new equipment, specifically Daniels equipment. This repeater is a Daniels MT-4E repeater with a Daniels model P11-5EA1-05-004 power amplifier (100 Watt) and 2 Liberty LS12-100 batteries. The repeater unit has both a Telecom Service Number sticker on it as well as a CDF Property Number sticker. This had to be someone who had authorized access to this site or someone disclosed access information to someone. Whoever stole the repeater knew what they were after and how to access this site. There was no damage to site, the rack or other equipment in our rack or the rack next to ours. In fact, they left 2 GE MASTR III radios untouched in the rack next to ours. In our rack, they left the duplexer (6 cavity), the power supply and the IM panel. Al l this adds up to someone who knows radio, this site and wanted a repeater, specifically a Daniels as they probably have programming capabilities. Thanks for keeping your ears open. A subsequent message puts the actual repeater vault location as an American Towers vault above Ione in Amador County. -- John Smokey Behr Gleichweit FF1/EMT, CCNA, MCSE IPN-CAL023 N6FOG UP Fresno Sub MP183.5 ECV1852 List Owner x10, Moderator x9 CalEMA 51-507 http://smokeybehr.blogspot.com http://www.myspace.com/smokeybehr
RE: [Repeater-Builder] RG-142, RG-400 va RG-223
Sid, RG-223 will be fine, provided that you use silver-plated connectors that are specifically designed for that cable, and avoid using any barrels or between-series adapters. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Sid Sent: Wednesday, August 11, 2010 11:51 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] RG-142, RG-400 va RG-223 I have seen a lot of jumpers, interconning cables, duplexer cables, etc made using RG-142 and RG-400 (the 400 is preferred). However, RG-223 is also silver, double shielded,very flexible, and also about RG-58 size. Any reason why RG-223 would not work just as well; other than it is not a teflon cable? Sid.
RE: [Repeater-Builder] Another stolen repeater (California)
Chuck, Negative. The contact info you just posted was regarding an Agilent model E4405B Spectrum Analyzer. My posting was regarding Another Stolen Repeater with which David Nuechterlein has no connection. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Wednesday, August 11, 2010 5:21 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Another stolen repeater (California) The contact info was in the original post. It is: David Nuechterlein Q-TV , WDCQ TV 15 PBS , WUCX 90.1 NPR Delta College / Delta Broadcasting , Engineering Dept A045 Frank N. Andersen Broadcast Building 1961 Delta Rd. University Center Michigan 48710 989 686 9341 Office 989 326 0051 Mobile Office - Original Message - From: Eric Lemmon wb6...@verizon.net mailto:wb6fly%40verizon.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Wednesday, August 11, 2010 8:13 PM Subject: RE: [Repeater-Builder] Another stolen repeater (California) Gee, It would be VERY helpful if the actual Telecom Service Number and the actual CDF Property Number were provided, up front, along with a TELEPHONE NUMBER to report finding this unit! 73, Eric Lemmon WB6FLY
RE: [Repeater-Builder] Can a KLN 6210A vibrasender be substituted for a KLN 6209A vibrasponder?
Brian, Yes, probably. The coils have different impedances, and the armatures have different masses, but they are close enough that in most cases they are interchangeable. That said, Motorola did make them different for a reason- most likely that one was more sensitive as a vibrasponder, and the other worked better as a vibrasender. I recommend that you use the specified part for optimum performance. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Brian J. Henry Sent: Monday, August 09, 2010 11:34 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Can a KLN 6210A vibrasender be substituted for a KLN 6209A vibrasponder? I have an MSR 2000 repeater that I want to change the PL frequency on. Does anyone know if a KLN 6210A vibrasender will work in place of a KLN 6209A vibrasponder on the MSR 2000 PL board? Curiously, Brian Henry, WB6QED
RE: [Repeater-Builder] MTR-2000 mic jac
Norm, I doubt it. The GMN6147B mike that is specified for the MTR2000 station is an optional mike for the MCS2000 mobile radio, which normally uses HMN4069E, HMN4072E, or NMN6210D mikes. Since these mikes are not used on MaxTrac, GM300, or M1225 mobile radios, there is likely to be a significant incompatibility. Note that the GMN6147B mike has three side buttons that are used for various control functions within the MTR2000 station and the MCS2000 mobile radio. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of NORM KNAPP Sent: Wednesday, August 04, 2010 9:51 AM To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] MTR-2000 mic jac is the mic jack pin-out the same on the MTR-2000 repeater as it is on a Maxtrac or GM300 or M1225? Thanks Norm N5NPO
RE: [Repeater-Builder] AGM Batteries
Tim, If your batteries are truly VRSLA/AGM (Valve-Regulated Sealed Lead-Acid, Absorptive Glass Mat) units, you have nothing to worry about- IF the solar charge controller is capable of controlling the charge energy going into the battery bank. VRSLA batteries are designed so that the gases that are produced during normal charging are recombined and not vented. In fact, the batteries in a properly-designed solar system will never vent. The solar charge controller should be placed in the same environment as the batteries, in order to properly sense their temperature. My first solar-powered repeater has been in operation since January 2003, and everything except the antenna is in a large Hoffman cabinet- including the radio- with no signs of corrosion. The only solar systems that I know have problems, have a home-made (read: kluge) controller that is not up to the exacting task of controlling energy into and out of a battery bank, or are using automotive (wet-cell) batteries. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301 Sent: Saturday, August 07, 2010 2:05 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] AGM Batteries Hi Folks, I got a couple of the large AGM batteries for a solar installation, and was wondering if there is any condition that will lead them to vent inside the enclosure? They are sealed, but probably have one-way valves. Can I put the solar controller in the same enclosure? Figured some of you folks have done solar stuff before. Thanks, Tim
RE: [Repeater-Builder] TPN1185B
Henry, The TPN1185B is a 500 watt (35 amps at 14 volts) battery charger power supply used in 75/100/110 watt MSF5000 stations. It is a ferro-resonant unit that is reliable but rather inefficient. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of k4...@charter.net Sent: Friday, August 06, 2010 9:18 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] TPN1185B Just got a Motorola cabinet with the above power supply. Does anyone know the ratings of this supply, or what equipment used it? Is it worth keeping or just junk ? Henry
RE: [Repeater-Builder] Mastr II Mobile Repeater?
John, The unit is a full-duplex RCC (Radiotelephone Common Carrier) mobile telephone, not a repeater. The breakdown of the Combination Number, and a complete list of all LBIs that apply to that radio are found in Publication Index PC18, here: www.repeater-builder.com/ge/product-code-indexes/index-pc18-mastr-exec-ii-r cc-and-imts-mobiles.pdf 73, Eric Lemmon WB6FLY -Original Message- Quoting La Rue Communications laruec...@gmail.com mailto:LaRueComm%40gmail.com : Gentlemen (And Ladies) I have a MASTR II Exec mobile here, I think its a UHF Repeater. I want to confirm with you - but I am curious what RCC stands for. Comb number YS55SSXX88A. Nothing comes up on Google and not sure which Comb spec sheet to look this up with Hall Electronics or here on RB Archives. Thanks for your input! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
RE: [Repeater-Builder] OT- Dispatcher injured by lightning strike
Whenever I read a report like this, I have mixed emotions. I am surprised that the injury occurred, which is impossible if the facility was properly designed and islanded in accordance with numerous standards, including NFPA 70, NFPA 780, and the Motorola R56 Manual. I am also angry that an official issued the statement that ...the communications system, including its 400-foot radio tower, are grounded in accordance with industry safety standards. That official, and the idiots who designed the communications center, should be fired and/or brought up on criminal charges. The key to a safe installation at a location with an on-site tower is to ensure that all utilities pass through a window where a common ground reference exists. Ideally, the tower should be right next to the facility, so that the same ground reference is used for both. The power transformer that feeds the control room should be in that room, not hundreds of feet away, and the secondary neutral of that transformer should be bonded to the same ground that is used by the telephones, radio system, cable TV, satellite system, and raised-floor supports. If executed properly, the design of the control room creates a Faraday Cage within which all occupants are safe from injury due to GPR (Ground Potential Rise) from a nearby lightning strike. Likewise, all the electronics within the control room are protected against surge damage. It is obvious from the news report that the dispatcher was injured because her headset was at a different potential from her body. The GPR resulting from lightning striking the tower led to thousands of volts difference between the radio control system (the headset) and the floor and counter in the control room- and the chair she was sitting in. It is also obvious that this difference in potential could not exist if the tower and the adjacent control room were grounded in accordance with industry safety standards. Some common sense and credible engineering skills are essential elements in a proper control room design. Many moons ago (late 60's), I was Chief Engineer at radio station WLRW, a 50 kW FM station at Champaign-Urbana, Illinois. During my watch, the station control room was relocated to a building next door. It was my job to supervise the cabling installation within the building and to the transmitter at the base of the tower, which was just over 100 feet away. All of the remote circuits and network feeds came through a grounding window that was common with the power and the tower grounding system. I remember arguing with the Illinois Power foreman about how we needed a separate transformer to power the station, and it had to be installed right at the side of the control room and not in a vault several hundred feet away. The value of designing the entire installation to comply with established industry standards and sound engineering practices was proven many times, when the tower was struck by lightning during a storm, and no damage or injury occurred. Although the station was on automation most of the day, we had live talent from late afternoon to early morning, and at least one lightning strike occurred while on-air talent was at the board and wearing headphones. The lights blinked, but the board operator felt nothing and the show went on. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of tracomm Sent: Thursday, July 29, 2010 9:48 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] OT- Dispatcher injured by lightning strike A dispatcher was treated for electrical shock on May 2 after lightning sent a power surge through the dispatcher's headset. http://richmondregister.com/localnews/x1255109983/Lightning-surge-injures-91 1-dispatcher http://richmondregister.com/localnews/x1255109983/Lightning-surge-injures-9 11-dispatcher
RE: [Repeater-Builder] Re: 420Mhz Radio for Voter?
Don't force a regular (RJ-45 type) 8-wire plug into the mike jack of a CDM radio, unless you never plan on using the DTMF mike made for those radios. That's because the CDM radios use a 10-wire mike jack, and the shoulders of the 8-wire plug will deform the two outside wires in the jack that are used for row and column selection in the DTMF mike. It is very difficult to bend back the outside wires, once they've been damaged. The DTMF mike for the CDM radios does not contain a tone generator like most DTMF mikes; instead, the button positions are fed into the radio where the tones are generated internally. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of MCH Sent: Friday, July 30, 2010 9:22 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: 420Mhz Radio for Voter? snip They share the same programming cable, although most Motorola mobiles do. Hence, the same microphones. snip Joe M. Tim - WD6AWP wrote: Are the CDM's similar to the Radius M1225?
RE: [Repeater-Builder] Repeater transmit levels at the receiver?
Jeff, You did an excellent job of explaining the complex interrelationships among 2m repeaters. However, not all 6m repeaters have a 1 MHz split; my 6m repeater on Tranquillon Peak follows the California band plan and has a 500 kHz split. The duplexer has four cans about 12 in diameter and five feet tall. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Friday, July 30, 2010 7:30 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Repeater transmit levels at the receiver? snip How many thousands of 2m repeaters are out there running 100 watts at 600 kHz offset without desense? Let's be generous and say they have 100 dB of isolation in the duplexer. +50 dBm TPO - 100 dB = -50 dBm transmit carrier hitting the receiver. No big deal. And that's on 2m. The offset on 2m is only 0.4% (0.6 MHz / 146 MHz), whereas on 6m, it's 1.9% (1 / 53 MHz), making isolation requirements that much more stringent on 2m. Now let's look at a 6m example. You have a 6m repeater on a 1 MHz split? Let's say it's on 53.99-, highest channel in the band, putting your receiver on 52.99. Some other ham is working simplex on 52.525, using 100 watts into a unity-gain antenna, and he's 40 miles away. His signal into your receiver, assuming unity gain on your end too, and line-of-sight, is -53 dBm (that's what the free-space path loss works out to: 103 dB for 40 miles on 6m, check my math). Would you expect this guy 40 miles away talking on 525 to desense your repeater? If so, then you should expect *every* ham who transmits on 525 (or potentially any other frequency within 1 MHz of your receiver) within a 40 mile radius of your repeater to cause you desense; those that are closer than 40 miles are just going to desense it even worse. snip --- Jeff WN3A
RE: [Repeater-Builder] Adjusting low power on an R1225 repeater
Joe, Yes, indeed! The UHF high-power version will likely either go spurious or burn up if set that low. The only way to go with the radio you have is to add a 6 or 10 dB power attenuator rated at no less than 25 watts, and set your TX power at the low end. Admittedly, this is a kluge of the first degree, but hey- you asked! Otherwise, try to get your hands on one of the 1-to-10 watt R1225 units, and you can have a ball. I suppose you could modify your high-power R1225 into the low-power version, but that is a lot of work, and the opportunities for permanently damaging the mainboard are legion. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Thursday, July 29, 2010 6:45 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Adjusting low power on an R1225 repeater Hello to All, I want to turn the power down on my Motorola R1225 repeater to about 5 watts. It is the high power UHF version (25-45 watts). The reason for the low power is to drive a power amp at the output I want to achieve. Any drawbacks to running the R1225 this low? 73, Joe, K1ike
RE: [Repeater-Builder] GE Mobile Radio
Charlie, This is a tough one. The Y prefix indicates an RCC duplex radio, and the ER42M and ET59L indicate a Mastr Progress Line 35 watt radio for the 450-470 MHz band. I wonder if the 80 you quoted might actually be 88? Better double-check the Combination Number to make sure you're reading it correctly. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of glad3933 Sent: Thursday, July 29, 2010 7:44 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE Mobile Radio Hi I have an old GE mobile trunk mounting type radio with a control head and can't find any info on the radio. The only numbers are on the front of the radio as follows: YT55TPU80 serial number 2120935 er-42-m FCC DATA ET 59 L. On the front of the radio is a large chrome handle the width of the radio and folds out of the way to allow access to the front of the radio and the cable connectors. I suppose the handle is for carring the radio when it would be removed for service or repair. I think the radio might be a UHF unit. Any help would be appreciated. Thanks Charlie.
RE: [Repeater-Builder] Adjusting low power on an R1225 repeater
Robert, The R1225 was never intended to be used in a heavy duty application. When marketed in its GR1225 desktop configuration, it was presented as a light-duty, local-area repeater for construction sites and similar low duty-cycle applications. Since the GR1225 included a temperature-controlled fan, Motorola suggested that the power be set to 25 watts when heavy use was expected. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Robert McNeill Sent: Thursday, July 29, 2010 8:12 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Adjusting low power on an R1225 repeater Is there an issue running one of those at 25 watts continuous? It is a repeater. What was its intent if not to be used in a heavy duty cycle? 73, Robert K5ILS From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Thursday, July 29, 2010 9:06 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adjusting low power on an R1225 repeater Thanks Eric, I though there was a caveat to turning it down, but couldn't remember why. I want to experiment with an EchoLink repeater, but I'm not sure that the R1225 UHF hi power could hold up at 25 watts continuous duty. I think I'll do some shopping as you suggest. 73 and Thanks, Joe On 7/29/2010 10:01 PM, Eric Lemmon wrote: Joe, Yes, indeed! The UHF high-power version will likely either go spurious or burn up if set that low. The only way to go with the radio you have is to add a 6 or 10 dB power attenuator rated at no less than 25 watts, and set your TX power at the low end. Admittedly, this is a kluge of the first degree, but hey- you asked! Otherwise, try to get your hands on one of the 1-to-10 watt R1225 units, and you can have a ball. I suppose you could modify your high-power R1225 into the low-power version, but that is a lot of work, and the opportunities for permanently damaging the mainboard are legion. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Joe Sent: Thursday, July 29, 2010 6:45 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Adjusting low power on an R1225 repeater Hello to All, I want to turn the power down on my Motorola R1225 repeater to about 5 watts. It is the high power UHF version (25-45 watts). The reason for the low power is to drive a power amp at the output I want to achieve. Any drawbacks to running the R1225 this low? 73, Joe, K1ike
RE: [Repeater-Builder] Re: Motorola R-2200A User Manual
Robert, Perhaps we are stuck on semantics here. There are only two manuals ever published for the R2200-series monitors- the two I mentioned. The Operator's Manual is the one you seek. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Robert Sent: Sunday, July 25, 2010 7:32 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Motorola R-2200A User Manual Thanks for the reply Eric, I have the Maintenance Manual. Did they make a How To type of manual? I know a little bit, but really not sure how to navigate around it. Anyone? Robert KD4YDC --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Eric Lemmon wb6...@... wrote: Robert, I have good news and bad news. The bad news is that the R2200-series Operator's Manual 6881069A79 is out of print and is NLA. The good news is that the R2200A Maintenance Manual 6991069A76 is still available from Motorola Parts, for about $58. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Robert Sent: Sunday, July 25, 2010 5:25 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Motorola R-2200A User Manual Does anyone have a link to this? Would love it if this was in pdf as well ;-) 73, Robert KD4YDC
RE: [Repeater-Builder] Re: Motorola R-2200A User Manual
Jack, What is the publication number of your manual? It's probably the document Robert is looking for. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jack Chomley Sent: Tuesday, July 27, 2010 3:07 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Motorola R-2200A User Manual Robert, I have a user manual for my R-2200B, not sure of the similarities between the 2 models? Cheers, Jack VK4JRC Sent from my Apple iPad Tablet PC On Jul 26, 2010, at 12:32 PM, Robert kd4...@juno.com mailto:kd4...@juno.com wrote: Thanks for the reply Eric, I have the Maintenance Manual. Did they make a How To type of manual? I know a little bit, but really not sure how to navigate around it. Anyone? Robert KD4YDC --- In mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com , Eric Lemmon wb6...@... wrote: Robert, I have good news and bad news. The bad news is that the R2200-series Operator's Manual 6881069A79 is out of print and is NLA. The good news is that the R2200A Maintenance Manual 6991069A76 is still available from Motorola Parts, for about $58. 73, Eric Lemmon WB6FLY -Original Message- From: mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com [mailto: mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com ] On Behalf Of Robert Sent: Sunday, July 25, 2010 5:25 AM To: mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Motorola R-2200A User Manual Does anyone have a link to this? Would love it if this was in pdf as well ;-) 73, Robert KD4YDC
RE: [Repeater-Builder] Service Manuals
John, Before divesting yourself of (possibly rare) service manuals, please review the Repeater-Builder listings to see if any of them might be a candidate for scanning (only if they are out of print) and subsequent posting on the RBTIP for download. A number of very generous folks (you know who you are!) have recently loaned manuals to the RBTIP scanning team for conversion into full-page PDF files. As a result, some manuals that have great historic value are preserved for the benefit of everyone in the radio hobby. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of La Rue Communications Sent: Tuesday, July 27, 2010 11:22 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Service Manuals Gentlemen (And Ladies) - I will be listing some service manuals over the next few weeks to months on our eBay store. If there is any interest in a particular manual (Mostly Kenwood and Motorolas) for the archives here, please feel free to let me know. I wanted to give the group exclusive notice so those that need them, can procure them. Cheers! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn http://tinyurl.com/2dtngmn
RE: [Repeater-Builder] Re: Base station coax connector weatherproofing recommendations?
Tony, Your mentor has the right idea, but a minor change might help. First of all, regardless of the tape used, it should *always* be wrapped from bottom to top, so that it sheds water. Doing it from top to bottom will bring water into the splice- not good! The preferred method of waterproofing connectors starts with Scotch 130C Linerless Rubber Splicing Tape. This is self-vulcanizing tape that is used for high-voltage (12,000 and up) splices, and is the primary waterproofing layer. Follow this with two layers of Scotch Super 88 Vinyl Tape- this stuff is much better than 33 tape, which itself is great stuff. Finally, coat the whole splice with Scotchkote Electrical Sealant. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony Sent: Tuesday, July 27, 2010 8:08 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Base station coax connector weatherproofing recommendations? I was taught by an old ham who did a lot of commercial installations the following. His advice was to use good quality tape 3M 33 or 88 tape. Start at the connector wrap downward past the connector. Spray with clear spray paint. Wrap 2 starts at the bottom the the 1st wrap go upward to the connector. Apply another coat of clear spray to seal the tape. Layer 3 starts at the connector again and goes downward past the end of previous wraps. Spray again. This gives a good water tight job. When you are inspecting the antenna you simply note the direction of the tape if it should come lose. You'll know how immediately it may or may not need attention. I did this after pealing off the sticky mess of coax seal on a rooftop installation. The previous installer was even so thoughtful as to plug the hole in the base of the Stationmaster. Actually the only thing holding the connector to the hardline was the seal as I suspected by the noise when the wind picked up. Several years of PA failures, some years it was twice a year, were history. Tony --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , jland138 jland...@... wrote: Any recommendations or best practices on weatherproofing the coax connection to a base station antenna? The Comtelco XL (or horrors! Antenex FG) series both have a drain system at the base that need to remain open. Is it as simple as some coax seal and avoid plugging the drain holes? Any recommendations on using heat shrink at the cable end of the coax connector? Does it help, or does it eventually wind up as a moisture reservoir?
RE: [Repeater-Builder] Motorola R-2200A User Manual
Robert, I have good news and bad news. The bad news is that the R2200-series Operator's Manual 6881069A79 is out of print and is NLA. The good news is that the R2200A Maintenance Manual 6991069A76 is still available from Motorola Parts, for about $58. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Robert Sent: Sunday, July 25, 2010 5:25 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Motorola R-2200A User Manual Does anyone have a link to this? Would love it if this was in pdf as well ;-) 73, Robert KD4YDC
RE: [Repeater-Builder] Low Band Syntor X9000
John, One very informative source is the Syntor X9000 group, here: syntorx9000-us...@yahoogroups.com 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of JOHN MACKEY Sent: Friday, July 23, 2010 10:20 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Low Band Syntor X9000 Is there anyone in the group who is familar with Low band Syntor X 9000 radios? I would like to go off line in e-mail to ask a few questions. jmac...@usa.net mailto:jmackey%40usa.net thanks
[Repeater-Builder] RE: [GE Mastr II] Help ID 19C321936G2
Corey, That device is definitely for a Mastr II radio, and it definitely plugs into the same place as a Channel Guard module. However, I cannot find any reference to that module in the RBTIP GE files. Curiously, Dale K0JXI, posted an identical request for info on the same board, five years ago: www.mail-archive.com/repeater-builder@yahoogroups.com/msg19706.html 73, Eric Lemmon WB6FLY -Original Message- From: ge-mast...@yahoogroups.com [mailto:ge-mast...@yahoogroups.com] On Behalf Of nativeMT Sent: Friday, July 23, 2010 3:23 PM To: ge-mast...@yahoogroups.com Subject: Re: [GE Mastr II] Help ID 19C321936G2 Eric, Here are links to the front and back of the board. http://kc7mrq.home.bresnan.net/pics/front.jpg http://kc7mrq.home.bresnan.net/pics/back.jpg Have a great day, Corey --- In ge-mast...@yahoogroups.com mailto:GE-MastrII%40yahoogroups.com , Eric Lemmon wb6...@... wrote: Corey, I'm not surprised, because 19C321936G2 is not a valid module or component number. My complete GE microfiche file leaps from 19C321931 to 19C321954. Is this number stamped in black ink along one edge of the board? If not, it may be for a hardware item such as the bare PC board or a bracket. Please describe what model radio this board is in, and what connections go to and from it. A picture would be great. 73, Eric Lemmon WB6FLY -Original Message- From: ge-mast...@yahoogroups.com mailto:GE-MastrII%40yahoogroups.com [mailto:ge-mast...@yahoogroups.com mailto:GE-MastrII%40yahoogroups.com ] On Behalf Of nativeMT Sent: Wednesday, July 21, 2010 7:56 PM To: ge-mast...@yahoogroups.com mailto:GE-MastrII%40yahoogroups.com Subject: [GE Mastr II] Help ID 19C321936G2 Am having a hard time finding any information on this board. Thanks, Corey
RE: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM
Jeff, I suspect you may be headed for disappointment. CTCSS (PL) and CDCSS (DPL) are handled differently within the radio. While the former is audio, albeit sub-audible, the latter requires a DC connection to the modulator in order to create the DCS signal at a 134.4 Hz rate. In other words the CTCSS hardware will not work for CDCSS. Perhaps some readers who have TKR-820 stations with CDCSS capability can advise you about the modifications and/or optional modules that are necessary to handle DCS. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kb1...@wqex694.info Sent: Thursday, July 15, 2010 7:03 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM Ok, I'm playing around with my Kenwood TKR-820 a bit. I've found the instructions for HEX editing the channel and ctcss information after reading it from the EEPROM, and they work great. But there's nothing about DCS. I'm wiing to try and decipher how to get the DCS, but I need a look at the information from a chip that contains DCS information. Since I don't have a real programmer I can't change mine and then look at it. So if anyone has a TKR-820 with DCS in it and a EEPROM reader, it would be greatly appreciated if you are wiling to read the chip with PonyProg2000 (http://www.lancos.com/ppwin95.html) and send me a copy. Thanks, Jeff, KB1SPH / WQEX694
RE: [Repeater-Builder] MASTR II LOW BAND TUNING
Jim, A low-band repeater with a flat-pack duplexer having 90 dB of isolation? That's amazing! My low-band repeater uses four 12 diameter cans that each stand about five feet tall. Your MC74AAU33A radio is an M-series 100 watt mobile radio, covered by PC-61 here: www.repeater-builder.com/ge/product-code-indexes/index-pc61-mastr-ii-m-seri es-mobiles.pdf The transmitter tuning information is covered in LBI-4898, available at the link I gave you earlier. It is not a full-page version, but it will have to do until we can borrow a paper copy to scan. If any readers of this list have a clean and complete original LBI-4898 that we can borrow for full-page scanning, please contact me directly at mycall at verizon dot net. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of James Cicirello Sent: Monday, July 05, 2010 9:54 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Eric, First thanks you for pointing me to the manuals and Don for the NHRC Tuning site. Eric the combination numbers are MC74AAU33A. They came from a trucking company and I think they are on 47.XXX. I am taking over the Wellsville 53.090 Repeater as the original owner is re-locating. He has a custom built repeater MASTR II from Repeater Builder going thru a rack mount flat pack duplexer with about 90 Db of isolation, but there is also 2 Db of receiver loss thru the cans. I have two sites 6 miles apart and I want to try split sites using the above mentioned GE as the TX and use the HOT RX on the custom Repeater for the RX. I am in hopes that all I have to do is tune the TX and hook it to the link radio. 73 JIM KA2AJH On Sun, Jul 4, 2010 at 8:39 PM, Eric Lemmon wb6...@verizon.net mailto:wb6...@verizon.net wrote: Jim, Perhaps you are not aware that Repeater-Builder has a huge index of General Electric manuals. Just look at any Description Maintenance manual for a low-band radio to get the tuning instructions. Since you did not specify exactly which low-band radio you have, any of these LBIs will probably get you going: www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf www.repeater-builder.com/ge/lbi-library/lbi-30293a.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-30293a.pdf Please be aware that even a high-split (33 range) radio may need modification to perform well in the Amateur 6m band. What is the Combination Number of the radio you want to tune? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of James Sent: Sunday, July 04, 2010 3:46 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Guys, Is there a link to tuning a low band mastr II? I have googled and find all kinds of VHF High and UHF but not Mastr II Low. I want to tune to six meters. Thanks JIM KA2AJH -- KA2AJH Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655
RE: [Repeater-Builder] MASTR II LOW BAND TUNING
Jim, I have no experience with such a small duplexer for low-band, since 6m repeaters in my area (Central California) have a 500 kHz split- which requires more isolation than a compact duplexer can muster. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of James Cicirello Sent: Monday, July 05, 2010 2:19 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Again Eric, When you get a chance will you look at these duplexers and give me your opinion? http://www.radiodata.com/fiplex/products/PDFs/DHV05.pdf http://www.radiodata.com/fiplex/products/PDFs/DHV05.pdf The duplexer I got with the repeater is the Model DHV-0544.( THE 533 has been discontinued) The way I am reading their specs it is 90 dB at 1 MHz, Anyone else wish to comment, Chuck you have some 6 meter machines too. I just got these from the owner today and am looking for advice, opinions, etc. This is a new product that he spent a lot of bucks on, so I am looking for opinions, anybody that may have experience with these duplexers, to include a split site Vs these duplexers. Thanks all 73 JIM KA2AJH Wellsville, N.Y. On Mon, Jul 5, 2010 at 2:23 PM, Eric Lemmon wb6...@verizon.net mailto:wb6...@verizon.net wrote: Jim, A low-band repeater with a flat-pack duplexer having 90 dB of isolation? That's amazing! My low-band repeater uses four 12 diameter cans that each stand about five feet tall. Your MC74AAU33A radio is an M-series 100 watt mobile radio, covered by PC-61 here: www.repeater-builder.com/ge/product-code-indexes/index-pc61-mastr-ii-m-seri http://www.repeater-builder.com/ge/product-code-indexes/index-pc61-mastr-ii -m-seri es-mobiles.pdf The transmitter tuning information is covered in LBI-4898, available at the link I gave you earlier. It is not a full-page version, but it will have to do until we can borrow a paper copy to scan. If any readers of this list have a clean and complete original LBI-4898 that we can borrow for full-page scanning, please contact me directly at mycall at verizon dot net. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of James Cicirello Sent: Monday, July 05, 2010 9:54 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Eric, First thanks you for pointing me to the manuals and Don for the NHRC Tuning site. Eric the combination numbers are MC74AAU33A. They came from a trucking company and I think they are on 47.XXX. I am taking over the Wellsville 53.090 Repeater as the original owner is re-locating. He has a custom built repeater MASTR II from Repeater Builder going thru a rack mount flat pack duplexer with about 90 Db of isolation, but there is also 2 Db of receiver loss thru the cans. I have two sites 6 miles apart and I want to try split sites using the above mentioned GE as the TX and use the HOT RX on the custom Repeater for the RX. I am in hopes that all I have to do is tune the TX and hook it to the link radio. 73 JIM KA2AJH On Sun, Jul 4, 2010 at 8:39 PM, Eric Lemmon wb6...@verizon.net mailto:wb6fly%40verizon.net mailto:wb6...@verizon.net mailto:wb6fly%40verizon.net wrote: Jim, Perhaps you are not aware that Repeater-Builder has a huge index of General Electric manuals. Just look at any Description Maintenance manual for a low-band radio to get the tuning instructions. Since you did not specify exactly which low-band radio you have, any of these LBIs will probably get you going: www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf http://www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf http://www.repeater-builder.com/ge
RE: [Repeater-Builder] MASTR II LOW BAND TUNING
I see what the sales flyer says, but the response plots show no real bandpass action. Indeed, the plots depict exactly how a notch-only duplexer responds. In fact, the plots look faked, IMHO. I have tuned many duplexers over the years, and none of the plots look so perfect. If Fiplex duplexers are so great, why aren't they used by large state patrol systems? Is there a list of satisfied customers? Maybe I'm just too cynical, but I think the specs for those duplexers are just too good to be true. I'm going to keep my money in my pocket until I see some credible evidence that these duplexers perform as advertised. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Monday, July 05, 2010 4:18 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING The spec sheet shows them to be bandpass/band reject. From the document: These duplexers utilize six high Q (helical) resonant cavities, interconnected in a band pass-band reject configuration which allows close spaced transmit-to-receive frequency operation. Joe On 7/5/2010 6:33 PM, Chris Curtis wrote: They are notch only devices and I've used similar devices using that helical design for years.
RE: [Repeater-Builder] GE
Bill, The 19D417955G3 power amplifier is for Mastr II stations, and is designed to cover the 36-42 MHz split with 50 watts of power. The manual that covers this particular PA is LBI-4732. Unfortunately, this LBI is not among the hundreds indexed in the GE LBI listing on Repeater-Builder. If any reader of this list has a clean and complete original paper copy of LBI-4732, and is willing to lend it to the RBTIP scanning team, please contact me directly at mycall at verizon dot net. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Bill Isom Sent: Sunday, July 04, 2010 2:32 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE Good morning and Happy Independence Day. I have a VHF Low band continuous duty amp that I would be willing to trade. I don't know much about it. It is marked 19D417955G3 and the card is marked 19D417968G3. It came from a Maryland State Police auction. If you are interested, please contact me off list, And if anyone has info on this amp, please let me know. Thanks Bill N4XIR
RE: [Repeater-Builder] GE continuous duty amp
Jim, That PA is rated at 35 watts, not 40. It is a versatile PA, since it covers 138-174 MHz. More info is in LBI-30423, here: www.repeater-builder.com/ge/lbi-library/lbi-30423.pdf 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jim Lange Sent: Saturday, July 03, 2010 10:09 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] GE continuous duty amp PL19D417535G1 and the REV # is blank. This came from a local organization and was in the 154.XXX range. - Original Message - From: Eric Lemmon wb6...@verizon.net mailto:wb6fly%40verizon.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Sunday, July 04, 2010 00:57 Subject: RE: [Repeater-Builder] GE continuous duty amp What is the model number of your surplus amplifier? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of WA2RJP Sent: Saturday, July 03, 2010 5:39 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] GE continuous duty amp I have a VHF HI 40 watt continuous duty amp that is surplus to my needs. Would anyone be willing to trade for a 6 meter version? This is a working unit that was removed from a station conversion project. Yahoo! Groups Links
RE: [Repeater-Builder] MASTR II LOW BAND TUNING
Jim, Perhaps you are not aware that Repeater-Builder has a huge index of General Electric manuals. Just look at any Description Maintenance manual for a low-band radio to get the tuning instructions. Since you did not specify exactly which low-band radio you have, any of these LBIs will probably get you going: www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf www.repeater-builder.com/ge/lbi-library/lbi-30293a.pdf Please be aware that even a high-split (33 range) radio may need modification to perform well in the Amateur 6m band. What is the Combination Number of the radio you want to tune? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of James Sent: Sunday, July 04, 2010 3:46 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Guys, Is there a link to tuning a low band mastr II? I have googled and find all kinds of VHF High and UHF but not Mastr II Low. I want to tune to six meters. Thanks JIM KA2AJH
RE: [Repeater-Builder] GE continuous duty amp
What is the model number of your surplus amplifier? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of WA2RJP Sent: Saturday, July 03, 2010 5:39 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE continuous duty amp I have a VHF HI 40 watt continuous duty amp that is surplus to my needs. Would anyone be willing to trade for a 6 meter version? This is a working unit that was removed from a station conversion project.
RE: [Repeater-Builder] Erring on the Side of Caution....
John, While I cannot speak for Motorola, it is clear that Motorola's first priority is to protect the copyright of current software. On one programming-oriented site, there is no end of idiots who post messages like, Can anyone send me a copy of the latest software for the XTS5000? And there are idiots who respond with something like, Contact me off-list, or Check your PM. I doubt that Motorola will send out the legal beagles to collar someone who offers RSS for the SP50 or GM300, but I think that anyone who openly offers pirate RSS or CPS that is still being licensed and sold is asking for serious trouble. Big time. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of La Rue Communications Sent: Thursday, July 01, 2010 1:45 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Erring on the Side of Caution Ran across this website http://www.hampedia.net/motorola/mt-1000.php http://www.hampedia.net/motorola/mt-1000.php Found out it has the RSS to the Motorola MT1000. And me being the cautious guy to never get into legal crap with the big boys as I know how Motorola's Software License Agreement is big and scary.. Is this site legitimate or is this site just asking for trouble by posting RSS for the general public? Thoughts? Comments? Should I stay away from these people? Thanks! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn http://tinyurl.com/2dtngmn
RE: [Repeater-Builder] Coax shielding
Ian, RG-213 coax can definitely contribute to desense, as can cheap connectors and adapters. I suggest making up new jumpers using double-shielded coax such as RG-400 or RG-214, and fit these jumpers with high-quality, crimp-on connectors of the correct type on each end so that no adapters or barrels are needed. Don't use LMR400 or similar foil-and-braid cable, as that will add entirely new problems to the mix. If changing the jumpers still leaves some desense, then try increasing the spacing between the link and main antennas- lowering the link antenna should be the first step. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kerincom Sent: Sunday, June 27, 2010 7:51 AM To: mail=repeater-buil...@yahoogroups.com Subject: [Repeater-Builder] Coax shielding Hi guys .I am just wanted to confirm a question on coax shielding . With 2-10 watts transmitting through rg213u could rf be escaping that could cause desensitization to other radios .The repeater I have setup uses 9 meters of heliax from the main diplexer to ant and rg213u from the link radio to its antenna . I am finding I am getting problems with the link transmission interfering with the repeater rx The link antenna is a yagi 3 meters above the ground and the main repeater antenna is 6 meters above it .I am currently trying band pass cavity on the receiver rx or band pass/band reject diplexer with some success but I am wondering if the rf escaping from the cable is causing problems inside the repeater shed even at a low wattage .I am definitely changing the rg213u to either rg223u or lmr400 as it is only on the link radio and shouldn't have any effect on the repeater's operation .Has anyone else had the same sort of problem where the rf energy leaks out of the cable in the shed and causes problems to the repeater and they had to upgrade the link cable to 100% coverage cable   Thank You, Ian Wells, Kerinvale Comaudio, 3A Murchison Street,Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Coax shielding
Ian, Since RG-223 is double-shielded cable and is similar in construction to RG-400, it will be fine- provided you are using the connectors specifically made for RG-223 which has a larger OD than RG-400. Please don't even think about using LMR-400, 9913F, or any foil/braid cable because of their tendency to generate noise. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kerincom Sent: Sunday, June 27, 2010 8:28 AM To: mail=repeater-buil...@yahoogroups.com Subject: RE: [Repeater-Builder] Coax shielding Jumpers between the TX ,rx and diplexer are rg223u .I thought of using rg223u for the link radio to its antenna because it is only aprox 2-3meters long but I felt I should try lmr400 because of the 100% shielding and the link radio is just a standard radio that works in either rx or TX mode and not in duplex mode   Thank You, Ian Wells, Kerinvale Comaudio, 3A Murchison Street,Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au/ ---Original Message--- From: Eric Lemmon mailto:wb6...@verizon.net Date: 6/28/2010 1:24:37 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Coax shielding Ian, RG-213 coax can definitely contribute to desense, as can cheap connectors and adapters. I suggest making up new jumpers using double-shielded coax such as RG-400 or RG-214, and fit these jumpers with high-quality, crimp-on connectors of the correct type on each end so that no adapters or barrels are needed. Don't use LMR400 or similar foil-and-braid cable, as that will add entirely new problems to the mix. If changing the jumpers still leaves some desense, then try increasing the spacing between the link and main antennas- lowering the link antenna should be the first step. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of kerincom Sent: Sunday, June 27, 2010 7:51 AM To: mail=repeater-buil...@yahoogroups.com mailto:mail%3DRepeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Coax shielding Hi guys .I am just wanted to confirm a question on coax shielding . With 2-10 watts transmitting through rg213u could rf be escaping that could cause desensitization to other radios .The repeater I have setup uses 9 meters of heliax from the main diplexer to ant and rg213u from the link radio to its antenna . I am finding I am getting problems with the link transmission interfering with the repeater rx The link antenna is a yagi 3 meters above the ground and the main repeater antenna is 6 meters above it .I am currently trying band pass cavity on the receiver rx or band pass/band reject diplexer with some success but I am wondering if the rf escaping from the cable is causing problems inside the repeater shed even at a low wattage .I am definitely changing the rg213u to either rg223u or lmr400 as it is only on the link radio and shouldn't have any effect on the repeater's operation .Has anyone else had the same sort of problem where the rf energy leaks out of the cable in the shed and causes problems to the repeater and they had to upgrade the link cable to 100% coverage cable   Thank You, Ian Wells, Kerinvale Comaudio, 3A Murchison Street,Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au http://www.kerinvalecomaudio.com.au
RE: [Repeater-Builder] Motorola Quantar programming help please?
Dave, There are two RSS instruction manuals that pertain to programming the Quantar/Quantro stations: 6881085E35 6881096E10 Both manuals are available from Motorola Parts for about US$ 32 each. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Dave Sent: Saturday, June 26, 2010 4:12 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Motorola Quantar programming help please? Hi All, There are some Motorola Quantar base stations to be bought out of service very soon in the UK and I was wondering if there is a programming manual available? Any help appreciated. Cheers Dave
RE: [Repeater-Builder] Motorola Mystery Box
Could it be a tapped delay line? Can you look inside without destroying it? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Scott Overstreet Sent: Friday, June 25, 2010 2:45 PM To: Repeater-Builder@yahoogroups.com Cc: Scott Overstreet Subject: [Repeater-Builder] Motorola Mystery Box Hello All-- I have a black metal box (about 2x3x7) here labeled : Motorola 1D83000E 209933 7109 Part # 80D103 Machine screw hold down studs on one side and a string of solder terminals on the other side labeled IN, 100,200,300-to 900, 50, 100 and OUT and a couple of GND's. What is it?---I don't know where I got it and I am mystified Thanks much, Scott
RE: [Repeater-Builder] Re: Motorola MTR-2000 Repeaters
I think notorious is an extreme exaggeration. I have eight MTR2000 repeaters in service, and they have been trouble-free. Moreover, I have never heard of such problems from other MTR2000 owners. Some early units had problems with a bad batch of a particular transistor, but that was corrected years ago. Let's have some hard data to back up this vague allegation! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of skipp025 Sent: Thursday, June 24, 2010 10:30 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Motorola MTR-2000 Repeaters tracomm trac...@... wrote: MTR-2000 repeaters are notorious for issues that require a power reset, less often with the latest version of firmware, but still require reset, there is a service bulletin on this. CJD Does the Service Bulletin provide a real world fix? ... or some type of work around? s.
RE: [Repeater-Builder] Astron RS50 Power Supply
The RS-50 schematic is here: www.repeater-builder.com/astron/pix/astron-rm50a-bb.jpg 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kevin valentino Sent: Sunday, June 20, 2010 12:17 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Astron RS50 Power Supply Those older? units actually have an out of phase tap on the Xfmr, 10v? or somethin! forget what color the leads are, can check. Believe it or not I have brought several of them back to life by just soaking the transformer in varnish and letting it dry of course! That feedback winding oscillates and vibrates the xfmr resulting in non(good) stabilization of the xfmr, vibrates for so long, actually loosen's the windings Now everyone is gonna say i am nuts! For the cost of a can of varnish, think you actually have to use polyurethane today, just try it! beats the cost of a new supply! And of course change all eletrolytics if it is the one wit h a gaint amount of 2N3055 (mpn)or equiv on the outs than i am totally correct! The ic is a national LM723. or just 732? working off old memory here as i now use switchers prob got the schematic for that rig somewhere. used them in a lot of bases in the day, before i got smart enough to swap them out Kevin- On Sun, 6/20/10, James ka2...@gmail.com wrote: From: James ka2...@gmail.com Subject: [Repeater-Builder] Astron RS50 Power Supply To: Repeater-Builder@yahoogroups.com Date: Sunday, June 20, 2010, 2:22 PM Hi Guys, I am trying to download a schematic on this site for the RS50M Power Supply and keep getting a 404 Error on each attempt on all the supplies. Any ideas? Also our above mentioned power supply which operates our 2 Meter and 440 Repeaters and a low power link started humming yesterday. A trip to the tower showed that the two large wires coming from the Pass Transistors to the post on top of the regulator board and into the 1000 Uf Electrolytic got so hot it melted the insulation an inch back on the wires, burned an area the size of a quarter on the fiter side of the regulator board, turned the terminal black on the Cap. and cracked the plastic on the cap. It never blew the fuse and a check of the voltage showed it regulating under load and hardly a trace of AC on the 13 volt output. The MOV or eight amp AC fuse never blew. All the equipment hooked to the supply took off and worked well on another supply. Anyone have a guess as to what caused this obvious surge ontop of the cap? I am going to replace the Cap. and one resistor on the regular board which is discolored and hope for the best. Any advise appreciated. Thanks in advance JIM KA2AJH Wellsville, N.Y.
RE: [Repeater-Builder] Astron RS50 Power Supply
Leroy, The problem is that the jumper wire or PCB trace- if it exists- will create a common and low-impedance connection between the AC and the DC sources in a station. This may not cause a problem for some systems, but is certainly not a recommended practice where DC power returns and signal common conductors are at similar potentials. It is a long-established practice in the power, broadcast, and communications industries that there should be only one connection where all signal and power grounds are brought together. For residential and commercial wiring, the National Electrical Code (NFPA 70) calls this point the service. The Code is very explicit that the service is where CATV coaxial shields, telephone line protectors, and the power neutral are joined. Likewise, most cellular and LMR stations follow such guidelines as the Motorola R56 Manual, which specifies a ground window where station grounds, power grounds, and feedline grounds are made common. To establish additional grounds at DC power supply returns is almost certain to create ground loops that will interfere with sensitive equipment and circuits. A case in point: My 6m repeater controller would lock up periodically, requiring a 60-mile round trip to the mountaintop site to reset the system. When these lockups occurred, both the primary receiver and the link receiver were deaf, and I lost control of the repeater. The cause was not apparent, since the lockups occurred in clear, mild weather with no obvious causes. On a hunch, I tested the Astron RS-35M power supply and discovered that the negative output terminal was jumpered to the chassis. I removed that jumper, and the problem went away-forever. My guess is that a surge from a nearby air-conditioning system was coupled into the grounding system, and the resulting spike on the DC return for the controller caused it to be corrupted. Another repeater that used an Astron power supply had a low-level 60 Hz hum on the audio that was audible only at base stations, which used larger speakers than portables or mobiles. After I did some head-scratching, I surmised that the hum was not a ripple from the power supply, since that would be 120 Hz in a power supply with a full-wave rectifier. This repeater had a gel-cell battery floating on the power supply output (with a Schottky blocking diode, of course), and I noticed that the hum stayed when I turned off the power supply. However, the hum went away when I unplugged the power supply. Aha! Once I removed the internal jumper connecting the negative terminal lug to the chassis, all was well. Astron is not consistent with these jumpers; some models of power supplies- both linear and switching- have them, but not all. IMHO, the station designer should decide where and how the system grounds should be connected, and not the manufacturer of a power supply. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Leroy A. M. Baptiste Sent: Sunday, June 20, 2010 3:28 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Astron RS50 Power Supply I must have missed it, but what is the deal of not connecting the negative side of an Astron Supply to case? -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Mike Morris Sent: Sunday, June 20, 2010 6:24 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Astron RS50 Power Supply At 11:22 AM 06/20/10, you wrote: Hi Guys, I am trying to download a schematic on this site for the RS50M Power Supply and keep getting a 404 Error on each attempt on all the supplies. Any ideas? Did you use the email link on the 404 page to tell the guys at repeater-builder? I just checked the RS50 links and they all seem to work... Let me know which link doesn't work and I'll fix it. You might want to read the repair and modification notes on the Introductory Information page. At the least you should add the missing compensation cap and the missing lock washers. Make sure the negative side of the supply is NOT connected to the case. Eric WB6FLY posted a informative note about that a while back. It's reproduced on the Introductory Information page. According to the schematic the main diodes in the RS-50 is the 1N1184A. International Rectifier calls it a 40 amp diode. What brand is in your unit? I rebuilt an RS50 a couple of years ago and used a pair of the 1N2129A (60 amp diode). If I were to do it over again I'd use a 100a diode like the 1N3288 that I use in the RS-70. Mike WA6ILQ
[Repeater-Builder] LBIs Needed for MLSII
If any reader of this list happens to have a clean and complete original hard paper copy of any of the following LBIs, and is willing to lend it or them to the RBTIP scanning team for reproduction, please contact me directly at mycall at verizon dot net. Your original will be returned after scanning. Thanks! GE MLSII Combo Service Manual Maintenance Manual: LBI-38421 GE MLSII Transmitter / Receiver Maintenance Manual: LBI-38422 GE MLSII System Control / Synthesizer Maintenance Manual: LBI-38423 GE MLSII Service Section Maintenance Manual: LBI-38425 You may notice that these LBIs are conspicuously absent from the Ericsson 2-CD LBI Index, and may be printed on unobtanium paper. Your help is appreciated! 73, Eric Lemmon WB6FLY
RE: [Repeater-Builder] SM-120 Assy. connection clarification
Jim, According to the SM-series Service Manual 6880903Z45, pin 7 of the accessory connector and pin 4 of the mike jack are ground. I verified this on a new radio just now. Confusion sometimes arises because of the way Motorola numbers the pins. When looking in at the accessory connector, with the radio upright, the pins are numbered thus: 15 13 11 97531 16 14 12 10 8642 When looking in at the mike jack, the wires are numbered thus: 8 7 6 5 4 3 2 1 The SM-series Service Manual is still available from Motorola Parts for about $22. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kh6...@netscape.net Sent: Sunday, June 13, 2010 11:29 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] SM-120 Assy. connection clarification With no power connected, on the Accessory connection in the back of the unit, which is Ground? Sm-120 reference information states that pin 7 is ground. On my unit, on the Accessory connection in the back of the unit, pin 4 is at ground. I have programmed the Accessory for pin 4 to be COR + PL., pin 9 PTT, pin 11 Rx audio , and pin 3 Tx audio. I noticed that the information on the SM-120 web page stated, in the front, the RJ-45 pin 4 is at ground. Could someone explain, or correct the Accessory connection. Thanks,73's, JimKh6jkg
RE: [Repeater-Builder] Re: MOVs for power supply primary
A Gas Tube Arrestor is better suited to telephone lines and RF coaxial cables than to 120 VAC AC power lines. If used on AC power lines, when fired, they will produce a bolted short and cause a great deal of current to flow. This is not a good thing! Some computer accessory suppliers vigorously market surge arrestors as a must-have accessory, and the American public is being brainwashed. In fact, most computer circuits do not benefit from surge arrestors, and some power strips that include surge arrestors are banned by many large companies as being prone to catch fire. The gray plastic, half-moon-shaped power strip made by APC is known to be a fire hazard, and my employer (Boeing) banned them after the second fire incident. In each incident, the MOV spontaneously overheated and melted the plastic case, which then caught fire. Fortunately, the damage was limited to the wooden shelf it was sitting on in one case, and some scorched carpet in the other. As a result of these two incidents, the CPSC recommended that any power strip be made of metal rather than plastic, and further, that the plug strip containing a surge suppression device always be placed upon a non-combustible surface. A word to the wise... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kq7dx Sent: Wednesday, June 09, 2010 11:43 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: MOVs for power supply primary Instead of MOVs, how about a gas discharge tube [GDT]. OR Possibly in parallel with the MOV. They are small and metal and the specs say they can take quite a few discharges and not break down.. Anyone use those? Thank you for all the replies and info on my subject!.. 73 --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Jeff DePolo j...@... wrote: Hmmm. That's a tougher one. Mostly I use the Polyphasers (PLDO-120US-15A or -20A) at sites that don't have facility-wide protection. The TrippLite Isobar Ultra series is another (ISOBAR8ULTRA et al). The Isobars also have a $50,000 equipment warranty (can't say I've ever had to use it, don't know how much red tape there is to go through). I like the Polyphasers because it's designed to mount to a ground panel/bus bar, so I mount it to the bus bar that has all of my other arrestors (coax, telco, etc.) on it to provide a common-point ground. The Isobar doesn't have provisions for direct grounding - it relies only on the equipment grounding conductor in the AC cord, but the TrippLite has arguably better EMI/RFI filtering than the Polyphaser. --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Tuesday, June 08, 2010 4:48 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] MOVs for power supply primary OK, I should have been more specific. What would be a reasonable unit for a repeater site that may have only a couple thousand dollars worth of equipment inside? Chuck WB2EDV - Original Message - From: Jeff DePolo j...@... mailto:jd0%40broadsci.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Tuesday, June 08, 2010 4:22 PM Subject: RE: [Repeater-Builder] MOVs for power supply primary Probably the ones I've had the most luck with are the Islatrol series from Control Concepts. I think they have been bought out by Emerson or Liebert or one of the other companies that have power divisions. Anyway, they call these active tracking filters. They not only are TVSS's but also filter noise, low-amplitude spikes, etc. Right now I'm typing from a mountaintop site (broadcast) that we re-built a few years ago. We put in an Islator I-2100 (120/240V single-phase). The old equipment shelter which had been here since 1990 had the same model unit. In the 15+ years we've been managing and maintaining the site, we've had zero surge-related failures, and this site sticks out like a sore thumb as far as lightning goes. In the last few years I've used the same series of arrestors for new site builds at a dozen sites or so and have had no power-related problems. Others that make comparable-quality products include Joslyn, Transtector, and Innovative Technologies. There is one big difference (to me anyway) between TVSS's, that being whether they are the series or parallel type. Series type takes the utility service (or transfer switch output if there's a generator too) as its input, and provides a protected output to feed
RE: [Repeater-Builder] MOVs for power supply primary
Chuck, Square D makes a line of heavy-duty, commercial-grade surge protectors for both 120/240 VAC residential and 208Y/120 VAC commercial systems: http://tinyurl.com/27tnma7 These are very good products, but- like any really good stuff- are definitely not cheap. I guess that one's definition of cheap changes after suffering a $5,000 loss due to a lightning strike! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Wednesday, June 09, 2010 5:51 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MOVs for power supply primary OK, I'm familiar with those single-point grounding panel protection devices. How about a service panel protector for home use? And a service panel protector for a small (200A) 3-phase panel? I ask, rather than simply Google for it, because Google could come up with some units that are not good. Chuck WB2EDVsnip snip
RE: [Repeater-Builder] MOVs for power supply primary
Two things leap out at me: Your generator has some very serious regulation problems, and may be undersized, and your Astron power supply must not have the correct fuse installed. If the MOV fires, the fuse is sized to blow instantly. That said, Astron has been known to install MOVs that have a wide tolerance, and those near the low end may go into avalanche mode at only a few volts above nominal 120 VAC. The national standard for nominal utilization voltage is 120 +/- 5%. That means the utility can supply anything between 114 and 126 VAC and be within the required tolerance. 126 VAC is darned close to 130 VAC, and that MOV is already getting hot! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of AA8K73 GMail Sent: Monday, June 07, 2010 6:47 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MOVs for power supply primary I added a 130 Volt MOV across the hot and neutral of an Astron 50 Amp power supply for a repeater and had an interesting effect. We lost AC power and switched over to the generator. When the load was added to the generator, the Onan's voltage sagged a bit and the throttle opened to bring the speed back. It overshot slightly and was high enough to trip the MOV. That short slowed the generator down until the voltage was too low and then the generator sped up again. And again it fired the MOV and slowed down until it cleared. It kept oscillating with huge voltage swings until I unplugged the Astron power supply. Sigh. kq7dx wrote: Hello to group, Is putting a MOV from hot to ground, neutral to ground, on the primary of the transformer of the power supply a good idea.. I have a ICE surge suppressor on in front as well but thought I would put more inside the supply for back up. Also, are the MOVs that radio shack sell any good. Rated at 130VAC. Any body used them... Last question: when MOVs fail or take a surge do they fail in a shorted condition taking out the fuse till the MOV can be replaced, or do they blow or fail open leaving the supply working. Thanks for the help.. 73s
RE: [Repeater-Builder] MOVs for power supply primary
Regarding your last question, an MOV normally will go into avalanche mode when the applied voltage exceeds its threshold value. It becomes a low shunt resistance, which should blow the input fuse in the device it is protecting. Once the voltage is removed and the MOV cools off, it usually recovers. However, usually is not always the case, so it may be prudent to replace all three MOVs after a surge event. As others have noted, an MOV rated at 130 VAC is suitable for a 120 VAC appliance only if its tolerance is tight, say +/- 2%. You won't find these at Radio Shack. It may be a good idea to install MOVs rated at 140 VAC with a 10% tolerance. Always protect the device with a fuse sized as recommended by the manufacturer, and don't substitute a fast-blow fuse for a time-delay fuse, or vice-versa. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kq7dx Sent: Monday, June 07, 2010 5:39 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MOVs for power supply primary Hello to group, Is putting an MOV from hot to ground, neutral to ground, on the primary of the transformer of the power supply a good idea? I have a ICE surge suppressor on in front as well but thought I would put more inside the supply for back up. Also, are the MOVs that radio shack sell any good? Rated at 130VAC. Any body used them? Last question: when MOVs fail or take a surge do they fail in a shorted condition taking out the fuse till the MOV can be replaced, or do they blow or fail open leaving the supply working? Thanks for the help.. 73s
RE: [Repeater-Builder] transmission is intermittent and voice cuts out with my mc-micro repeater
Check the deviation levels of your voice and the PL tone (if used), and verify that they are compatible with the repeater's receive bandpass. In some radios- Alinco and Icom are typical- the PL tone is way too high in deviation, and gets distorted when voice peaks push the total deviation into limiting. When that happens, the repeater receiver mutes when it can't detect a valid PL tone. This is called talk-off. One of the users of a local repeater has an unusually high-pitched voice, and the controller would occasionally mute the audio while he was speaking, thinking it was detecting a DTMF control tone. Does this problem occur with other users? If not, your own radio may be off-frequency, or over-deviating. It is also possible that your PL tone is weak or distorted, and the repeater's decoder can't maintain a good lock on it. Further investigation of this problem is needed. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of mimomeg Sent: Sunday, June 06, 2010 7:56 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] transmission is intermittent and voice cuts out with my mc-micro repeater Seem to have period where my transmission (voice) cuts out for a few seconds every so often, and the person at the other end can't hear me. On the receiving end,Does anyone have any idea? Thanks in advance
RE: [Repeater-Builder] GE Master Exec 50W Low Band 42-50 Splitt PA needed
Wayne, Please share with the Group the details of the failure. Was the PA properly modified to operate efficiently at 6m, or was it a stock 42-50 split PA? If not, at what power level was it being used? If the PA was unmodified and being operated well outside of its intended band, I guess the tried and true description means that it worked well- for a while- despite being misapplied! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Wayne Sent: Friday, June 04, 2010 7:06 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE Master Exec 50W Low Band 42-50 Splitt PA needed After years of operation our tried and true 6M repeater died. This repeater, in Arkansas, is located on the highest point between the Rocky Mountains and the Smokey Mountains and provided excellent coverage. We need a GE Master Exec. II Low Band 50 watt 42-50 split PA. The combination number on the front of the radio follows. The ? means it does not matter. RT64???33?? We only need the PA. If any one has one of these they want to part with let me know the details. Please reply by post to reply to sender or wa5luy at cablelynx dot com. Wayne, WA5LUY
RE: [Repeater-Builder] Low Band Micor PA
Tim, The more-or-less standard Micor low-band continuous-duty PA is rated at 100 watts, and came in four models: TLB1411 25-30 MHz TLB1412 30-36 MHz TLB1413 36-42 MHz TLB1414 42-50 MHz There are significant differences between these models, and they cannot be used very far out of their respective band limits. Which PA are you seeking? What is the complete model number of the VHF PA you have to trade? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301 Sent: Thursday, June 03, 2010 6:46 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Low Band Micor PA Hi Folks, Anybody have a Micor Low Band PA - Repeater/Base station type? Not sure if they came in lower power versions, but looking for a continuous duty. Will swap a VHF continuous duty for it. Looks like I'm getting some cans for the 6 mtr repeater will now be able to be at a single site, so want to put it all in a single box. Already have the RX, exciter, remote control chassis PS. Thanks, Tim W5FN
RE: [Repeater-Builder] Re: Heavy Duty Antenna question....
Doug, If your antenna is going to be subject to 100+ mph winds, it should be braced at the top, and possibly in the middle as well. Moreover, there's no way that any antenna that is supported only at the bottom will survive extended exposure to high winds and ice buildup. The answer may be to side-mount the antenna on a standoff, with an insulated top brace. If the antenna is constrained from waving in the wind, even a medium-duty antenna will stand up well to blustery winter weather. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 10:32 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Heavy Duty Antenna question Thanks for all the recommendations. Fired an email off to Scala, curious to see what they come back with. I read thru a few Scala datasheets... curious that they do not give wind loading with radial ice... and... just my .02 here... from the pictures in their catalog... those antennas sure don't look very durable to me... keep the recommendations coming - specific models would be quite helpful (especially at 440MHz) doug
RE: [Repeater-Builder] Astron switching supply for Battery Charger??
Jim, You're welcome! By definition, a float voltage cannot cook a battery, since it is the voltage that the battery manufacturer specifies for indefinite connection. This is what gel-cells used in alarm systems and emergency lights are charged to, and they are floated continuously, 24/7/365. Ironically, many low-voltage-cutoff devices consume power to operate, and so hasten the discharge of the battery. Such devices should be chosen with care, especially if an extended power outage is a very rare event. After all, if your repeater is at a shared commercial site, I don't think power restoration is going to take long. Most gel-cells can handle a few deep discharges will no lasting damage. While it's true that some repeater owners believe that a low-voltage cutoff is absolutely necessary, it's also true that many stations simply stop working when the input voltage drops below a certain level, and therefore comprise a built-in low-voltage cutoff!! I specify Schottky diodes for power switching, simply because they have very low forward voltage drop- usually around -.4 VDC. The power dissipated in such a diode is so small that no heat sink is normally needed. I usually mount the diode right on the output terminal of the power supply. I use a short piece of one inch wide, 1/4 inch thick copper bar to mount an International Rectifier #122NQ030R Schottky diode, which itself has a 1/4-20 terminal screw. Very rugged and very reliable. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kh6...@netscape.net Sent: Monday, May 31, 2010 11:52 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Astron switching supply for Battery Charger?? Eric, thanks for your email. What are your comments on a cut-off circuit to open the battery charger, when the battery is fully charged? I would not like to 'cook' the battery. What about a a low voltage circuit that opens the load, for long periods of no AC? I acquired the diodes from Astron, where is the best place to mount the diode/heat sinks? On the power supply or on a rack panel, with good wires from the terminals to the diode terminals. Thank you for your comments. 73's, Jim Kh6jkg. -Original Message- From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Mon, May 31, 2010 5:00 am Subject: RE: [Repeater-Builder] Astron switching supply for Battery Charger?? John, There's nothing about a switching power supply that might disqualify it for battery float service. However, you should isolate the output of any power supply from the battery with a Schottky diode, so that a failure within the power supply- or the firing of the crowbar SCR- will not impose a dead short on the battery. After determining the correct float voltage for your battery plant, say, 14.2 VDC, set the output voltage of the power supply slightly higher to account for the small forward voltage drop of the Schottky diode. The load should be connected directly to the battery, not to the power supply. I have several Astron switching power supplies in service, along with several similar units made by Duracomm and Samlex. They have all been extremely reliable, and the high switching frequency results in no perceptible buzz or ripple in the output. A decade ago, some switchers were poorly designed and radiated spurious signals into the HF bands, but none of the name-brand switchers produced today have that problem. In fact, Motorola uses Duracomm and Astec switching power supplies in most of its commercial repeater equipment. One thing to be aware of is that some Astron power supplies, both linear and switching, have an internal jumper that ties the negative output to chassis ground. This jumper must be removed to avoid some problems with ground loops and erratic controller functions. The presence of this jumper can be tested by measuring the DC resistance between the grounding prong of the AC power plug and the negative output terminal. If the resistance is above 10,000 ohms, you're good to go. Otherwise, you've got to get under the hood... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of ab6li Sent: Monday, May 31, 2010 7:31 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Astron switching supply for Battery Charger?? Hello to the group. Has anyone used an Astron SS series switching supply for a battery float charger? I have seen the info on using the standard Astrons but I like the efficiency of the switcher. Any comments? Thanks in advance. John ab6li
RE: [Repeater-Builder] Astron switching supply for Battery Charger??
John, There's nothing about a switching power supply that might disqualify it for battery float service. However, you should isolate the output of any power supply from the battery with a Schottky diode, so that a failure within the power supply- or the firing of the crowbar SCR- will not impose a dead short on the battery. After determining the correct float voltage for your battery plant, say, 14.2 VDC, set the output voltage of the power supply slightly higher to account for the small forward voltage drop of the Schottky diode. The load should be connected directly to the battery, not to the power supply. I have several Astron switching power supplies in service, along with several similar units made by Duracomm and Samlex. They have all been extremely reliable, and the high switching frequency results in no perceptible buzz or ripple in the output. A decade ago, some switchers were poorly designed and radiated spurious signals into the HF bands, but none of the name-brand switchers produced today have that problem. In fact, Motorola uses Duracomm and Astec switching power supplies in most of its commercial repeater equipment. One thing to be aware of is that some Astron power supplies, both linear and switching, have an internal jumper that ties the negative output to chassis ground. This jumper must be removed to avoid some problems with ground loops and erratic controller functions. The presence of this jumper can be tested by measuring the DC resistance between the grounding prong of the AC power plug and the negative output terminal. If the resistance is above 10,000 ohms, you're good to go. Otherwise, you've got to get under the hood... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of ab6li Sent: Monday, May 31, 2010 7:31 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Astron switching supply for Battery Charger?? Hello to the group. Has anyone used an Astron SS series switching supply for a battery float charger? I have seen the info on using the standard Astrons but I like the efficiency of the switcher. Any comments? Thanks in advance. John ab6li
RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer
Not really. I had not seen this in any of my older catalogs, and I wondered if in fact the unit was made by Decibel Products. Like many RF products, ferrite isolators in particular, the frequency range stated in a manufacturer's catalog refers to the capability to construct- which is not the same as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Mine don't have labels on them. Usually they were sold as part of an SP package that included the window filters, multicoupler, etc. I haven't tuned or swept this particular set, but from experience, the cavity resonance will tune over a wide swath, probably the full 406-512 MHz, but the loop lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer
Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
RE: [Repeater-Builder] GMRS Repeater ANT (UHF)
Robert, I put 50 watts and 0.3 uV at GMRS frequencies into my Comm Shop for Windows program, and it suggests that 73 dB of isolation is needed to avoid desense. This amount of isolation can be achieved with about 39 feet of vertical antenna separation or about 1020 feet of horizontal separation. Since you can use a typical mobile notch duplexer for this application, it hardly makes any sense to erect a tower so that you can run two antennas. Even so, you should elevate your antenna as much as possible if you expect to get any decent range. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Robert Boles Sent: Saturday, May 29, 2010 9:46 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] GMRS Repeater ANT (UHF) it is 50 watts out, its at my home , and no other repeater with miles of this location and i have the ant and hard line --- On Sat, 5/29/10, ZPO geekdownra...@gmail.com wrote: From: ZPO geekdownra...@gmail.com Subject: Re: [Repeater-Builder] GMRS Repeater ANT (UHF) To: Repeater-Builder@yahoogroups.com Date: Saturday, May 29, 2010, 9:18 PM Depends on the power level. What type of site will the repeater be located at? A duplexer is probably going to be cheaper than a 2nd antenna and 2nd run of superflex. 73-N5VFF/Brian On Sat, May 29, 2010 at 7:21 AM, Robert bobe...@yahoo.com http://us.mc802.mail.yahoo.com/mc/compose?to=bobeic2%40yahoo.com wrote: how much space is needed between the TX and RX ant and which type of cable to use ? Yahoo! Groups Links
RE: [Repeater-Builder] HT-1000
Douglas, According to the HT1000 Service Manual, the model number H01SDC9AA3BN breaks down as follows: H - Handheld Portable 01 - HT1000 Model S - 470-520 MHz D - 4.0 - 5.0 Watts RF Power C - Standard Controls, No Display 9 - Channel Spacing is Variable/Programmable A - Primary Operation is Conventional/Simplex A - Primary System Type is Conventional 3 - Feature Level is Limited Plus B - Version Letter is B N - Unique Model Variation is Standard Package Needless to say, your radio is not a good candidate for use at 70 cm. While it is possible to hack the RSS so that you can get the radio to accept 70 cm frequencies, it is quite another thing for the radio to function in the Amateur band with acceptable power and sensitivity, and without burning up the final. Moreover, there is nothing to tune inside the radio; there are significant differences within the radios for each band. Perhaps your best course of action is to sell your radio to someone who needs the S split, and buy an R split radio. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Douglas Sent: Tuesday, May 25, 2010 8:49 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] HT-1000 I have a question, maybe two on the Motorola HT-1000 portable radio. On the Repeater-Builder's information webpage that talks about how to decipher the model number example: H01SDC9AA3BN The forth digit/letter defines the working spectrum example S for the range 470-520mhz, R 438-482mhz, etc. I am talking obviously about the UHF model HT-1000 Jedi series radio here. My question is,are there model R out there and secondly, how easy or difficult to retune the S model if the range is outside the Amateur Radio arena? Many thanks guys. Yahoo! Groups Links
RE: [Repeater-Builder] White Noise on Micor TX
Has it been established whether the Micor station was originally built as a repeater, or is it a base station that has been converted into a repeater? A repeater station comes with a great deal of filter components added to the two interconnect boards, as well as extra shielding over the unified chassis shelves. A lot of strange things can happen if the shield plates are left off, or are not fastened with all screws. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Sunday, May 23, 2010 9:55 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com mailto:tsoliver%40tir.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
RE: [Repeater-Builder] Need source for UHF power module
Be careful about getting the proper replacement part. The basic M57729, without a suffix letter, is for 430-450 MHz. The M57729L is for 400-420 MHz, and the M57729H is for 450-470 MHz. There are other versions, with different suffixes, for other UHF bands. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Struebel Sent: Sunday, May 23, 2010 12:01 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Need source for UHF power module RF Parts in California lists the M57729 for $ 68 (US) http://www.rfparts.com/module_m.html#m57704el http://www.rfparts.com/module_m.html#m57704el Dave WB2FTX - Original Message - From: P Grant mailto:ei4hxperimen...@eircom.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 9:37 AM Subject: Re: [Repeater-Builder] Need source for UHF power module Hello Byron, The M57729 is a standard Motorola PA Slab. Yours is the Kenwood Part number, M57729h-01-P. The standard Motorola module will be available off the shelf,,, BUT,,, it will be priced @ $230.oo US. Any equivalent Motorola, or spurious part [30W UHF] will do the job, much cheaper,,, you can cross reference on any good RF Components web site in your area. You may source one from a scrap [ out of spec ] mobile PMR radio for $10.oo, if you know where to look ! 25 watt would be much cheaper and easier to find. Hope this is of some help. 73 from Ireland. Peter EI4HX ei4hxperimen...@eircom.net mailto:ei4hxperimen...@eircom.net - Original Message - From: x.tait.tech get real mailto:x.tait.t...@gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Saturday, May 22, 2010 10:34 PM Subject: Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@utahwisp.com mailto:hellewe...@utahwisp.com wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2891 - Release Date: 05/23/10 02:26:00
RE: [Repeater-Builder] White Noise on Micor TX
Larry, I know about MSR2000 and MSF5000 stations, but I've never heard of an MSF2000. Most stations that are built for simplex (base) operation lack the filtering that is standard in duplex (repeater) operation. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Sunday, May 23, 2010 1:35 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Would the same apply to an MSF2000 base station converted to a repeater? lh On Sun, May 23, 2010 at 1:10 PM, Eric Lemmon wb6...@verizon.net mailto:wb6...@verizon.net wrote: Has it been established whether the Micor station was originally built as a repeater, or is it a base station that has been converted into a repeater? A repeater station comes with a great deal of filter components added to the two interconnect boards, as well as extra shielding over the unified chassis shelves. A lot of strange things can happen if the shield plates are left off, or are not fastened with all screws. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Sunday, May 23, 2010 9:55 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com mailto:tsoliver%40tir.com mailto:tsoliver%40tir.com mailto:tsoliver%2540tir.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%2540yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
RE: [Repeater-Builder] Moto GR-1225
Many early models of the GR1225 desktop repeater were delivered with RG-58 cable in the internal duplexer harnesses, which led to desensing and lockup. The problem becomes worse if carrier squelch is used. I was able to cure that problem by fabricating new harnesses with RG400 double-shielded cable. What are your RX and TX frequencies, and how much power is coming out of the transmit connector? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of k6kusman Sent: Sunday, May 23, 2010 2:23 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Moto GR-1225 Hello all. I have a GR1225 that seems to work just fine except for one lil problem.. It will quite often stay keyed up after the signal or local mic is released. The only way to clear it is to shut it down and turn it back on.. Then it's good for like 10 sec's and does it again. It won't do it by itself but only after being keyed.. Any ideas?
RE: [Repeater-Builder] Lost 10 volts in a Master II UHF Repeater
Whenever you have a shorted component, such as a tantalum capacitor, the current drawn by that short might burn out a PC board trace before burning up the capacitor. If that happens, finding the original problem becomes much more difficult. Perhaps a better and safer tack would be to use a small current-limited power supply to energize the 10 volt buss, but with the current limit set to 1/4 ampere or so. Following Jeff's suggestion, start unplugging and/or disconnecting loads until the buss voltage jumps up to 10 volts. I don't know what current is normally drawn from the 10 volt regulator in a properly-operating station, but that value should be measured and recorded for future troubleshooting efforts. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Saturday, May 22, 2010 6:36 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Lost 10 volts in a Master II UHF Repeater I would look for a shorted tantalum capacitor hanging somewhere on the 10V rail. I agree. If you hook 10V from an outside source to the 10V buss, you'll probably find it's drawing all kinds of current. The 10V regulator circuit will go into fold back before burning up. This is by design. I usually hook a source of 10V at about 1.5A and look for smoke. It's usually one of the tantalum capacitors that starts to smoke. Once it's done smoking, problem solved!! Put a DMM on the 10V line, then start disconnecting things until you narrow it down, divide and conquer. Pull all of the cards out of the cage (except the 10V reg card obviously), disconnect the exciter, remove the receiver, etc. With a good ohmmeter that measures fractions of an ohm, you should be able to narrow it down further once you've found the suspect module/board. I have lost track of how many shorted tantalums I have had over the years. When they occur in the B+ of the high current PA supply, they simply burn up and th problem fixes itself. They make a cool purple smoke with lots of sparks when they flame out! --- Jeff WN3A
RE: [Repeater-Builder] UHF System Budget Example
Although the 60 foot building is certainly tempting to use as the repeater location, you should first ensure that there isn't a bunch of HVAC equipment on the roof. The sheet-metal ducting and enclosures of rooftop HVAC installations are often prolific sources of passive intermodulation interference. Since radio equipment cannot be installed in an elevator machine/control room, you should plan on putting the repeater in an area where you have a cable pathway to the antenna that does not use the elevator hoistway. You should be able to purchase a used GR1225 or similar UHF and narrow-band capable repeater for less than $1,000. A new basic UHF antenna, mount, and feedline might run around $600 or so. Simple four-channel UHF portable radios, such as the Motorola CP200, will run you around $300 each, and the programming software and cable will run another $500 or so. If I were to buy this system new, I would look at a Motorola CDR700 desktop repeater, with two CDM750 radios inside, for about $2,800. The HVN9025 programming software and RIBless cable will run another $400 or so. Simple, four-channel radios in the Professional line, such as the HT750 with a NiMH battery, will run around $400 each, and the RIBless programming cable costs about $200. The advantage of using these Motorola radios is that the repeater and the portables use exactly the same programming software. I urge you to NOT mix and match a bunch of used radios of various brands, since they may not have compatible reverse-burst squelch-tail elimination formats. If you buy your portables new, you have all fresh batteries of the same part number, the same chargers, and a warranty. Once you start mixing brands and models, the issue of programming software and cables becomes a headache. Finally, once you have put together a list of materials for your entire system, send that same list to every local radio shop and to big discount suppliers such as Houston Communications and Ameradio. In your cover letter to each potential vendor, ask each one to submit a single dollar figure to deliver all items on the list to your door, with all taxes and shipping charges included. No doubt, you will be astounded at the spread of the quotes! Make it clear that the vendor is not to make any changes, additions, or deletions. When I did this exercise several years ago for the purchase of an MTR2000 repeater, the spread of quotes was nearly $2,000- with the highest quote coming from one of the local shops. Caveat Emptor! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of rahwayflynn Sent: Friday, May 14, 2010 4:48 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] UHF System Budget Example I'm working with a relatively new non-profit that needs analog-only coverage over their 26 acre campus. Site is pancake flat, no hills. Anyone have a finance spreadsheet with the costs associated with a single-site UHF system build out? Even though much of the equipment will be used, the board likely will want to see the what new would cost. Side note: they have an existing 60 foot tall building to house the repeater, so the tower itself is covered.
RE: [Repeater-Builder] Motorola DC remote T1602BM
The manual that covers the T1602BM console is 6881015E50. It is still in print and available from Motorola Parts for about $9. Call 800-422-4210 to order. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kc7stw Sent: Monday, May 10, 2010 8:58 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Motorola DC remote T1602BM Looking for a manual for this DC remote. Thanks for any help. BTW: Plan is to use it with a MSR2000 repeater.
RE: [Repeater-Builder] Unidentified Micor Part
John, It is a VHF bandpass filter that is found in a Micor mobile or station radio. The TFD6102A filter is found in most commercial VHF radios, and has a bandpass of 150.8-174 MHz. The optional TFD6101A filter has a bandpass of 132-150.8 MHz. It is the TLD6102A filter that causes grief for those who want to move a commercial VHF Micor down to the 2m band. Kevin Custer describes this problem here: www.repeater-builder.com/micor/micorvhfbpf.html 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of La Rue Communications Sent: Tuesday, May 11, 2010 10:20 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Unidentified Micor Part Need some help here. I have a Micor Part (I think) and the Motorola Code does not bring up anything at all on Google. From my guidelines, I know that this is a VHF Filter/Duplexer Part. The code is TFD6102APR. Pic is attached; One side has Input and Output on the opposite side to its respective receptacle if anyone knows what this doohickey is, I'd really appreciate knowing. :) Thanks! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
RE: [Repeater-Builder] if you have a commercial licenses check it on the fcc site
Don, The first step is to go to the FCC's License Search page, here: http://wireless2.fcc.gov/UlsApp/UlsSearch/searchLicense.jsp By choosing from the drop-down menu, you can search by name, FRN, or callsign. If you search by name, all licenses issued to that name(s) will be listed. Do NOT check the exact match box. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Don Kupferschmidt Sent: Monday, May 10, 2010 9:26 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site Eric, The obvious question is: How did you find it?? Thanks for all you've done, Don, KD9PT - Original Message - From: Eric Lemmon mailto:wb6...@verizon.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Monday, May 10, 2010 7:55 PM Subject: RE: [Repeater-Builder] if you have a commercial licenses check it on the fcc site Don, Go here: http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=2109328 http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=2109328 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com ] On Behalf Of Don Kupferschmidt Sent: Monday, May 10, 2010 3:18 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site Doug, I finally found my commercial license but I don't know how to look up the GROL. How did you do it? Can you paste the link where this is? Then, where do you add that call sign to the FRN # TIA, Don, KD9PT - Original Message - From: Doug Bade mailto:k...@thebades.net mailto:kd8b%40thebades.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, March 29, 2010 2:35 PM Subject: RE: [Repeater-Builder] if you have a commercial licenses check it on the fcc site I just went and checked mine.. What you need to do if your GROL is not attached to your FRN is add it from inside your FRN login.. Look up the GROL first so you have the number, you can do an alpha search on your name, then add that callsign to your FRN .. Doug From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Don Kupferschmidt Sent: Monday, March 29, 2010 3:04 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site I have both amateur and commercial licenses with them. I'm having problems trying to access their database. I went to QRZ, looked up my license, then hyperlinked to the FCC web page from QRZ's listing. There I found my FRN number and inserted it onto the ULS license database for commercial licenses. It didn't find anything. Can someone tell me what I'm doing wrong? TIA, Don, KD9PT - Original Message - From: Joe mailto:k1ike_m...@snet.net mailto:k1ike_mail%40snet.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, March 29, 2010 8:26 AM Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site I finally found the link to the database, the FCC makes nothing easy. Here it is: http://wireless2.fcc.gov/UlsApp/UlsSearch/searchFrc.jsp;JSESSIONID_ULSSEARC http://wireless2.fcc.gov/UlsApp/UlsSearch/searchFrc.jsp
RE: [Repeater-Builder] if you have a commercial licenses check it on the fcc site
Don, Go here: http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=2109328 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Don Kupferschmidt Sent: Monday, May 10, 2010 3:18 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site Doug, I finally found my commercial license but I don't know how to look up the GROL. How did you do it? Can you paste the link where this is? Then, where do you add that call sign to the FRN # TIA, Don, KD9PT - Original Message - From: Doug Bade mailto:k...@thebades.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Monday, March 29, 2010 2:35 PM Subject: RE: [Repeater-Builder] if you have a commercial licenses check it on the fcc site I just went and checked mine.. What you need to do if your GROL is not attached to your FRN is add it from inside your FRN login.. Look up the GROL first so you have the number, you can do an alpha search on your name, then add that callsign to your FRN .. Doug From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Don Kupferschmidt Sent: Monday, March 29, 2010 3:04 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site I have both amateur and commercial licenses with them. I'm having problems trying to access their database. I went to QRZ, looked up my license, then hyperlinked to the FCC web page from QRZ's listing. There I found my FRN number and inserted it onto the ULS license database for commercial licenses. It didn't find anything. Can someone tell me what I'm doing wrong? TIA, Don, KD9PT - Original Message - From: Joe mailto:k1ike_m...@snet.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Monday, March 29, 2010 8:26 AM Subject: Re: [Repeater-Builder] if you have a commercial licenses check it on the fcc site I finally found the link to the database, the FCC makes nothing easy. Here it is: http://wireless2.fcc.gov/UlsApp/UlsSearch/searchFrc.jsp;JSESSIONID_ULSSEARC H=tvF3LwnPwJvK9fNV5tTvYBFhHq63rMp7GHRY7yLR3QWF27W6hF00 http://wireless2.fcc.gov/UlsApp/UlsSearch/searchFrc.jsp;JSESSIONID_ULSSEARC H=tvF3LwnPwJvK9fNV5tTvYBFhHq63rMp7GHRY7yLR3QWF27W6hF00 !-392727333!-1803037743 Only 152 characters to type, error free. Or use this: http://tinyurl.com/yzaby3r http://tinyurl.com/yzaby3r I'm in it, so I can now loose my paper copy worry free. 73, Joe, K1ike* * Fuggitaboutit wrote: many people dont realize that the fcc has never put your old grol (ie) on the new FCC data base that was started in the late 90s it seems that if you had a grol before 1998 or thereabouts ( the inception of the fcc online data base), then your license may not be in the database forget trying to get them to look up your paper license if you lose the paper license, you are out of luck and will have to retest you may be able to call them up and tell them your info from your copy these licenses are still classified as lifetime licenses check yours on line on their site just to make sure its in there you probably have checked the site for your amateur information don't be surprised if you think you have a valid commercial license and you discover there is no record of it on the fcc site
