[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] Where do the temp comp resistors from ICM go?
Thanks Eric. These are actually the compensating resistors that install next to the crystal socket. I found them eventually on the schematic. Different color dotted crystals (yellow, white, green, red) require different load resistors (10 ohm, 3.09k, 7.5k and 12.4k respectively). Tony On 08/29/2010 11:18 AM, Eric Lemmon wrote: 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-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of Tony KT9AC Sent: Sunday, August 29, 2010 8:56 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.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] Polyphaser Question
Remember the objective is not to take the brunt of a lightning strike, but to drain off any static that would attract that strike. Lightning is just a spark looking to close the gap, and if your antenna is closer to DC ground, it will find something closer to its potential (i.e. static charged) to hit. Any protection is better than nothing, and don't scrimp on buying the cheapest used protector. Its your equipment your protecting and potentially avoiding liability. I buy new Polyphasers for our site and sleep just fine. On 08/18/2010 08:56 AM, wd8chl wrote: On 8/17/2010 11:55 PM, Ray Brown wrote: 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 No. I would find the nearest copper pipe from either the in-house water system or the sprinkler system, and clamp to that (making sure you don't crimp the pipe!!!) using #6 or maybe #8 wire if it's REALLY close (less then 5') Again, not as good as a dedicated system, but MUCH better then nothing.
[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, 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] Digest Number 7357
I remember that too Ken! I miss SAROC! And for your SoCal types.. I remember seeing Dick McKay walking around the Sahara in Vegas, talking into a Motorola mic (with just the coil cord hanging down) and listening on '94. This was during SAROC in the 70's Ken _ Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_2
Re: [Repeater-Builder] Recording of mysterious noise
Try dropping PL on the tail. Could be a signal mixing with your repeater offset and allowing your PL to keep your repeater receiver open. For example: 442.000 transmit with 100Hz PL + 5Mhz signal = 447.000 with 100Hz PL. Doesn't matter if you use PL or DPL - it still loops back in, and ham or commercial - on UHF they both use 5Mhz split. I have a 1250Khz AM station 1 mile from my site and its 4th harmonic is 5Mhz. Probably mixing somewhere locally; less when its raining (rusty bolt theory). I run PL decode and CSQ encode to keep this from happening, or split the PL tones differently. Of course its probably not the AM stations' fault, but as Joe said its better than listening to it. Tony On 06/29/2010 06:21 AM, Joe wrote: It sounds like the squelch closes on your receiver when the signal drops, is that correct? If so, that would eliminate the possibility of the noise being the output of a repeater that has a tail timer. Can you detect any tail timer at all? If I were to make a guess, it sounds like a transmitter that is keying up with noise, such as an RF link for something, and noise on the link input is keying up the transmitter. Are you able to detect any PL tone in the noise that you hear? PL may give you a clue as to the source of the signal. Can you DF the signal? Is this in the ham band, or commercial freq? Does it happen more at certain times of the day? Is it weather related? A trick that I used was to set up a spectrum analyzer and watch 10-20Mhz at a time. I would listen to the noise and look for another signal that keys up at the same time. Very time consuming, but can be very effective. It's a crap shoot, but it beats just sitting and listening to the noise. Some ham rigs even offer a crude spectrum analyzer mode, such as my Yaesu VX7-R HT. I've used the VX7-R to look for signals with some success. (I had to read the manual to get the darn think out of the SA mode!) I used to do a lot of tracking down of interference. It helps to analyze what is not causing the noise and don't always focus on what you think it is. Eliminating what is not causing the interference many times helps you focus in on what is really causing it. Good luck and 73, Joe, K1ike On 6/29/2010 4:15 AM, gm7svk wrote: Hello, Loaded sample to files section. Has anyone encountered this sort of noise on a system or have a suggestion as to what might be generating it? Proving difficult to determine source. Thank you, Doug - GM7SVK
Re: [Repeater-Builder] Motorola radios and Zetron 37 controller
I think you mean M44GMC29C3AA's - tons for sale on eBay typically around $50 each. M = mobile 4 = 25-40W (20% duty cycle) 4 = 438-470 Mhz GMC = this series (actually German Maxtrac is where these came from) 2 = wideband deviation (5Khz, where a 0 would be 2.5Khz narrowband - not switchable, one or the other) 9 = expanded logic board - 16 channel typical, MDC1200, QCII, etc C = model revision AA = not used, just character filler Are you power cycling the radios or the Zetron? Tony On 06/22/2010 08:45 AM, Larry Horlick wrote: Is the Zetron that's locking up? I had a similar problem with a Zetron 45B. lh On Tue, Jun 22, 2010 at 5:53 AM, Joel ag...@cyberbest.com mailto:ag...@cyberbest.com wrote: We have 2 repeaters that are more or less the same. One is on 2 meters and the other is on 440. They both exhibit the same problem, they lockup after a while and then need to be power cycled. They ran for years without issue. We have the Instruction manual for the Zentron controller, but nothing on the radios. The 440 radios are Motorola M44GM29C3AA's back to back. That's the only model number on the radios. Does anyone have any information on them? A Google search shows 2 Chinese sites having them for sale on e-bay, that's it. Seems strange. Any information would be greatly appriciated, Joe Loucka -- AG4QC
Re: [Repeater-Builder] Motorola radios and Zetron 37 controller - additional
Sorry, and apologies for the extra email, just wanted the info to be complete. The 3 near the end is the range - 1=403-433, 2=not used, 3=438-470, 4=470-490, 5=490-512 Awesome radios. On 06/22/2010 09:59 AM, Tony KT9AC wrote: I think you mean M44GMC29C3AA's - tons for sale on eBay typically around $50 each. M = mobile 4 = 25-40W (20% duty cycle) 4 = 438-470 Mhz GMC = this series (actually German Maxtrac is where these came from) 2 = wideband deviation (5Khz, where a 0 would be 2.5Khz narrowband - not switchable, one or the other) 9 = expanded logic board - 16 channel typical, MDC1200, QCII, etc C = model revision AA = not used, just character filler Are you power cycling the radios or the Zetron? Tony On 06/22/2010 08:45 AM, Larry Horlick wrote: Is the Zetron that's locking up? I had a similar problem with a Zetron 45B. lh On Tue, Jun 22, 2010 at 5:53 AM, Joel ag...@cyberbest.com mailto:ag...@cyberbest.com wrote: We have 2 repeaters that are more or less the same. One is on 2 meters and the other is on 440. They both exhibit the same problem, they lockup after a while and then need to be power cycled. They ran for years without issue. We have the Instruction manual for the Zentron controller, but nothing on the radios. The 440 radios are Motorola M44GM29C3AA's back to back. That's the only model number on the radios. Does anyone have any information on them? A Google search shows 2 Chinese sites having them for sale on e-bay, that's it. Seems strange. Any information would be greatly appriciated, Joe Loucka -- AG4QC
[Repeater-Builder] For Sale: Micor RF Preamlifier
Found this in the shack while cleaning up. Someone out there might be interested. For Sale: Micor RF Preamplifier Model TLD8421B 132-150.8 MHz and one original cable. Also included is the parts list and instructions 68P81016E33-B. Price is $50.00 plus $12.00 USPS. Thanks. Tony, K3WX 301-421-9189 (Silver Spring, MD)
Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer
All is not lost Josh - I'm running Motorola T1507 which are 4-can pass-only cavities on my Micor. Actually pass-only are better for commercial sites since they will help keep out a lot of intermod on either side of how they are tuned. Pass-notch on the other hand will pass the tuned frequency, but do a poor job of everything else rejection (other than the notch of course). On 05/29/2010 08:27 PM, Josh wrote: Certainly not what I was expecting... Yeah, I bought one from 'that guy'. It's more than an untrained eye - he straight lied to me... said 'under these caps are where you'll tune the capacitors' - I should have popped one off and looked down the hole. Maybe he was clued in, maybe he wasnt - either way, that's what I bought. Dangit :P So if all I have are pass cavities what 'are' they good for ? Guess I've got to find another dupelxer. j --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com, Jeff DePolo j...@... wrote: Ok so here's what I've got (I think) http://www.n2ckh.com/FORSALE/REPEATERS/DUPLEXERS/DB4076/DSC02678.JPG Hamvention special, 4 cavities, appears to be a DB Products 4076 family unit. My bench tools: HP 8924c w/ Spec Analyzer and Tracking Generator. There was a guy at the Hamvention that had several sets of Decibel four-cavity window filters, selling for $50 each, which, to the untrained eye, would look like an older DB4076. As you said, there would be nothing in the hole where the capacitor would be in a regular DB4076. In essecence, what you have are just plain-jane pass cavities. As a second means of confirming that you do, in fact, have a window filter, is there an antenna tee, or are the four cavities cabled together in cascade? If the latter, then you probably have a window filter. And as a third means of confirming, is there is a label on the front? If not, was there any signs of a label having once been there? If not, then that's yet one more indication that it isn't a DB4076. Decibel made two varieties of pass cavities used in window filters in that era. One had adjustable loops (less common), the other had fixed loops. If your loop connectors have a rectangular chrome plate around them with insertion loss calibration marks, you have the less-common adjustable ones. If you just see four philips-head screws and no chromed plate around the connectors, then yours is not adjustable. If you have the adjustable type, you could probably use them as a pass-only duplexer, but with mediocre isolation, even with the insertion loss cranked up higher than you'd like. If you have the non-adjustable ones, they have very tight coupling, so you're not going to get the isolation you'd need for a repeater. Did I buy a piece of junkola? Teach me obie-wan. Not junk, but maybe not what you were expecting... --- Jeff WN3A
Re: [Repeater-Builder] Dow-Key Antenna relay - 12 volt DC coil
I'm pretty sure I have one here, but you will probably get many many replies from others to sell you one. Ciao, Tony, K3WX On May 12, 2010, at 10:45 AM, Fred Seamans wrote: I am looking for a Dow-Key antenna relay with a 12 VDC coil. If anyone has one, please contact me off net! Fred W5VAY
Re: [Repeater-Builder] Micor PL encoder modification (TLN5731A)
Would this still allow the reverse-burst to pass through, or just abruptly cut off? On 05/03/2010 12:14 PM, wd8chl wrote: On 5/3/2010 1:08 PM, Jeff DePolo wrote: I'm guessing I am not the first to want to do this... I want to use a UHF Micor for a link. I want to be able to stop the PL encode immediately when a user unkeys, but I want the controller to be able to hold the transmitter up (without PL tone) for sending IDs. There appears to be no PL on/off gate on the TLN5731A encoder. The only tone gate is Q703 which only gates the out of phase tone used for reverse burst. Other than using a mechanical relay to interrupt the encoder tone output, any suggestions? Thanks, Paul N1BUG Pin 701 on the board (base of Q704) is PL Inhibit - pull to ground to kill the encoder. --- Jeff WN3A Yeah-that's it! |cP
Re: [Repeater-Builder] IDEA? Re: Micor PL encoder modification (TLN5731A)
Jeff, Good explanation, especially the fluttery/noisy user signal. Would this general theory apply for factory Micor DPL boards as well? I might run my repeater using DPL since that is what I have available and its working fine. Tony On 05/03/2010 02:36 PM, Jeff DePolo wrote: I don't have a schematic in front of me, but if your plan is to key voltage to the board on/off, this won't work ideally because the vibrasender reed takes a little time to come up to speed. Since the repeater transmitter is still keyed long after a user unkeys, just muting the encoder seems like it would work fine all by itself. Whether the radio does or does not understand reverse-burst shouldn't matter. RB would mute the receiver quicker on radios that do understand RB, but unless your courtesy tone, ID's, etc. start to be played out very quickly (like within a few hundred ms) of a user unkeying, even radios looking for RB should mute before those ID's and CT's air. Also consider what happens if a user is noisy/ratty/fluttery into the repeater. As the COR briefly goes inactive during a fade, you're going be switching PL phases. This will tend to make the user sound even more choppy on listener's radios that are using PL decode. You'd be better off not having the phase change, and just having the PL drop out briefly without RB, and then recovering in-phase when COR goes active again - less chance of having the user radio mute intermittantly. --- 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 N1BUG Sent: Monday, May 03, 2010 3:18 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] IDEA? Re: Micor PL encoder modification (TLN5731A) My original plan was to let the transmitter PTT control the Micor encoder board as usual, but supply a valid user signal present logic input to abruptly stop the tone when there is no user signal present... thus allowing the controller to keep the transmitter keyed for IDs without PL tone. This would also kill the reverse burst capability. But wait! (this is a little complicated to explain) What if I divorced J401-2 from keyed filtered A+ on the exciter and instead used my valid user signal present logic to supply keyed filtered A+ to that pin? The controller PTT would control transmitter PTT as normal. Valid user signal logic would control the tone encoder. Suppose I then put a diode between the collector of Q707 and J401-4 (delayed keyed filtered A+) and used logic from the collector of Q707 (inverted) to pull Pin 701 low when Q707 shuts off. I think this would: 1) allow the controller to keep the transmitter keyed for *both* valid user signals and IDs by way of normal transmitter PTT 2) allow valid user signal logic to control the tone encoder in such a way that there would be no tone output unless there was a valid user signal... and allow the decoder to do reverse burst after loss of valid user signal, then abruptly kill the tone instead of reverting to normal tone. If anyone followed my poor description... are there flaws in my thinking? Perhaps I am over-engineering here? Paul No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.814 / Virus Database: 271.1.1/2842 - Release Date: 05/03/10 02:27:00
Re: [Repeater-Builder] Mitreks as UHF Repeaters?
Good question Paul. Remember the Mitrek RF decks are almost the same used in the MSR2000 repeater, and with their tuned helical front end make great receivers. For the transmitter however, I would not run it on its own. Also reducing the power output below 50-66% of rating might cause spurious issues. The best is to get a manual and bypass the PA, running driver power only. Then use an external amp to get your power up to where you need it. This is how every Micor, MSR, MSF repeater is designed. Motorola typically spec'd transmitters at 70.7% to get the best balance from the parts, and typically used multiple stages to get there (i.e. 200mW-2W-15W-50W). I recently picked up two 50W Mitrek Plus models that I will be using for linking duty, and will be bypassing the PA on those as well. At only 10 miles driver power only should work, but I have yet to complete that phase. Good luck on your project! You'll never know what duty cycle is needed during an event, so better to overprepare than worry. Tony On 04/26/2010 01:47 AM, Paul Plack wrote: After a few years on the sidelines, it looks as if I'm going to be jumping back into repeater ownership. I have a few nice pieces left from my last adventure, including a TX/RX duplexer and a loaded S-COM 7K, but I'm pondering choices in RF decks. This will be a local UHF machine designated as an asset for a emergency net in a suburban area, at a modest height, and the only RF device at its site. I have two Mitrek 30w UHF mobile radios, and am aware of their duty-cycle limitations, but would like to consider using them. They have channel elements, and I'm not averse to spending the money to have the elements redone properly. Looks like the pair will be 447.xx transmit / 442.xx receive. I have a couple specific questions about these radios... (1) If Mitreks are converted for full duplex, how well do they work? I'd like to have a complete, swappable RF setup, so trips to the site are short, and repairs can be done on my bench at home. (As opposed to requiring the two radios as separate receiver and transmitter.) (2) Would it be a reasonable pursuit to adapt a larger heatsink, and would that safely allow 100% duty cycle at 25-30 watts? (I'm philosophically opposed to fans which introduce the opportunity for a bearing to take the machine out of service.) (3) Any comments on the front ends? (4) I know these lack the sophistication of the Micor mobiles. Is the lack of a circulator a big deal in this application, at an isolated site with no other transmitters? (5) Was Motorola's quality in the Mitrek era still good enough to make a Mitrek preferred over, say, synthesized commercial transmitter boards from lesser manufacturers, but of more current vintage? All comments welcome. 73, Paul, AE4KR
Re: [Repeater-Builder] Repeater crystals available
I'll take the Micor elements. PM sent to Terry (hope it didn't get caught in a spam filter...) On 04/17/2010 02:58 PM, terry_wx3m wrote: I recently took 2 UHF machines off the air. I have for a Mastr II 1 5C on 442.050 and 1 EC on 447.050. These were custon built by Bomar crystal at a cost of $35 each plus shipping and are temp compensated. Send me $40 and and I will send them to you. Also for Micor, I have a KXN1052A on 443.050 TX and a KXN 1024A on 448.050 RX. These I receystalled myself with Bomar crystals. Same deal $40 and they are yours. I'd prefer paypal, but probably will wait for a money order if you ask nice. Terry wx3m.te...@gmail.com mailto:wx3m.terry%40gmail.com 301-722-0305
Re: [Repeater-Builder] Nice article on the Molotora Gontor
This was a typical U.S. Government specification. Were there any bids?? Tony, K3WX On Apr 1, 2010, at 10:56 AM, Jed Barton wrote: dare i ask the price of one of these radios. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Scott Zimmerman Sent: Thursday, April 01, 2010 8:47 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Nice article on the Molotora Gontor
Re: [Repeater-Builder] Re: Helper Instruments (Voltadder VA 502)
On Mar 24, 2010, at 11:06 PM, Gary Schafer wrote: Yes he did build some for a few years. They were never a big seller as the price was pretty high. They did work pretty well. It did not have a digital display, only analog meters. There were lights that showed what range it was on. You could read AC on one meter and DC on the other. Handy for some things. I kind of remember him playing around with an attenuator pad to go ahead of a service monitor. I don't remember the wattmeter part though. There was a guy in California making a 40 db power pad to use ahead of a service monitor. It was made during the Singer monitor era to go in front of it. It had a port for the transceiver and one for the signal generator and another for the receive input on the monitor. It worked pretty well. There may be a few floating around yet. Gary: The guy that marketed that 40 db power pad was actually a rep, a real character. I still have the data sheet and picture somewhere here in my library. He used to tell me his real money came from making and selling waders. BTW I do have the schematic and JPEG of the Cushman 40 db pad with the fuse inside. Should I send it to someone? Ciao, Tony, K3WX 73 Gary K4FMX While we're at it, what ever happened to the watt meter that fed a power pad like a termaline with an attenuated output? Was that talk, or did they ever do anything with that?
Re: [Repeater-Builder] GAW/Motorola Test equipment
From what I remember, Norman Gaw was an ex engineer of the Measurement Corp, Boonton, NJ or one of the other Boonton companies. I still might have some product info in my library (hello Gary Shafer remember them?). Do you need more light? Ciao, Tony, K3WX On Mar 23, 2010, at 4:10 PM, Dawn wrote: Does anyone know what the background of GAW was? There wasn't a shop that I worked in that didn't have one of the Sinad/Distortion analyzers or the two tone generator that also was sold under the Motorola name. IIRC, there was also a small power supply with a hair trigger current trip/disconnect for pagers and handhelds that also was rebadged as a Motorola TEK product. I've heard two stories. One was the Galvin family owned the product line and another was that it was a private venture by an employee and distributed through the Moto network. Can anyone shed any light on this and what other products they made? I don't believe that I've ever seen any of these units sold on E-bay or through private sales although they were pretty ubiquitous. From what I remember, the construction quality was similar to kit grade rather then a professionally assembled product. dwt Yahoo! Groups Links
[Repeater-Builder] (unknown)
RE: [Repeater-Builder] Versatone 71.9 Decode chip
Bill, Thanks. We have a 167.9 I can send you. I will try to scrounge a 100.0 Hz chip somewhere. If I find one, I will send it. 73, Tony, KG2BV --- On Mon, 3/1/10, Bill Hudson w6...@pacbell.net wrote: From: Bill Hudson w6...@pacbell.net Subject: RE: [Repeater-Builder] Versatone 71.9 Decode chip To: Repeater-Builder@yahoogroups.com Date: Monday, March 1, 2010, 10:17 PM I’ll check when I get home and if I have one I will send it to the address you have listed on QRZ. I usually have what folks are looking for – including reeds all the way back to TU255a Motorola reeds. I am in need (if anybody has 2 or 3) versatone 100.0 Hz. units. I am good in QRZ at W6CBS Bill From: Repeater-Builder@ yahoogroups. com [mailto: Repeater-Builder@ yahoogroups. com ] On Behalf Of kg2bv Sent: Monday, March 01, 2010 9:52 AM To: Repeater-Builder@ yahoogroups. com Subject: [Repeater-Builder] Versatone 71.9 Decode chip Does anyone know where I can get a Versatone 71.9 decode chip? Thanks, Tony, KG2BV No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2717 - Release Date: 03/01/10 11:34:00
[Repeater-Builder] Re: Motorola cabinet key wanted
Try Repeater-Builder key page http://www.repeater-builder.com/keyspage/keyspage-index.html
[Repeater-Builder] Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?
Hi everyone, A while ago I was troubleshooting a bad feedback or growl problem that was impacting a UHF repeater, of which the short term workaround was to not encode TX PL (PL or DPL would keep it locked until the signal dropped enough or timed out). In doing some more research, I found a 1250kHz AM station within a mile or two that changes pattern between day and night. The interference mentioned above would appear around drive times (like 5pm) so that had me chasing other sources. Still, it was puzzling that a 5Mhz signal could be causing the feedback (it didn't appear when doing normal receiver testing with a service monitor). The recent give away was that I could hear talking underneath my test signal (like a sports show). So, if we take the 1250Khz signal or 1.25Mhz x 4 = 5Mhz. I realize that the 4th harmonic of a 5KW broadcast station isn't very powerful, but being in its nearfield might be enough to cause a mix with the UHF transmit output. Does this make sense? This phenomenon can be duplicated with both a 450 and 440 repeater system - both with standard 5Mhz offsets. I don't think any sort of filtering would work since the mix happens in the air. Only by having split PL's can the lockup be prevented, and equipment was both MSF5000 and Micor systems, through correctly tuned duplexers. Thanks, Tony
Re: [Repeater-Builder] Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?
Thanks Jeff. The AM station has the same power both day and night, just goes from 2 towers to 4 to change the pattern. Rusty bolt or fence line etc seems the most likely. The problem does seem to disappear when its raining out, which helps verify this theory. It might be a needle in a haystack trying to find this, so maybe remoting the receiver might be the easiest. Thanks and I'll continue to investigate. I can try temporarily moving the frequencies apart about 100Khz and see if my 5Mhz theory holds water. Tony Jeff DePolo wrote: So, if we take the 1250Khz signal or 1.25Mhz x 4 = 5Mhz. I realize that the 4th harmonic of a 5KW broadcast station isn't very powerful Well...it *shouldn't* be very strong. It has to be attenuated 43 + 10 * log (Pwatts) as measured in the field (not at the transmitter output terminals). If you have access to a field intensity meter that covers up to 5 MHz, or a spectrum analyzer and a calibrated antenna, you can measure it yourself. AM stations that change power and/or pattern at night sometimes use a different transmitter between day and night depending on the power levels. Some stations also have pre-sunrise, post-sunset, or critical hours authorizations that are intermediate power levels between day and night power levels, or as an adjunct to daytime-only authorization. Bottom line - the 4th harmonic content may vary due to a combination of pattern, transmitter power output, or even different transmitters. but being in its nearfield might be enough to cause a mix with the UHF transmit output. Well, 1 or 2 miles isn't really near-field, but in any case, the field intensity may be relatively high depending on all of the other variables (power, pattern, etc.). Usually interference to VHF/UHF involving mixes with AM broadcast occur somewhere at or near the VHF/UHF site, not at the AM site. In some cases, the problem can actually be caused within the equipment on the ground rather than externally at the antenna or on the tower. If it's an in-the-cabinet mix, it could be caused by inadequate RF shielding. Before going on a wild good chase, I'd ensure that everything is properly RF-shielded, shielded cables are used for interconnects, grounding is good, all shields are in place, all mechanical connections (e.g. screws) are tight, no oxidizes or corroded connectors, etc. To rule out a lot of AM coming down the coax (which is fairly unlikely for most VHF/UHF antenna designs), install a high-pass filter. Even a shorted quarter-wave stub should give a fair amount of attenuation down in the MW range. If you have any in-line lightning protection (Polyphasers, et al), try removing them. But, more than likely, if in fact the AM station is the cause (either its fundamental or a harmonic), you have a passive intermodulation mix, the old rusty bolt problem. It could be in your antenna, on your tower, in your duplexer, in a corroded connector, who knows where. Divide and conquer is the only way to try to isolate it. --- Jeff WN3A Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Low voltage disconnect in Alberta winters and more
Folks I've been reading the low voltage disconnect thread with a great deal of interest. Thanks for the tips and suggestions. We're putting up a VHF repeater and two UHF link radios on a solar/wind power site.Given Alberta winters what would you folks suggest as a low voltage disconnect value to avoid the batteries freezing in winter? Which can hit -40 for a few days. Also we're thinking of having a backup power generator being a lawn mower motor hooked up to an auto style alternator and a rioughly eight or ten hour fuel tank.If the batteries get too low then we'll just attempt to get into the site, fire up that home made generator and walk away. We'll make sure it looks like a rusty piece of garbage so no one who wanders by is likely to steal it. Any comments? (Apparently the snow drifts can get quite bad so we might need to borrow a snowmobile for the last 400 yards or so.) We're thinking of putting the batteries in a chest freezer disguised by thin plywood so it just looks like a box. We're told by the site owner that a fridge looks way too much like trailer trash so disguising it with wood should work.I'm thinking we would put the charge controller in there for a little heat and the dump load in winter Are we nutz? Have I asked some stupid questions? Tony
Re: [Repeater-Builder] zetron 48b
Check and see if the DPL is either being presented or programmed as inverted. My TP-38 panel is opposite of what I tell it to do, even though PL's always work. On 1/29/2010 3:56 PM, plaimann wrote: i have a zetron 48b controller , running 2 motorola vhf sm50 mobiles via the acdcessory connectors. im having a problem with running a dpl. when i set the controller to dpl, it will key up with no audio , but if i add audio the ctcss light drops and the repeater drops. any ideas? i run 2 pl's regularly with no problems.
[Repeater-Builder] Comm-Spec TP38 with DPL option
Hi Everyone, Picked up a nice Comm-Spec TP-38 and it appears to have the DCTCSS (DPL) board and updated firmware. I don't have any documentation on it, nor can I find anything on the Repeater Builder site. I might contact Comm-Spec for a better manual if available since the scanned versions cut off the bottom line or two, plus page two of the schematic is missing. Does anyone have information on programming this differently than the stock instructions for PL? I'm guessing its just do the 01# then enter the code, but I haven't tried it yet. Thanks for any help. If I find out any new information I'll share it back to the group and site. Tony
Re: [Repeater-Builder] Re: Comm-Spec TP38 with DPL option
Hi Skip, Actually I went to Comm-Spec's site and they have a 6-page addendum for the TP-38. Here is the link: http://www.com-spec.com/insheet/tp38tos.pdf I should have checked there first before opening my mouth on Repeater-Builder...oh well. Thanks for looking for me. Tony skipp025 wrote: Hi Tony, If you can't easily find it on line... I have it in my files and could copy and fax or mail it to you. I could scan it but I haven't had time to configure and make my replacement digital pdf scanner work yet (waiting on software from HP). So as a last resort I have it available with a bit of time and work on my end. s. Tony KT9AC kt...@... wrote: Hi Everyone, Picked up a nice Comm-Spec TP-38 and it appears to have the DCTCSS (DPL) board and updated firmware. I don't have any documentation on it, nor can I find anything on the Repeater Builder site. I might contact Comm-Spec for a better manual if available since the scanned versions cut off the bottom line or two, plus page two of the schematic is missing. Does anyone have information on programming this differently than the stock instructions for PL? I'm guessing its just do the 01# then enter the code, but I haven't tried it yet. Thanks for any help. If I find out any new information I'll share it back to the group and site. Tony Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Henry Repeater Amp or TE Systems
On Dec 20, 2009, at 2:03 PM, James Adkins wrote: TPL I will never consider. We used their 300-W amps for low-band at work, they'd oscillate unless we put in a second TR Relay with a 50-ohm dummy load, then they'd burn up. Not to mention, the 100-w ones we had were very dirty if we ran them above 35w or so. One brand I considered was Crescend for UHF, they are rock solid. But, they don't make a 220 amp. Will check into Volcom, never heard of them. Before Crescent, the name was VOCOM, I believe. On Sun, Dec 20, 2009 at 11:09 AM, Maire-Radios maire- rad...@verizon.net wrote: we have used TE, Henry, Volcom and TPL. Volcom and TPL have great service TE got a 150 watt and UHF and no matter what we do to it only puts out 120 watts came with paper work that show tested at 134 watts on a 150 watt amp. Had no luck to get this corrected. Will never but a TE amp ever if it was at very low cost. go with a good brand spend a bit more but it works and works Volcom 1ST TPL 2nd John - Original Message - From: James Adkins To: repeater-builder Sent: Saturday, December 19, 2009 9:44 PM Subject: [Repeater-Builder] Henry Repeater Amp or TE Systems Okay all, looking for opinions. Our club is going to purchase a 220 amplifier and a 440 amplifier for our repeaters. For 220, we're looking at either the TE Systems 2210RAN or the Henry C100B10R For UHF, it's either the TE Systems 4412RA or the Henry C100D30R. We have a Henry C300C30R in use for about 3-1/2 years now (running it at 250w output) on our 6-meter repeater and had to send it in about 13 months into its life to have the finals replaced. No problems since, though. I was pleased with Henry's response to the problem. Even though it was out of warranty, they fixed it under warranty. Though the TE systems amplifiers have more output (150w vs 100w), I have concerns about their reliability. The local D* repeater has had a lot of problems with their VHF amplifier, and it's not very clean (of course, that could be the fault of the D* repeater transmitter, too!). What are your opinions, TE Systems vs Henry? -- James Adkins, KB0NHX Vice-President -- Nixa Amateur Radio Club, Inc. (KC0LUN) www.nixahams.net Southern Missouri Assistant Frequency Coordinator - Missouri Repeater Council www.missourirepeater.org The Nixa Amateur Radio Club - There is no charge for awesomeness! (Well, only $1.00 per month) -- James Adkins, KB0NHX Vice-President -- Nixa Amateur Radio Club, Inc. (KC0LUN) www.nixahams.net Southern Missouri Assistant Frequency Coordinator - Missouri Repeater Council www.missourirepeater.org The Nixa Amateur Radio Club - There is no charge for awesomeness! (Well, only $1.00 per month)
Re: [Repeater-Builder] Two Tone Generator
Hello Ted: Wonderful! When I receive it, I make a copy for Mike to post on the site. Let me know what the cost of copying and postage, so I can reimburse you for your trouble. BTW My son, Andrew graduated from Washington University in St. Louis years ago. That's why I'm broke. Good school, one of the best! Ciao, Tony, K3WX address: Tony Faiola, 17335 Donora Road, Silver Spring, MD 20905. On Dec 10, 2009, at 5:37 PM, Ted Bleiman K9MDM - MDM Radio wrote: i have it but it'll take da day to find it. and copy the thing send address Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 - Chicago ,IL 60631-0353 Phone 773. 631. 5130 From: Tony Faiola fai...@ieee.org To: Repeater Builder Repeater-Builder@yahoogroups.com Sent: Wed, December 9, 2009 9:24:14 PM Subject: [Repeater-Builder] Two Tone Generator Hello Guys: Anyone out there have a manual for the Automated Industrial Electronics Corp., Batesburg, S.C. Model 2TSG-1 Two Tone Generator? If so, will pay for copy and posting. Thanks. Tony, K3WX
[Repeater-Builder] Two Tone Generator
Hello Guys: Anyone out there have a manual for the Automated Industrial Electronics Corp., Batesburg, S.C. Model 2TSG-1 Two Tone Generator? If so, will pay for copy and posting. Thanks. Tony, K3WX
Re: [Repeater-Builder] Rolling Pipe Sound
Scott, You are not alone in this!! I too have been fighting a problem almost exactly like this - I've tried different PL tones on RX and TX and that seemed to keep it from self-oscillating. Seems to happen more when the weather is dry and I describe it as a growl sound. Happening on a MSF5000 at a commercial site. We too have numerous broadcast towers within 2 miles, and lots of Cellular/PCS antennas around. Mine is on UHF, yours appears to be high-band VHF (from the TKR-750 K2 note). I'm still working on a resolution, but again for now try either split tone or remove PL from the transmitter (CSQ). It would keep the repeater keyed up for several seconds, then drop signal and come back again (as long as the tail remained with PL output). I've also shortened the hang timer to 3 seconds to help. It wouldn't bring up the system unless someone kerchunked it, then it started. Tony, KT9AC offtracks1 wrote: Thanks for all the post and for the web site and group. It's been very helpful to me as I have been setting up my system. My repeater system is a Kenwood TKR-750 K2, Telwave TPRD-1556 duplexer set (6 cavities), A Telwave Isolator on the PA. Running 1/2 Heilax to a Andrew DB224E antenna. This a repeater at my home as I am on a small hill. The antenna is about 40 feet vertical and 60 feet horizontally from the repeater/office. It works very well but I have had intermod issue that rears its head now and then that sounds like rolling pipe or hollow sound. I am runing a PL on both TX and RX. This sound opens up the receiver even. So my tx pl is getting back into the system. I have hunted down many noise makers in the office that could have been helping out. One was the Linksys router. I am going to replace it anyway as it makes a ton of noise I found. Changing my network from 100 to 10 on the card speed also reduced the noise levels. Still I get the rolling pipe sound now and then and it leaves as fast as it shows up. If I use my other antenna a Diamond F22 also fed with 1/2 Heliax I also get the same result. I do use a preamp but it also seems to not change with or without it. I have even ran it so the receive antenna is alone and the transmit is the other (split). I still get the rolling pipes now and then. I do have a FM radio station on 92.1 about 4 miles from me that is known to have a sloppy signal. Could it be that this is mixing with my system and creating this? Looking at getting a DCI Band pass filter on the receiver side but I am not sure if that is just throwing more money at this project and not getting anywhere still. Just wanted to see if anyone had some ideas? Scott KB7DZR Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Rolling Pipe Sound
Scott, I also would second the reverse repeater theory. Years ago (many) we had a repeater in Western PA on 147.165 that would lock up with a Michigan repeater on 147.765 (both rightfully coordinated) and produce the pipe sound. In those days (1980s) everyone ran carrier squelch and we had some Lake Erie ducting once in a while. Its up to you, but was just a quick workaround that I started doing. Funny thing is I can get the growl when the system ran DPL and conditions are right...but its not the repeater since another temporary system I put in did the same thing. Sorry to hijack your note with my issue, but was hoping that there would be some commonality and we would both benefit. Thanks for the information on echoproducer, I might look into that. Tony offtracks1 wrote: Thanks for the quick reply The revers pair is a good point. I am in a remote area and did the full coordination but still we have had some odd ducting here as I am close to 9K mountains and I am at around 4K feet to start with. Tony I have not ran it without the tx pl. I have a few folks that like that including myself as I drop the tone before the TX, the controller is a ICS. But still for testing I may do that. I have echolink so I hook it up at night to the Ireland conference and set the system to listen only so I do not interfere with folks. Then with a program called echoproducer I can log each time the system gets kerchunched. sometimes its fine other times the log is big. Sorry I failed to put down its on 147.000 TX 147.600 RX. I have a repeater info page off of my weather station site. http://www.josephoregonweather.com/repeater.html http://www.josephoregonweather.com/repeater.html --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com, Tony KT9AC kt...@... wrote: Scott, You are not alone in this!! I too have been fighting a problem almost exactly like this - I've tried different PL tones on RX and TX and that seemed to keep it from self-oscillating. Seems to happen more when the weather is dry and I describe it as a growl sound. Happening on a MSF5000 at a commercial site. We too have numerous broadcast towers within 2 miles, and lots of Cellular/PCS antennas around. Mine is on UHF, yours appears to be high-band VHF (from the TKR-750 K2 note). I'm still working on a resolution, but again for now try either split tone or remove PL from the transmitter (CSQ). It would keep the repeater keyed up for several seconds, then drop signal and come back again (as long as the tail remained with PL output). I've also shortened the hang timer to 3 seconds to help. It wouldn't bring up the system unless someone kerchunked it, then it started. Tony, KT9AC Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Has anyone measured out-of-band rejection for a duplexer?
Hi Everyone, Without the benefit of a spectrum analyzer, I would like to find out how much rejection of out-of-band signals can be expected from a typical UHF duplexer. Have a MSF5000 on 452 that works fine with the T4084 duplexers (1500 style), but have a lot of VHF data and FM broadcast hash that is trying to make it in (the 45kW FM is about 400 yards away and the VHF data is almost 1/3 harmonic). Looking at the documentation, I can guess its about 20db per cavity (or can), but the graphs don't extend very far. So for a regular four-can duplexer I might be providing 40db of protection. I want to increase this, and plan on adding one or two more cans on the receive side, and a Sinclair preselector in-between the latter two to make up for the increased insertion loss. Just wondering if anyone ever tried/measured this, or had ideas about filtering out FM broadcast. Eric mentioned using a single 7 Sinclair cavity, but I'd like to see if I can use some spare 1500 bandpass/reject cavities first. I don't think a 1/4-wave stub will work with that much field strength prying open the MSF's front-end. Thanks, Tony
RE: [Repeater-Builder] Has anyone measured out-of-band rejection for a duplexer?
Gary, This is wonderful information! So the bottom line is for duplex operation, a pass/notch is needed to protect the rx and tx from each other, but for everything else a bandpass-only filter is the way to go. I like your idea of using the signal generator and receiver to make measurements. Also think you can generate the offending frequency and use the FM capture effect principal to know when you've reached the same signal level (to get at least a ballpark number). I often do baseline measurements (sig gen to rx), then connect up duplexers and record those final numbers. Converting the microvolts to dbm and subtracting the two give me an idea of how well my duplexers are preforming. Of course I had a local shop double check them, and I was pretty close. Some day I'll get better measurement equipment. For now simple tools and process theory are my best learning methods. I can make a crude graph to see how the overall system is working by using the sig gen and a tunable receiver (i.e. 10 or 50 Mhz steps from 50 to 500Mhz). Tony --- On Mon, 11/23/09, Gary Schafer gascha...@comcast.net wrote: From: Gary Schafer gascha...@comcast.net Subject: RE: [Repeater-Builder] Has anyone measured out-of-band rejection for a duplexer? To: Repeater-Builder@yahoogroups.com Date: Monday, November 23, 2009, 4:03 PM You can make the measurement with a signal generator and a tunable receiver that has some kind of indicator for signal strength. It doesn't even need to be calibrated. Connect the signal generator to the antenna port and the receiver to the receiver port of the duplexer. Be sure to disable the transmitter. Find a reference level with the signal generator on the operate frequency. Then tune the signal generator to the interested rejection frequency and find it with the receiver. Then note the signal generator level and increase its output to match the receive strength that you noted at the start. The difference between the two levels is the amount of rejection the filters are giving you at the frequency of interest. With a pass/reject duplexer you won't have a lot of off frequency rejection as there is not much of a pass band on that type of duplexer. There will be good pass band rejection in the space between tx and rx frequencies due to the overlap of the filter skirts but outside of either it is not much. For an added receiver filter, your pass/notch filters again will not do too much for you as far as pass band rejection goes. If you use them to reject a specific frequency, each can should give you about 30 db of notch rejection but you may have some degradation of the wanted frequency if it is far removed. And you will probably not be able to move the notch far enough such as the broadcast band. You may be able to convert the cans to pass cavities by changing the coupling loops. Then you can do the same measurement as described above to see how much rejection you will get. Also look at some pass band curves in the catalogs and you will see about how much rejection a pass cavity will give you at a given distance away from where it is tuned. 73 Gary K4FMX -Original Message- From: Repeater-Builder@ yahoogroups. com [mailto:Repeater- buil...@yahoogroups .com] On Behalf Of Tony KT9AC Sent: Monday, November 23, 2009 1:36 PM To: Repeater-Builder@ yahoogroups. com Subject: [Repeater-Builder] Has anyone measured out-of-band rejection for a duplexer? Hi Everyone, Without the benefit of a spectrum analyzer, I would like to find out how much rejection of out-of-band signals can be expected from a typical UHF duplexer. Have a MSF5000 on 452 that works fine with the T4084 duplexers (1500 style), but have a lot of VHF data and FM broadcast hash that is trying to make it in (the 45kW FM is about 400 yards away and the VHF data is almost 1/3 harmonic). Looking at the documentation, I can guess its about 20db per cavity (or can), but the graphs don't extend very far. So for a regular four-can duplexer I might be providing 40db of protection. I want to increase this, and plan on adding one or two more cans on the receive side, and a Sinclair preselector in-between the latter two to make up for the increased insertion loss. Just wondering if anyone ever tried/measured this, or had ideas about filtering out FM broadcast. Eric mentioned using a single 7 Sinclair cavity, but I'd like to see if I can use some spare 1500 bandpass/reject cavities first. I don't think a 1/4-wave stub will work with that much field strength prying open the MSF's front-end. Thanks, Tony - - -- Yahoo! Groups Links
[Repeater-Builder] Re: what pac-rt means
PAC-RT = Portable Area Communications - Repeater http://www.repeater-builder.com/motorola/manuals/PAC-RT-H13TTY3110A_68P81010C06-B.pdf Tony
Re: [Repeater-Builder] Help Identifying UHF Duplexer
Motorola T1504. Just tuned one last weekend and average 81dbm reject with probably 0.1uV pass loss. Good for 250W and 406-512. Lots of good documentation on the Repeater-Builder page: http://www.repeater-builder.com/motorola/t1500.html Good Luck. Bought my last set for around $140. Tony bbfmrf wrote: I have a 4 can duplexer that was removed from service. I presently have no use for this item, so I would like to sell it, unfortunately, there are no markings as to its origin. It may be a home brew, but I seem to remember Motorola selling something similar and I believe the model started with a T, but I cannot find any info. If anyone can supply me with some info on this duplexer, I would appreciate the help, and also if anyone is interested, I will accept offers. Pictures of the duplexer may be found in the Photo Section of this group in my album BBFMRF. They are the first 2 pictures labed AA UHFDuplxerFront and AA UHFDuplxerrear FYI The frequency markings on the repeater are correct and the unit should presently be tuned as marked. Replies may be posted to the group or sent directly to me at bbfmrf at yahoo.com Thanks for all your help.
Re: [Repeater-Builder] Maxtrac with no Tx PL
Accessory plug, there is an option to disable TX PL with a jumper or RSS option. f...@fitzharris.com wrote: Hi All, I have a Maxtrac with no Tx PL. I've checked the programming several times, even cloned another radio. I've tried both TPL and DPL. I've checked the Tx output on the service monitor and there just isn't any TPL/DPL there. Mic audio is there and deviating at the proper level. What else should I be looking at? Thanks, Sean
Re: [Repeater-Builder] Narrow(er) band FM
I have a GM300 narrowband mobile (M34GMC00D3A), how do I know when its programmed to do 12.5Khz? There is nothing in RSS to select, where the MTS2000 CPS allows unique modes for narrowband. Thanks, Tony Cort Buffington wrote: I said I'd report back XYL and I were out with the EX500s today. I copied the channel we normally use for simplex and changed nothing but made it a narrower channel. Results. Noise squelch seems sloppier (normally I use DPL or PL, so that really isn't to big of a deal), audio fidelity is reduced. We weren't far enough apart to really test range. I think the audio quality was still pretty good, but when do do ok, go back to channel 3 now... It's quite clear the narrow sounds quite noticeably better than the narrower. 73 DE N0MJS P.S. I also wonder about the frequency accuracy of radios going to the super-narrow band. I've looked at a lot of ham rigs on my service monitor. They are usually worse than the commercial radios in this area. Isn't that going to have a more pronounced effect? On Oct 3, 2009, at 4:22 PM, John Sehring wrote: I think it's worth repeating (no pun intended!): 0. In a narrower band FM system, with only the carrier present, you may well get a bit more ultimate quieting sensitivity (but not necessarily better SINAD) as the receiver's IF bandpass (selectivity) is narrower, letting less noise thru. However, the question is: how much of that slightly increased sensivity is actually useable? 1. Reducing FM deviation to less than about 5 kHz results in less power in the sidebands, which sidebands convey the intelligence (the carrier is just there to enable the usual demodulation (detection) process). As the detector needs the sideband energy, even granting (1) above, you'll have less recovered audio available. The signal's spectrum then begins to resemble that of an equivalently-modulated AM signal; the major difference is that with an FM signal, the carrier is 90 degrees out of phase with the sidebands, whereas with AM, carrier and sidebands are in phase. 2. Reducing FM deviation (and narrowing IF bandpass) allows more distortion in receivers at low (fringe) signal levels, so it's less able to deal with things like multipath propagation, AM noise, FM noise (yes, there is such a thing), and co-channel interference. Signal to noise ratio is thus reduced. 3. Squelch action becomes sloppier because the demodulated audio spectrum which is used for noise-operated squelch is quite a bit less when using narrower band FM. Rule of thumb for the squelch detector's bandpass: it extends from A) just above the voice audio band, say, 4 kHz, to B) about one-half the IF bandwidth. The latter is distinctly less, so the squelch sensing bandpass is less making squelch action less responsive. If you use an audio spectrum analyzer to look at a demodulated FM signal, you can see the spectral differences between 75 (FM broadcast), 25 (NTSC TV sound), 15, 5, and 2.5 kHz deviated signals, esp. as the signal strengths are reduced to zero. --John
Re: [Repeater-Builder] F M Schematic Digest, a collection of Motorola schematics.
Hello Wayne: I came across one also. Would you like another one?? Tony, K3WX On Sep 26, 2009, at 12:49 PM, Wayne wrote: Motorola collectors. I came across a copy of F M Schematic Digest by Sherman M Wolf. Publishing date unknown. This is an 11 x 17 inch booklet containing 136 pages of schematic diagrams representing much of the equipment manufactured by Motorola in the 1950 era. Included are alignment charts, crystal information, and even dynamotor information. Models covered are Motrac, Motran, Dispatcher, T-Power, Twin-V, Sensicon, Micro- Talkie, and much more. Looking at the pictures brings back a lot of memories. If anyone is interested in this book please contact me by reply to sender. Wayne , WA5LUY Yahoo! Groups Links
Re: [Repeater-Builder] Re: ATSC pilot frequencies for Sig.Gen. alignment
What about a local Trunked Simulcast system for a rough reference? They should be GPS aligned somehow. Al Wolfe wrote: Pity that the guy selling all this stuff is in China. I think I'll pass. Al, k9si Re: ATSC pilot frequencies for sig. gen. alignment Posted by: wb6ymh freebsd...@hotmail.com mailto:freebsdfan%40hotmail.com wb6ymh Date: Tue Sep 8, 2009 6:56 am ((PDT)) --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com, wb6ymh freebsd...@... wrote: Bob, you might consider picking up a rubidium frequency standard, they are $100 on ebay. In fact there's a $77 buy it now listing with free shipping at the moment: http://cgi.ebay.com/10MHZ-EFRATOM-LPRO-101-Rubidium-Frequency-Standard-DHL_W0QQitemZ270442620847QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef7a2e7af_trksid=p3286.c0.m14 http://cgi.ebay.com/10MHZ-EFRATOM-LPRO-101-Rubidium-Frequency-Standard-DHL_W0QQitemZ270442620847QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef7a2e7af_trksid=p3286.c0.m14 You'll need a heatsink and a 24 volts power supply. A GPS locked standard would be ultimate, but they are more like $300. 73's Skip WB6YMH I take it back, GPS standards have come WAY down in price since the last time I looked. Here's one for $120... hmmm... tempting... http://cgi.ebay.com/Thunderbolt-PRECISION-GPS-10mhz-FREQUENCY-TIME-Standard_W0QQitemZ180399458965QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2a00a54a95_trksid=p3286.c0.m14 http://cgi.ebay.com/Thunderbolt-PRECISION-GPS-10mhz-FREQUENCY-TIME-Standard_W0QQitemZ180399458965QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2a00a54a95_trksid=p3286.c0.m14 73's Skip WB6YMH
[Repeater-Builder] WTB: MSF5000 110W UHF Range 2 PA - TTE1754A
Good Morning, I am looking to upgrade my MSF5000 from a 40W to 110W UHF Range 2 (450-470). Would anyone have one available for sale or know where I can find one? Probably a TTE1754A from what I've been reading. Thanks, Tony, KT9AC
[Repeater-Builder] WTB: MSF5000 110W UHF Range 2 PA - TLE2512A - Corrected
Sorry, listed the wrong assembly. If anyone has one for sale or trade please let me know. Tony Tony KT9AC wrote: Good Morning, I am looking to upgrade my MSF5000 from a 40W to 110W UHF Range 2 (450-470). Would anyone have one available for sale or know where I can find one? Probably a TTE1754A from what I've been reading. Thanks, Tony, KT9AC inline: nc3=3
Re: [Repeater-Builder] Narrow Banding and VHF Low Band
Does anyone know if a MSF5000 converted to narrowband operation would be legal under Part 90 after 2013? Tony Gary wrote: Don't know where you got the below 512Mhz comment from (except perhaps a sloppy comment in a recent article printed in Urgent Communications) but here's what the R O really says; Earlier in this proceeding, the Commission took the following actions in order to bring about a timely transition to narrowband technology: (1) set January 1, 2013, as the deadline for Industrial/Business and Public Safety Radio Pool licensees in the 150-174 MHz and 421-512 MHz bands to either migrate to 12.5 kHz technology, or utilize a technology that achieves equivalent efficiency; (2) prohibited any applications for new systems using 25 kHz channels, or modification applications that expand the authorized contour of an existing 25 kHz station, effective January 1, 2011; (3) prohibited the manufacture and importation of any 150-174 MHz or 421-512 MHz band equipment capable of operating with only one voice path per 25 kHz of spectrum, i.e., equipment that includes a 25 kHz mode, beginning January 1, 2011; and (4) prohibited the certification of any equipment that includes a 25 kHz mode beginning January 1, 2011.2 Keep in mind this applies to Part 90 services and not Part 95 or 97 radio services. Gary -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 wmhpowell Sent: Monday, August 31, 2009 9:49 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Narrow Banding and VHF Low Band Help! The FCC rules on narrow-banding seem to be contradictory when it comes to determining if VHF low band must be converted to narrow band. On one hand, the FCC states that All below 512 MHz which implies VHF low but on the other they specifically mention VHF high and UHF, specifically NOT mentioning VHF low band. I need to come up with a specific reference from FCC docs either requiring or exempting VHF low from narrow banding requirements. Urban legend and I heard won't get the funding if VHF low must be narrow-banded - only something form the FCC can make the $$ flow. And, yes, I looked but found nothing definitive. Thanks, Bill - WB1GOT Yahoo! Groups Links
Re: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex
Is it ok to use Silver PL259's and nickel reducers (UG176)? Thanks to everyone on their input. Trying to connect a MSR2000 and T4084 duplexer set (both UHF connectors). Tony Chuck Kelsey wrote: I solder the reducer onto the heliax shield, then screw it in to the PL259 and finish the soldering - some through the PL259 holes that I have already enlarged, and the center pin last. Chuck - Original Message - From: Jeff DePolo j...@broadsci.com mailto:jd0%40broadsci.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Tuesday, September 01, 2009 12:14 PM Subject: RE: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex I drill a hole perpendicular to the axis of the cable through the RG59 reducer (in the smooth area above the threads) so you can get solder to flow into it, maybe that's what Chuck was referring to? For 3/8 Superflex, the OD of the cable shield is just a tad too big to screw into a PL-259 easily, so I take a drill bit and shave off the tips of the threads inside the PL-259 so the cable goes in easy, then solder on as you normally would. I never came up with a solution I liked for putting 1/2 Superflex connectors on a regular PL-259, so when I'm forced to use PL-259's I usually go with 1/4 or 3/8 'flex or buy a real Andrew connector. --- 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: Monday, August 31, 2009 5:27 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex I wasn't sure, but that rings a bell. I think I had to drill out the ones for RG58 because that's all I had on hand. You know how that goes ;-) Chuck WB2EDV - Original Message - From: larynl2 lar...@hotmail.com mailto:larynl%40hotmail.com mailto:larynl%40hotmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, August 31, 2009 5:22 PM Subject: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex Chuck, if you use a reducer made for RG59 (and RG8X?) there's no need to drill. Perfect fit. Laryn K8TVZ --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Chuck Kelsey wb2...@... wrote: I've used 1/4 superflex with PL259 reducer. Works fine. Seems like I had to drill the reducer, but that's easy anyway. Chuck WB2EDV No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.65/2323 - Release Date: 09/01/09 06:52:00 Yahoo! Groups Links
[Repeater-Builder] UHF Connectors for 1/2 Andrew Superflex
Hello Everyone, I need to make some short jumpers UHF-male to UHF-male and have a length of 1/2 Andrew Superflex on order (actually eBay). Can I use regular silver-teflon PL259's with this cable, similar to how 1/4 superflex is used with the reducer? I can't find UHF Male connectors for 1/2 superflex at Tessco. Thanks, Tony
Re: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex
Thanks Chris. So using 3/8 superflex and silver PL259 seems tight enough? Would be better than using silver connector and nickel reducer. Just trying to build two 3' jumpers to replace old RG9. How tight can you bend the 3/8? I might also need to rebuild a duplexer replacing old/missing RG142. Tony Chris Curtis wrote: 3/8 superflex works pretty good with regular pl-259. It screws right onto the jacket. Then solder the corrugated copper through the holes of the pl-259 I've used the 1/4 w/reducer as well. I also drilled the reducer to get all the way to the copper. Chris Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com mailto:Builder%40yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Monday, August 31, 2009 1:40 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex I've used 1/4 superflex with PL259 reducer. Works fine. Seems like I had to drill the reducer, but that's easy anyway. Chuck WB2EDV - Original Message - From: kt...@ameritech.net mailto:kt9ac%40ameritech.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Monday, August 31, 2009 2:23 PM Subject: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex Jim, Thank you VERY much for trying this and letting me know. That will save me a lot of time with this project. I have read an article that uses 1/4 superflex with PL259 and UG176 reducers, and will order some new cables and connectors for the jumpers I need. Superflex is cheaper than RG214 and probably better shielded. Tony --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com, Jim Cicirello ka2...@... wrote: Tony, I just took a piece of ½ Superflex that previously had a connector on it and tried to place a PL259 UHF MALE on it. The corrugation on the superflex is larger than the ID of the connector. The connector will go over the center dielectric but the copper corrugation on the superflex is slightly larger than the outside of the UHF Male. The only way I can see it may be possible to join the connector to the cable would be to have a sleeve extend over the superflex and the outside of the UHF connector and then solder the sleeve. This might not be as good of an idea as getting proper connectors that fit the superflex like the N Male and use an adapter to get to UHF. Good Luck JIM KA2AJH From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of Tony KT9AC Sent: Monday, August 31, 2009 12:51 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] UHF Connectors for 1/2 Andrew Superflex Hello Everyone, I need to make some short jumpers UHF-male to UHF-male and have a length of 1/2 Andrew Superflex on order (actually eBay). Can I use regular silver-teflon PL259's with this cable, similar to how 1/4 superflex is used with the reducer? I can't find UHF Male connectors for 1/2 superflex at Tessco. Thanks, Tony Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.67/2326 - Release Date: 08/31/09 05:50:00
Re: [Repeater-Builder] replacing PA 30w by 100w VHF - MSR2000
Francois, I have a 100W MSR2000 UHF and all the adjustments are in the PA itself (intermittent unit). 400mW out of the exciter drives it, with no feedback. My suggestion would be to look at the schematic and rig up your own feedback circuit with a variable resistor. I'm not familiar with the 30W version, but it sounds like if the circuit is open to fail downward to zero output to protect the equipment. Tony va2rc_2000 wrote: Hello to all, we are using In Quebec City a VHF MSR2000 30 watts repeater. We are planning to install a new PA 100 watts. One question we have, on the 30w version there is cable going from the PA to the Exciter. On the PA 100w version, this cable does not exist, so the Exciter does not receive the current from the PA and we have no output. Can somebody help with this issue ? Thank you Francois VA2RC
Re: [Repeater-Builder] isolation
Other than ordering the software, is there an old-school formula that can be used for this? I been using the decibel-wheel to convert from microvolts to dbm. NORM KNAPP wrote: H How about a mastr ii pll Vhf 147.225/147.825 with db224a @ 270' with 300' ldf7-50a and 110watts. I am running 45 watts right now. Thanks De N5NPO Norm - 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: Sat Aug 22 10:22:36 2009 Subject: RE: [Repeater-Builder] isolation My CommShop calculates 99.65 dB is required. I'd definitely be looking at a six-cavity BpBr duplexer for this station. 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 kj4si Sent: Saturday, August 22, 2009 6:55 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] isolation Hope someone may have a program,commshop? What I need to know is what amount of isolation with duplexers that is required for a GE m2 receiver with .1...@12db and a m2 pll exciter,100 watt PA on vhf,600kc split?1/2in helix,with 4pole db224 antenna at 70 ft. thanks kj4si
[Repeater-Builder] Angle Linear Custom Preamp/Filter Unit
Has anyone used Angle Linear's custom preamp/filter repeater unit? I'm interested in learning whether real world performance matches what is said on paper by the vendor. Thanks.
[Repeater-Builder] RE: Johnson CR1010 receiver tuning issues
James I retuning 3 CR1010 a few months ago from 460.XXX to 444.XXX. The slugs only had a thread or two left in some cases. They were very sharp and required slow attention to detail. No mods were necessary. I'm still looking for a wiring harness cable as one repeater only had the modules. Tony In a message dated 8/13/2009 11:55:26 P.M. Eastern Daylight Time, Repeater-Builder@yahoogroups.com writes: Johnson CR1010 receiver tuning issues http://groups.yahoo.com/group/Repeater-Builder/message/93275;_ylc=X3oDMTJxNmw5cm4zBF9TAzk3MzU5NzE1BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDOTMyNzUEc2VjA2Rtc2cEc2xrA3Ztc2cEc3RpbWUDMTI1MDIyMjEwMw-- Posted by: n0qzv_jhorn jah...@mahaska.org jah...@mahaska.org?subject=%20re%3ajohnson%20cr1010%20receiver%20tuning%20issues n0qzv_jhorn http://profiles.yahoo.com/n0qzv_jhorn Thu Aug 13, 2009 9:21 am (PDT) I am having difficulty tuning a Johnson CR1010 receiver that I have crystaled for 448.975. I was able to get it to tune to the original frequency of 466.xxx without any problem. I was wondering if there is a mod that needs to be done to get it down that low. thank you James N0QZV
[Repeater-Builder] Duplexer tuning question w/service monitor
Hi Everyone, I was helping a friend tune a Motorola T1502 duplexer yesterday, and got the following readings using a service monitor and GM300 receiver. I just want to confirm that what I did looks reasonable as I did tweak one of the band-reject loops since observing a low reading. The repeater is playing well with no desense detected. Readings below are just general noise levels keeping the squelch open. RX Pair: High-side pass 457.000 = 0.4uV High-side reject 452.000 = 500uV TX Pair: Low-side pass 452.000 = 0.4uV Low-side reject 457.000 = 30uV The 30uV initially looked bad, so I played with the coupling loop on one can only (the 1502 is a four square can design) which raised the low-side reject 457.125 to around 300uV. This put the loop near the outermost position, but I was able to keep it fairly tight while making adjustments. I know that a tracking generator is the best way to tune duplexers, but having the service monitor/receiver should be acceptable. With 85 watts into the cans, we're getting around 55 out. The cans are spec'd at 1.5dB insertion loss which seems consistent with these readings. I might try and find another set of similiar cans or Wacom 678's for this site, if nothing to have a spare set. Thanks in advance for the feedback. Tony
Re: [Repeater-Builder] Getting mice out of a repeater sight
What no ants! Tony, K3WX On Jul 28, 2009, at 4:19 PM, Jed Barton wrote: Hey guys, I am sure many of you have been through this before. The evil mice decided to waunder in to my repeater sight. Up until now they avoided my repeater, but when I went up there, I was less than pleased. They didn't chew any wires thank god, but they walked across the top of the icom rp4020, and left some presents if you know what I mean. I need some input, what's the best way to clean it up, anything in particular? All the covers were on, so I don't think they got inside, but haven't pulled the cover off yet. Any ideas? Thanks, Jed Yahoo! Groups Links
[Repeater-Builder] Repeater Antenna Recommendations?
I'm giving serious consideration to replacing my 17-year old Radio Frequency Systems (Celwave) 1151, 8db Station Master type antenna with a brand new colinear or exposed dipole model. The antenna is being used for a 70 cm repeater. Any recommendations? Should I just buy a new 1151, or are there manufacturers/models more suited to repeater use (e.g., low noise, more durable, etc.). I chose an 1151 over a 455 (10db model) because I heard the the longer model flexes too much in the wind. Comments? Thanks. Tony
[Repeater-Builder] Service Monitor Question
Hi Everyone, I'm thinking about buying a used service monitor for various projects, and I've come across a few units that look good (from a price point) but I can't find any data on them. 1) Racal Dana 6113G Digital Radio Test Set Service Monitor 2) Cushman CE-4000 3) HP 8924C 4) Ramsey COM3 I realize these are NOT the preferred field service units (I like IFR myself), but for now I just want something usable here and there. Opinions on them are welcome or pros/cons. Thanks! Tony
Re: [Repeater-Builder] Mobile antenna mounting options - old reference
Funny, I was just looking at this on Friday! Makes my 1/4 trunk-mount seem less effective! http://www.larsen-antennas.com/docfiles/ASB9/Mobile/MobileSeriesDesignations.pdf Daron Wilson wrote: There was an awesome pictorial in the back of some two way manual, I'm thinking back to the Micor or Exec era. It was a study with results showing what the loss of various mobile mounting solutions were with respect to the center of the roof location used for reference. Anyone have a scan of this?
Re: [Repeater-Builder] Quantar band limits
Since you're going above frequency specs, is the Quantar anything like a MSF5000 where you need to adjust a VCO to cover the new range? Greg wrote: Hi everyone, I have a Motorola Quantar on the bench at the moment and I am having a slight issue with the programming of the unit. I have programmed plenty of these for public safety but this one is for amateur use on 70cm. The receiver, PA and exciter are all for UHF R1 (403-433Mhz) but the frequencies that need programming are: RX - 433.175 TX - 438.175 These are the base TX/RX values. When I program the codeplug in, I obviously get RX and TX errors showing up. Is there any way to trick the base into going a bit out of band to clear the errors? Normally I would just swap out the modules for the correct split and be done with it but this unit is a donation to the club and money for replacement modules isnt easy to come by. Thanks Greg
Re: [Repeater-Builder] Mastr II synthesizer
Hello Brian: I have a GLB synthesizer with the complet original manual in working condition when I took it out of the car. when I took it out of the car, it was wrapped with clear plastic, and tucked away. Never thought about selling it, but maybe it is worth $30.00 (plus shipping). If you have any questions, let me know, and I'll check the manual. I'm the original owner, and built it from their kit. It might be cheaper than buying crystals. Ciao, Tony, K3WX On May 26, 2009, at 1:15 PM, Brian Gieryk wrote: Individual Email | Traditional
[Repeater-Builder] Mobile Antenna
Hello: I presently have a dual band 2 and 70 cm antenna on the rear trunk deck of my car. In addition to this dual band antenna, I have a 900 MHz antenna a few feet away from it. Is there a dual 220 and 900 MHz mobile antenna on the market, or do I need to build one. If the latter, has anyone done it or have construction info on it? There is a 2M/220/440 mobile antenna available from Comet and Diamond, but I would like to have the two separate dual banders. Ciao, Tony, K3WX
Re: [Repeater-Builder] 900 Mhz Issue
Your call for help has been received. I looked and found two complete Series 8000 Radio/Microwave Links and MUX equipment manuals (big thick) plus additional separate manuals for 8200 Power supplies, 8110 RF Receiver,8010 RF transmitter, 8005/8006 Mini-Rack, 800Radio/Mux,8500 MUX modem, and 8590 Baseband Amplifier. All in excellent condx, ready for you to get it on the air. Ciao, Tony, K3WX On Jan 14, 2009, at 1:00 PM, Com/Rad Inc wrote: Here is a call for help Do any of you have information on: ISC Cardion product? We are seeking tech info on 8000 sereis rack radio station with the following modules/assemblies: 8010 Exciter 8251 PA 8111 Receiver 8210-002 Power supply 8301H Service module Any info especially on the PS would be cool. Ed K9QPJ
Re: [Repeater-Builder] 900 Mhz Issue
I think I have the manuals and sales literature on their equipment. Let me know if you don't get the info, and I'll look for it in my files. Ciao, Tony, K3WX On Jan 14, 2009, at 1:00 PM, Com/Rad Inc wrote: Here is a call for help Do any of you have information on: ISC Cardion product? We are seeking tech info on 8000 sereis rack radio station with the following modules/assemblies: 8010 Exciter 8251 PA 8111 Receiver 8210-002 Power supply 8301H Service module Any info especially on the PS would be cool. Ed K9QPJ
RE: [Repeater-Builder] mastr II question. . . IFAS Board
With that said. . . Here is my main problem and question. . . A # of years ago local radio club purchased 3 complete repeater stations. . . Have one converted working fine with no known issues other than it doesn't get used as much as I'd like folks to use it ;) The other two stations one had issues on fire up, other appeared functional (best as could be told since the units didn't have TX/RX elements in them and couldn't bench on original freq and had to tune exciter/receiver to high band elements I have. Have since rerocked onto a ham freq 147.045TX/147.645RX and have been experiencing many problems since. (After looking over everything with a local tech who spends his former life working on Lowband and UHF Mastr II's--20+ years) stated to check IF Alignment (weird things happening when audio hit certain levels and such which matched a lot in the GE IF alignment docs I found on Repeater Builder stating IF Alignment issues) After looking at other working base with the IF alignment test setup (o'scope looking at wave forms) it was apparent that this base was definitely out of alignment. Still having some issues where I can't get the audio level up to the 1 V RMS @ P904-11 and P904-17 as outlined in the alignment docs. (I can get 1V RMS but wave form coming out of there into repeater controller is clipping as it is over driven. . . When set for not clipping with 1KC tone @ 3KC deviation audio level is about .6-.7 V RMS) Main reason for needing schematic is to follow and see if any thingis weak in audio path thru everything and couldn't follow audio thru IFAS board as schematics didn't match up. My next question is what does R622 on the board (IFAS 19D432667G1 Rev A) do? Can't find it in text write up or details on RX Alignment. . . Now for interesting thing schematic lists R622 as being in REV B and later boards not REV A boards. Looks too good of a solder job and such to be anything other than factory so either this board is mislabeled for REV #'s or was one of the first boards to have R622 put in it before official REV B designation assigned. (Reason is this board had both pots R622 and R608 totally at one of the stops-full CCW--along with other adjustments at one end or the other before I started with it) At this point everything is working in this repeater and working close to where it should be as audio levels just aren't up to snuff and a little on the weak side. . . . (will trace audio on next trip to the mountain and go from there) Thanks all Tony, KA3VOR -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of John Transue Sent: Saturday, January 03, 2009 10:06 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] mastr II question. . . Eric, You're AMAZING!! I'm glad you are watching the list. John -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Friday, January 02, 2009 9:02 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] mastr II question. . . Tony, The 19D432667G1 IFAS board is covered in LBI-4986R, here: www.repeater-builder.com/ge/lbi-library/lbi-4986r.pdf 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony Alviar (Home) Sent: Friday, January 02, 2009 5:19 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] mastr II question. . . OK not sure if this goes here or on the Mastr II and/or GE list figured I'd try here first though. . . . Have a Mastr II continuous duty high band repeater station (factory GE repeater) Looking for LBI # that covers IF/audio/squelch board p/n 19D432667G1 REV A most of this board matches the schematic in lbi-38507e however, this particular board has a large transformer near the transistors that mount on the heat sink and has two transistors versus one shown in lbi-38507e Any help would be appreciated. . . . If anyone has a copy of that particular LBI a copy would be appreciated. . . Thanks Tony, KA3VOR Yahoo! Groups Links __ NOD32 3733 (20090102) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com Yahoo! Groups Links
RE: [Repeater-Builder] mastr II question. . . IFAS Board--correction
See omission below -Original Message- From: Tony Alviar (Home) [mailto:talv...@worldnet.att.net] Sent: Saturday, January 03, 2009 11:07 AM To: 'Repeater-Builder@yahoogroups.com' Subject: RE: [Repeater-Builder] mastr II question. . . IFAS Board With that said. . . Here is my main problem and question. . . A # of years ago local radio club purchased 3 complete repeater stations. . . Have one converted working fine with no known issues other than it doesn't get used as much as I'd like folks to use it ;) The other two stations one had issues on fire up, other appeared functional (best as could be told since the units didn't have TX/RX elements in them and couldn't bench on original freq and had to tune exciter/receiver to high band elements I have. Have since rerocked onto a ham freq 147.045TX/147.645RX and have been experiencing many problems since. (After looking over everything with a local tech who spends his former life working on Lowband and UHF Mastr II's--20+ years) stated to check IF Alignment (weird things happening when audio hit certain levels and such which matched a lot in the GE IF alignment docs I found on Repeater Builder stating IF Alignment issues) After looking at other working base with the IF alignment test setup (o'scope looking at wave forms) it was apparent that this base was definitely out of alignment. Still having some issues where I can't get the audio level up to the 1 V RMS @ P904-11 and P904-17 as outlined in the alignment docs. (I can get 1V RMS but wave form coming out of there into repeater controller is clipping as it is over driven. . . When set for not clipping with 1KC tone @ 3KC deviation audio level is about .6-.7 V RMS) Main reason for needing schematic is to follow and see if any thingis weak in audio path thru everything and couldn't follow audio thru IFAS board as schematics didn't match up. My next question is what does R622 on the board (IFAS 19D432667G1 Rev A) do? Can't find it in text write up or details on RX Alignment. . . --OMIT THIS SENTENCE was looking at wrong parts listing-Now for interesting thing schematic lists R622 as being in REV B and later boards not REV A boards. Looks too good of a solder job and such to be anything other than factory so either this board is mislabeled for REV #'s or was one of the first boards to have R622 put in it before official REV B designation assigned. --OMIT THE ABOVE SENTENCE AS I WAS looking at wrong parts listing and hit send to quick-- (Reason is this board had both pots R622 and R608 totally at one of the stops-full CCW--along with other adjustments at one end or the other before I started with it) At this point everything is working in this repeater and working close to where it should be as audio levels just aren't up to snuff and a little on the weak side. . . . (will trace audio on next trip to the mountain and go from there) Thanks all Tony, KA3VOR -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of John Transue Sent: Saturday, January 03, 2009 10:06 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] mastr II question. . . Eric, You're AMAZING!! I'm glad you are watching the list. John -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Friday, January 02, 2009 9:02 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] mastr II question. . . Tony, The 19D432667G1 IFAS board is covered in LBI-4986R, here: www.repeater-builder.com/ge/lbi-library/lbi-4986r.pdf 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony Alviar (Home) Sent: Friday, January 02, 2009 5:19 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] mastr II question. . . OK not sure if this goes here or on the Mastr II and/or GE list figured I'd try here first though. . . . Have a Mastr II continuous duty high band repeater station (factory GE repeater) Looking for LBI # that covers IF/audio/squelch board p/n 19D432667G1 REV A most of this board matches the schematic in lbi-38507e however, this particular board has a large transformer near the transistors that mount on the heat sink and has two transistors versus one shown in lbi-38507e Any help would be appreciated. . . . If anyone has a copy of that particular LBI a copy would be appreciated. . . Thanks Tony, KA3VOR Yahoo! Groups Links __ NOD32 3733 (20090102) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com Yahoo! Groups Links
[Repeater-Builder] mastr II question. . .
OK not sure if this goes here or on the Mastr II and/or GE list figured I'd try here first though. . . . Have a mastr II continuos duty high band repeater station (factory GE repeater) Looking for LBI # that covers IF/audio/squelch board p/n 19D432667G1 REV A most of this board matches the schematic in lbi-38507e however, this particular board has a large transformer near the transistors that mount on the heat sink and has two transistors versus one shown in lbi-38507e Any help would be appreciated. . . . If anyone has a copy of that particular LBI a copy would be appreciated. . . Thanks Tony, KA3VOR tech.gif
RE: [Repeater-Builder] --DISREGARD--answer found already--mastr II question. . .
Was looking thru a stack of manuals here and found the one that had the board in it. . . As reference though LBI 4986 is what I was looking for. . . . Thanks anyway. Tony _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony Alviar (Home) Sent: Friday, January 02, 2009 8:19 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] mastr II question. . . OK not sure if this goes here or on the Mastr II and/or GE list figured I'd try here first though. . . . Have a mastr II continuos duty high band repeater station (factory GE repeater) Looking for LBI # that covers IF/audio/squelch board p/n 19D432667G1 REV A most of this board matches the schematic in lbi-38507e however, this particular board has a large transformer near the transistors that mount on the heat sink and has two transistors versus one shown in lbi-38507e Any help would be appreciated. . . . If anyone has a copy of that particular LBI a copy would be appreciated. . . Thanks Tony, KA3VOR tech.gif
RE: [Repeater-Builder] Decibal Products Antenna website
Decibel Products got bought by Andrew Corp. Andrew got bought out by CommScope. www.andrew.com Also search for db224 that is probably the antenna you are referring to. Tony, KA3VOR -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Brian K. Gaskamp Sent: Wednesday, December 31, 2008 5:35 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Decibal Products Antenna website Hello all, maybe I'm misspelling the name of the company but I can't seem to find the company who makes the Decibal Products type of antennas. They are the antennas that have the folded diploes that are very popular on most amateur repeater sites. I always thought they were called DB products antennas, but maybe not. Can someone direct me to the correct site. Thanks a bunch. Brian KA5BKG Yahoo! Groups Links
RE: [Repeater-Builder] Decibel Products Antenna website
Kevin are you sure about that? DB-- RFS? Phelps Dodge-- Celwave -- RFS and a few others. I'm pretty sure DB -- Andrew -- Commscope In fact running DB224 on www.andrew.com -- www.commscope.com/andrew/eng/index.html and drilling down to find the Base Station Antenna search tool http://awapps.commscope.com/catalog/product_narrow.aspx?id=134 Running DB224 shows it as a product line there. Tony _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer Sent: Wednesday, December 31, 2008 5:51 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Decibel Products Antenna website Decibel (1/10 of a Bel, of course) DB was absorbed by RFS some time ago: http://www.rfsworld.com/ Kevin Custer Brian K. Gaskamp wrote: Hello all, maybe I'm misspelling the name of the company but I can't seem to find the company who makes the Decibal Products type of antennas. They are the antennas that have the folded diploes that are very popular on most amateur repeater sites. I always thought they were called DB products antennas, but maybe not. Can someone direct me to the correct site. Thanks a bunch. Brian KA5BKG Yahoo! Groups Links http://groups.yahoo.com/group/Repeater-Builder/ Individual Email | Traditional http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com repeater-builder-unsubscr...@yahoogroups.com http://docs.yahoo.com/info/terms/ _ No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.1/1870 - Release Date: 12/31/2008 8:44 AM
RE: [Repeater-Builder] Decibel Products Antenna website
Not a bad idea for tonight! Have a pleasant one! _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Wednesday, December 31, 2008 8:53 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Decibel Products Antenna website Kevin may have started celebrating the New Year early ;-) - Original Message - From: Tony mailto:talv...@worldnet.att.net Alviar (Home) To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 31, 2008 8:47 PM Subject: RE: [Repeater-Builder] Decibel Products Antenna website Kevin are you sure about that? DB-- RFS? Phelps Dodge-- Celwave -- RFS and a few others. I'm pretty sure DB -- Andrew -- Commscope In fact running DB224 on www.andrew.com -- www.commscope.com/andrew/eng/index.html and drilling down to find the Base Station Antenna search tool http://awapps.commscope.com/catalog/product_narrow.aspx?id=134 Running DB224 shows it as a product line there. Tony _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer Sent: Wednesday, December 31, 2008 5:51 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Decibel Products Antenna website Decibel (1/10 of a Bel, of course) DB was absorbed by RFS some time ago: http://www.rfsworld.com/ Kevin Custer
RE: [Repeater-Builder] Decibel Products Antenna website
Brian, That I believe (wisco intl) is a reseller. Tesco, Hutton Communications and others resell the antenna. Currently running a DB408-A (450-470) on a ham repeater here in Western PA (443.750-W3PIE) and only thing truly noticed is when comparing to business band repeaters operating same antenna at same level on tower with less power than this repeater is running has further range from the repeater site to distant points. It appears that a downtilt is occuring when operated in Ham Bands. (tower Site for my setup is 985' HAAT when factoring both sides of the mountain in- when looking at the western side of the mountain, HAAT to all points West is closer to 2000' HAAT and covers in excess of 90-100 miles to 100 W mobiles) Use http://awapps.commscope.com/catalog/product_narrow.aspx?id=134 to help search the various antennas from Andew/Decibel Products and review the specs. Hope the info helps. Tony _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Brian K. Gaskamp Sent: Wednesday, December 31, 2008 6:15 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Decibel Products Antenna website Actually when I did a search on DB224 it took me to this site. http://www.wiscointl.com/decibel/dipoles/index.htm Thanks, Brian - Original Message - From: Kevin Custer mailto:kug...@kuggie.com To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 31, 2008 4:50 PM Subject: Re: [Repeater-Builder] Decibel Products Antenna website Decibel (1/10 of a Bel, of course) DB was absorbed by RFS some time ago: http://www.rfsworld http://www.rfsworld.com/ .com/ Kevin Custer Brian K. Gaskamp wrote: Hello all, maybe I'm misspelling the name of the company but I can't seem to find the company who makes the Decibal Products type of antennas. They are the antennas that have the folded diploes that are very popular on most amateur repeater sites. I always thought they were called DB products antennas, but maybe not. Can someone direct me to the correct site. Thanks a bunch. Brian KA5BKG Yahoo! Groups Links http://groups. http://groups.yahoo.com/group/Repeater-Builder/ yahoo.com/group/Repeater-Builder/ Individual Email | Traditional http://groups. http://groups.yahoo.com/group/Repeater-Builder/join yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) mailto:Repeater- mailto:repeater-builder-dig...@yahoogroups.com builder-dig...@yahoogroups.com mailto:Repeater- mailto:repeater-builder-fullfeatu...@yahoogroups.com builder-fullfeatu...@yahoogroups.com Repeater-Builder- mailto:repeater-builder-unsubscr...@yahoogroups.com unsubscr...@yahoogroups.com http://docs. http://docs.yahoo.com/info/terms/ yahoo.com/info/terms/ _ No virus found in this incoming message. Checked by AVG - http://www.avg. http://www.avg.com com Version: 8.0.176 / Virus Database: 270.10.1/1870 - Release Date: 12/31/2008 8:44 AM
RE: [Repeater-Builder] Decibel Products Antenna website
Chuck, Reason I mentioned downtilt is two of the UHF antennas on the tower with same gain factor on 450-470 with downtilt in the design has similar coverage to this unit. I'll agree a reduction in gain will do the same. Thanks for the correction. Tony _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Wednesday, December 31, 2008 9:03 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Decibel Products Antenna website Tony, a corporate-fed antenna like the 408 will not exhibit downtilt or uptilt when operated out of it's design range, however, it will exhibit slightly less gain. Chuck WB2EDV - Original Message - From: Tony mailto:talv...@worldnet.att.net Alviar (Home) To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 31, 2008 8:53 PM Subject: RE: [Repeater-Builder] Decibel Products Antenna website Brian, That I believe (wisco intl) is a reseller. Tesco, Hutton Communications and others resell the antenna. Currently running a DB408-A (450-470) on a ham repeater here in Western PA (443.750-W3PIE) and only thing truly noticed is when comparing to business band repeaters operating same antenna at same level on tower with less power than this repeater is running has further range from the repeater site to distant points. It appears that a downtilt is occuring when operated in Ham Bands. (tower Site for my setup is 985' HAAT when factoring both sides of the mountain in- when looking at the western side of the mountain, HAAT to all points West is closer to 2000' HAAT and covers in excess of 90-100 miles to 100 W mobiles) Use http://awapps.commscope.com/catalog/product_narrow.aspx?id=134 to help search the various antennas from Andew/Decibel Products and review the specs. Hope the info helps. Tony
[Repeater-Builder] Re: E.F. Johnson Repeaters
James I'm not sure when you contacted ICM about re rocking your TCXO but I had no problem with them in July 2008. I sent them 2 TCXO's. They were rocked and compensated and returned in less than 2 weeks. These were for the CR1010. Catalog # Description 41534 JOHNSON#521-3(518-2)TX(440-474)CR101 41533 JOHNSON#521-2(518-2)RX(440-474)CR101 37006 ICM TO INSTALL,TEMP/COMP TEST Maybe you should call ICM back. They are still listed in the current catalog. Tony 2c. Re: E.F. Johnson Repeaters Posted by: n0qzv_jhorn jah...@mahaska.org n0qzv_jhorn Sun Dec 14, 2008 8:07 pm (PST) I have a CR 1010 repeater that I have crystaled for the ham band. The first place I called was ICM and they did not want to work on the TCXOs at all.
[Repeater-Builder] Amateur Radio Repeater Usage
We're continuing to experience a significant drop off in usage of ham repeaters (all bands) in the Northern NJ area. It is not uncommon to find a repeater that has been dormant for months. What's it like in your part of the country?
[Repeater-Builder] Re: Desense has me pulling my hair out!
I know from experience that aluminum oxide is a noise generator under RF conditions. - Or course, silver oxide is conductive, unlike most other oxides.
Re: [Repeater-Builder] Re: SPAM was amber alert, SNOPES VERIFIED, sent to you by Dan Long
At 11:58 PM 2008-07-12 +, Tom wrote: While I did not originate this messge or have any previous part in it's distribution, I can only wonder, Terry, if your attitude about it might be a little different if it's contents pertained to one of those little boys clinging to your shoulders in your picture on QRZ. The fact that it's two years old only adds to the desperation those parents must be feeling over this. Don't forget, you are a living being first (even if it is only a human) and a ham second (or third or fourth or tenth). You would do well to try to show some compassion in that, seemingly, miserable life of yours. Whoa. Disagree with a person that's fine. However personal attacks such as using terms like miserable life of yours are unacceptable. That said the original poster should've check snopes.com or other similar sites or just done a quick search on the girl's name. When you read the story the girl was in the company of a man who was the boyfriend of the girls aunt and legal guardian and who apparently committed suicide. Thus the chances of the girl being alive are vanishingly small. And the posting was off topic for this mailing list. Tony
[Repeater-Builder] Current draw of the Daniels MT-2 repeater modules
Folks I see mention where the Daniels MT-2 repeater is a very low RX current so it is ideally suited to solar power and wind powered operations. However nowhere can I find concrete numbers as to RX/TX consumption. Or am I missing something obvious? Daniels don't have any MT-2 manusl available for download on their website which is rather irritating. Really, really dumb question on them. We currently want to put in place a VHF repeater and two UHF linking radios with a controller doing the DTMF linking between the VHF side and the UHF linking radios. Would two of their UHF repeaters would work well for the UHF linking? Thanks, Tony
Re: [Repeater-Builder] Reasonably low wind load antenna
At 09:09 AM 2008-06-24 -0500, N0ATH wrote: Put up the best one the clubs finances can possible be stretched to and you will end up spending the least in the in the long term. Club finances are in excellent shape. The club owned a tower for the last 30 years and was making reasonably money these last ten years renting space. However the landowner got greedy and want a 2000%, yes, 20x, increase in rent for pasture land. So we told him to f*** off and are in the middle of removing that tower. Which is why we are relocating the VHF repeater and UHF links. Tony
Re: [Repeater-Builder] Re: Reasonably low wind load antenna
At 09:51 PM 2008-06-24 -0600, Paul Plack wrote: You know, a Ringo only has metal-to-metal joints so it can be fit in a small box for shipping. It's not a bad performing antenna for its size otherwise, and would be great where low wind load is required. I wonder if someone with the right materials and heliarc welding skills couldn't clone a joint-less, clamp-less version which would be suitable for full duplex? Interesting point. I was having a discussion on an aluminum antenna mount for attaching to the end of the eaves on the house with a welding instructor yesterday. I could easily take the antenna to a local welding shop and he'd likely have it welded in ten minutes and charge me $5 or $10 cash. Tony
[Repeater-Builder] Reasonably low wind load antenna
Folks We're moving a VHF amateur repeater to a 96' Trylon self supporting tower. The overwhelming opinion is that our current 210C4 four bay folded dipole would be too much of a weight and wind load for that tower. One comment has been the Ringo Ranger. The wind load of the Cushcraft Ringo Ranger II ARX2B http://cushcraft.com/comm/support/pdf/RINGOS%20AR2%206%2010%20ARX450%20220B%202B.pdf is 0.5 square feet. The windload of the Sinclar SD214 http://www.sinclairtechnologies.com/catalog/resources/pdf/SD214-HF2P3LDF(D00S-LSABK)-DI.pdf (newer model to 210C4) is 5.57 square feet. Although the ice area is 17.04 sq ft. The SD214 has a dbd gain of 7.2, dbi of 9.3. The Ringo Ranger has dbi gain of 7.0. However the coverage plot in rural slightly hilly Alberta isn't all that much different. What would be suggestions for an alternative? Comments? Thanks, Tony (rapidly learning lots about towers and repeaters)
RE: [Repeater-Builder] Reasonably low wind load antenna
At 07:46 PM 2008-06-23 -0700, Eric Lemmon wrote: Please pose your questions about tower loading to the manufacturer of your tower. Make certain you have the exact wind area and weight data for your antenna (not estimates or opinions) before you call Trylon. Ok, where can I find exact data for the 210C4? Could you suggest a URL or Google search terms? Using 210C4 and wind gives ten hits at Google with nothing relevant. The Ringo Ranger is an extremely poor choice for a repeater antenna. Choose something better- much better! I'm looking for suggestions. Is there a better mailing list than this to ask? Tony
[Repeater-Builder] Vocom UHF Repeater Amp - Need Service Manual/Schematic Diagram
Anyone have a service manual and/or schematic diagram for a Vocom UHF 100 watt repeater amp (model # UVC100-XXRF) that they'd be willing to scan in and send via e-mail? Fax also works for me; e-mail off list for my fax number. Thanks. Tony - N2FDU
[Repeater-Builder] Moto MTR2000 Controller Interface Problem
A repeater group in our area has a VHF MTR2000 interfaced to a Zetron panel. For months now they've been experiencing audio level drops on weak signals into the repeater. There is no level change if the signal is DFQ. The local Moto authorized shop has thus far been unable to resolve the problem. Any ideas as to what the cause could be?
[Repeater-Builder] WTB - UHF Repeater Amplifier
WANTED: UHF repeater amplifier. Rack mount, continuous duty, 10-25 watts in 75-100 watts out, max current draw of 20 amps. Crescend, Vocom, TPL, TE Systems brands all okay. Please reply off forum or to n2fdu at arrl dot net Paypal payment available, or USPS Money order if requested. Thanks.
[Repeater-Builder] Trilectric A25100UR Repeater Amp
Anyone have a service manual or schematic for this unit that they wouldn't mind scanning in or faxing? Or, does anyone know what company purchased their assets? 25 in, 100 out, UHF, no fan. Thanks. Tony
[Repeater-Builder] UHF Repeater
Hi all, I have a UHF MSR2000 repeater and various RX TX modules. The exciter module is a VTE4001A for 403-430 MHz. The RX module is a VRE4001B for the 450-512 MHz. Has anybody had any success tuning these to the 430-450 MHz Ham band? The curious part is that the existing RX (VRE4001B) was used on 416.9375. Are they that wide band at the front-end preselectors? Any and all information will be appreciated. Tony VE3DWI.
[Repeater-Builder] second receiver splitter
Building an even splitter is no big deal for 50 ohms. I have cranked out hundreds over the years. Use a Wilkinson design. FOr two way its two pieces of 75 ohm coax, cut to 1/4 wave with velocity factor, like rg-179 and a 100 ohm resistor across the split ports. You even get a little isolation for all your work. Bandwidth is fair, isolation is better than you would expect and ease of construction is no big deal. There are web pages describing their construction and basics all over the web, like on Microwaves101.com. Heck, I built them for years without even understanding how they work and all of mine did ok. Or, I can build you one for 30 bucks, includeds the priority mail rate right now, shipped I have built this design from 44 mHz (got kind of big!) to 1500 mHz. My best experience is in the less than one foot of cable class. As you pass 800 mHz the parasitics start to get you. Had excellent luck at 100 mHz a few years ago too. that one carried almost 50 watts at its sum port. My point is, there is no excuse for using a TV splitter anymore! Get in touch direct if you need help with this. td wb6mie
[Repeater-Builder] second receiver splitter
Building an even splitter is no big deal for 50 ohms. I have cranked out hundreds over the years. Use a Wilkinson design. FOr two way its two pieces of 75 ohm coax, cut to 1/4 wave with velocity factor, like rg-179 and a 100 ohm resistor across the split ports. You even get a little isolation for all your work. Bandwidth is fair, isolation is better than you would expect and ease of construction is no big deal. There are web pages describing their construction and basics all over the web, like on Microwaves101.com. Heck, I built them for years without even understanding how they work and all of mine did ok. Or, I can build you one for 30 bucks, includeds the priority mail rate right now, shipped I have built this design from 44 mHz (got kind of big!) to 1500 mHz. My best experience is in the less than one foot of cable class. As you pass 800 mHz the parasitics start to get you. Had excellent luck at 100 mHz a few years ago too. that one carried almost 50 watts at its sum port. My point is, there is no excuse for using a TV splitter anymore! Get in touch direct if you need help with this. td wb6mie
RE: [Repeater-Builder] Times Microwave RT142 Cable - UPDATED
Wayne, That's interesting. I have some Times Microwave Systems cable that looks exactly like RG223. The numbers on the cable state 68999 AA-8338. I contacted TMS and got the following information. The 68999 is a Code Identification number the AA-8338 is the drawing number. The following provided specs are stated as. RG142 type with Polyethylene Jacket. Center Conductor: Solid Silver Plated Copper 0.037. Dielectric: Solid Polytetrafluoroethylene 0.116 (try saying that fast 10 times). First Shield: 36 Ga. Silver Plated Copper 0.139. Second shield: 36 Ga. Silver Plated Copper 0.162 Jacket: Black Polyethylene. Recommended minimum bend radius: 2.5 Weight per 1000 ft (Nominal) 40 lbs. Operating Temperature: -40 to +80 C. Impedance (Nominal): 50 Ohm. Velocity of Propagation (Nominal): 69.4 %. Capacity (Nominal): 29.3 pf/ft. Attenuation @ 400 MHz (Typical): 8.7 dB/100ft. Power rating @ 400 MHz (Typical): 375 Watts. Return Loss (50 MHZ - 2 GHz): 20 dB. 73, Tony VE3DWI * From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Eric Lemmon Sent: May 12, 2008 23:20 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Times Microwave RT142 Cable - UPDATED Wayne, My contact at Times Microwave Systems advised me that RT-142 is a triaxial cable in their REMIT specialty product line. The name refers to Reduced Electro Magnetic Interference. Although Times does claim that RT-142 is manufactured in accordance with the material requirements of MIL-C-17 it is not a QPL-listed product. Times will not mark the jacket unless specially requested by the customer. Here are the specs from the REMIT catalog page: Inner Conductor - 0.039 SCCS Dielectric OD - 0.116 Dielectric Material - Not specified Shield Braids - SC Shield Coverage - Not specified Jacket Material - FEP Jacket OD - 0.215 Nominal Impedance - 50 ohms Nominal Capacitance - 29.4 pF/ft Max Operating Voltage - 1,900 VRMS Max Attenuation at 400 MHz - 9.0 dB/100 ft Velocity of Propagation - Not specified If this cable is used in place of double-shielded coaxial cable such as RG-400, the insulating barrier should be trimmed back from the connector clamping or crimping area, so that there is positive metal-to-metal contact between the shields at both ends of the jumper. Care must be taken to select connectors that fit the dielectric without slop; otherwise, a significant impedance bump will occur at the cable/connector interface. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com [mailto:Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com] On Behalf Of Wayne Sent: Sunday, May 11, 2008 8:34 PM To: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com Subject: Re: [Repeater-Builder] Best coax for short jumpers in repeater cabinet? I have some cable that I cannot find the true information for. it is labeled as follows: 68999, TIMES MICROWAVE SYSTEMS, RT142 It is not listed, at least not readily seen, on the Times microwave web site. It appears to be a version of RG142. It is tan outer cover Double shielded, high density silvered (or tinned) with insulation between teh two shields.. clear solid inner insulation, and stiff solid center conductor. I bought it to use as RG142 for jumpers. It looks virtually the same as some labeled RG142 that came with a Micor UHF duplexer, though less flexible than the RG142 seems to be. I now wonder if it is interchangeabe or not? I have never seen any cable labeled RT instead of RG... Wayne WA2YNE
Re: [Repeater-Builder] Remote Solar - Propane and Wind Radio Repeater and Microwave Sites
At 04:16 PM 2008-05-10 +, skipp025 wrote: Well... you're going to need deal with snow? In your location on gray winter days you're probably talking less than 20% to 30% of the summertime solar energy from most solar arrays (on a good day with a tail wind). I thought solar cells were only 10-15% efficient on cloudy days? And days up here are about one to two hours shorter up here in winter compared to you folks in the Pacific NW. Although you likely get a lot more cloudy days than we do. The propane generator doesn't have to be mechanical... you can use a Thermal Electric Generator TEG and use the available heat to warm both the building and adjacent requirements as required. And TEG units run on other types of liquids and gases. An example in operation here in the Pacific Northwest... One modest tank of propane runs the TEG continous through the winter months. With a little planning... by the time the propane runs out and the TEG simply goes to sleep you have enough spring time solar energy available once again. I was unaware of this option. This sounds very interesting. Do you have some vendor names? I found a list at http://www.peltier-info.com/generators.html I've also run the numbers... a combination of solar and propane energy production can be operationally very cost effective against commercial power once you get past the initial investment. We have the funds for the initial investment. I just don't want to saddle the club with $40-$50 monthly payments. I'd far sooner spend, say, $5,000 now to avoid that even if it has an eight year payback. Besides $5,000 is what it would cost to have power poles put in place. Just some things to think about... Very nice things to think about. I especially like the no moving parts and heating up the shack as a benefit. Awesome. Tony
Re: [Repeater-Builder] DB-224 drain holes
Hello Dave: I have a DB-224 stored behind the garage. It didn't have the weep hole in the bottom of the elements. I have pictures of it somewhere in my files. What happened was water built up in a few of the elements, froze and bent the element like an arch or archer's bow. I thought my eyesight was going West on me looking at it at the 200 foot tower level. The aforementioned antenna was eventually replaced with a new same model, and it did have the weep holes on the elements. It's also interesting to note that I spent money to send it back to DB Products since they didn't believe me, then they did. They sent it back to me without repairing or replacing it. The least they could have done is thank me for the change in future product design or replace the bent elements! This is not the first time commercial and amateur radio manufacturers have eagerly placed products in the marketplace without proper testing in the Real World. Tony, K3WX Dave Baughn wrote: Does anyone know if there is any science behind the location of the weep holes in a DB224 element? I have had several crack at the very bottom, apparently due to freezing water inside. The hole is located on the side, an inch or two up from the bottom. Why not put it at the bottom so the water will drain? Moreover, why put it where it will let water into the bottom of the element? Dave Baughn Director of Engineering The University of Alabama Center for Public Television and Radio WVUA/WUOA-TV WUAL/ WQPR/ WAPR FM Box 870150 195 Reese Phifer Hall, 901 University Blvd. Tuscaloosa, Alabama 35487 205.348.8622 cell 205.310.8798 NEW EMAIL [EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
RE: [Repeater-Builder] DTMF controllable propane generators
At 07:38 AM 2008-05-09 -0400, Robert Pease wrote: Your solution may be easier than you think. By the time you get a generator, tank, controller of some sort, setup, fuel charges, and gen maintenance, not to mention going up the hill in the winter a few times to thaw the gen... $5000 one time then small monthly electric bill starts to sound cheap. Sometimes the answer isn't technical at all $30 to $50 a month electricity bill is a significant chunk of the clubs annual revenues. We do have money in the bank though. But these are all the kinds of numbers we are running through right now to figure out the best options. Tony
Re: [Repeater-Builder] DTMF controllable propane generators
At 01:55 PM 2008-05-09 -0600, Paul Plack wrote: Why DTMF controlled? If the batteries run down because no one starts the generator, you'll be unable to start it remotely, and have to go to the site. Use a repeater controller which has enough smarts to monitor the system, start and stop the generator automatically, page someone when there's a problem, and provide a DTMF override of the automatic functions if needed. I'm not at all sure if that's a good enough solution. Which is why I'm asking. Also if we see the batteries are getting down a bit but that the forecast is for five days of sunshine then there is no need to run the generator. So I'm not sure I want an automatic solution. I also realize that the more you use the batteries and the lower you drain them the shorter the battery life. That is draining a battery right down once shortens a battery life much more than draining a battery 1% 100 times. How secure is your site? A generator and fuel supply could be attractive resale opportunities for meth addicts. Then again, so might solar panels or a wind turbine. It's reasonably remote.At least an hours drive from the nearest city. Ten minutes from the nearest town. Lots of gravel roads which won't deter such but this hasn't been a problem out in rural Alberta. You haven't mentioned how your site is laid out, or how much space you have, but wind may be a good alternative. If you determine a realistic power budget, you might be surprised at how small a wind turbine would keep the site up. With enough reserve battery capacity and a repeater controller programmed to load-shed by reducing power when things get tight, much can be done. A few months ago, I looked into small turbines, and found one designed for portable use by motor home owners. It had blades about 1.3m in diameter, and IIRC would be capable of 200+ watts continuous in a 15 mph wind. My initial posting mentions that the owner of the tower felt that the land owner wouldn't like another wind turbine on the site. The MSR2000 may not be the best candidate for alternative power, since its idle current draw will be significant, and reducing transmitter power will not produce a proportionate drop in current consumption. I'd guess the GMR300s also have relatively high idle current. Yes, we're looking at that as well. One suggestion was to look at Daniels MT-2 Series repeaters. Not sure what would be suitable alternatives for the UHF linking radios but we'll consider all suggestions. smile Interesting ideas snipped. But, alas, FM land mobile users don't like weak signal work, and I eventually bit the bullet and went to a GE Mastr II and AC power. You may also find, as others are suggesting, that commercial AC mains with battery backup is the most cost-effective option in a practical system. This will be the only repeater covering a fair bit of the terrain with some overlap at the edges. I'm not quite sure just how much difference 5 watts output vs 100 watts will make. I'll let the other guy who understands the modelling a lot better than I do generate the coverage maps. And about half the activity is due to mobile users such as truckers as this repeater covers a chunk of a major highway. Tony
[Repeater-Builder] DTMF controllable propane generators
Folks We're moving a VHF MSR2000 repeater and two UHF GMR300 linking radso's to a site where commercial power will cost $5000 plus monthly fees. So we're looking at various options such as solar, wind and so forth. The land owner might not appreciate another wind turbine so one idea we're thinking about is a DTMF controlled propane generator. Has anyone experimented with such? I see mention of remote control generators so figure it should be doable. The current controller is a RLC-3 but that could be changed if it would help. The other obvious answer is to have the generator automatically come on when the voltage gets too low but I wonder how well that will work. We're in central Alberta, Canada so the days in winter are quite short and we can get 20 or 25 cloudy days in a row. We either need to put in a *lot* of solar panels or some other form of auxiliary power. Also the site may be accessible only by snowmobile for a number of months in the winter.We also will have to ensure that if the temperature looks like it's going to get colder than -35 for an extended period of time we'd better have the batteries charged right up as propane won't gasify colder than that. Thanks, Tony
RE: [Repeater-Builder] MSR2000
Hi Ron, Thanks for the info. That's exactly what I'm afraid might happen. But, as you say, the MSR2000 has better shielding and it's worth a try. Since it is unlikely that both receivers will be receiving their signals at the same time, I can always give each receiver, and it's mating far-end link TX, a different PL tone and get around it that way. If the IF's are talking to each other at least only one will open up. Tony VE3DWI _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wright Sent: May 1, 2008 00:55 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MSR2000 Tony, In the Mot Consoles using the Mitrek if they had same IF and were stacked they would talk to each other. I would think if single unit would not be a problem. It has to do when you have more than one in one place. I would think the MSR2000 is better shielded, but the IFs might not be shielded as good as needed if 2 rcvrs installed in one MSR2000. 73, ron, n9ee/r
[Repeater-Builder] MSR2000
Hi all, Does anyone know what the consequences are of using a second receiver with an IF of 10.7 instead of 10.8 MHz in the 2nd RX spot of an MSR2000. Tnx for any help VE3DWI
RE: [Repeater-Builder] Re: MSR2000
Thanks skipp. Yes it has all the filtering for a repeater. I don't have an R2 audio/squelch module but I'll use a second R1 module which I will modify with the addition of a small PL decode board and make sure it will reflect the same pin-out as the R2 board lay-out etc. Tony VE3DWI _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: April 30, 2008 19:48 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: MSR2000 Shouldn't change the performance regardless of which Receiver-IF you use if the duplex filter boards, covers and proper shield kits are installed. Sometimes some of the receiver stuff leaks RF but it shouldn't be that much, nor that far to change anything in the other receiver as long as the mentioned above options are in place. Motorola sold option kits to operate both receiver boards at the same time. cheers, skipp Tony Lelieveld [EMAIL PROTECTED] wrote: Hi all, Does anyone know what the consequences are of using a second receiver with an IF of 10.7 instead of 10.8 MHz in the 2nd RX spot of an MSR2000. Tnx for any help VE3DWI
RE: [Repeater-Builder] Fw: Thank You, Lord
Ralph, My apologies to you, it was NOT a personal attack. I was not offended by the content but it was the third such message coming through the list server. As I said in my first reply, it was “low speed dial-up 28.8 Kb” frustration showing through. Enough said, no more replies please. 73, Tony VE3DWI _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ralph Messer Sent: April 24, 2008 10:39 To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; Jay Rivenbark; justblonde0419; [EMAIL PROTECTED]; Pat Hartley; Repeater-Builder; [EMAIL PROTECTED]; smesser33 Subject: [Repeater-Builder] Fw: Thank You, Lord
RE: [Repeater-Builder] Fw: Thank You, Lord
Moderators, Why are we getting jokes on this list server? Isn’t there enough wasted bandwidth on the internet already? I am telling all my friends NOT to send me all kinds of that crap. Some attachments are 10Mb. Some people can’t get high speed internet because they live in the country and still use dial-up. How frustrated they must be. Does my frustrations show? You bet it is. 73 and thank you to all who do honour requests like this. Tony, VE3DWI _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ralph Messer Sent: April 24, 2008 10:39 To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; Jay Rivenbark; justblonde0419; [EMAIL PROTECTED]; Pat Hartley; Repeater-Builder; [EMAIL PROTECTED]; smesser33 Subject: [Repeater-Builder] Fw: Thank You, Lord - Original Message - From: Pat mailto:[EMAIL PROTECTED] Hartley To: Wanda Bowen mailto:[EMAIL PROTECTED] ; Wanda mailto:[EMAIL PROTECTED] ; Tracy mailto:[EMAIL PROTECTED] ; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com ; Steve mailto:[EMAIL PROTECTED] Greene ; Sharon mailto:[EMAIL PROTECTED] ; Rosa mailto:[EMAIL PROTECTED] Jay ; Ralph Messer mailto:[EMAIL PROTECTED] ; pope mailto:[EMAIL PROTECTED] armstrong ; Millie mailto:[EMAIL PROTECTED] ; Linda mailto:[EMAIL PROTECTED] ; Les mailto:[EMAIL PROTECTED] ; Kim mailto:[EMAIL PROTECTED] ; Judy mailto:[EMAIL PROTECTED] ; JJ mailto:[EMAIL PROTECTED] ; Jimmy mailto:[EMAIL PROTECTED] ; Jerry mailto:[EMAIL PROTECTED] Jen ; Jerry mailto:[EMAIL PROTECTED] ; Jack mailto:[EMAIL PROTECTED] ; Hazel mailto:[EMAIL PROTECTED] ; Gene mailto:[EMAIL PROTECTED] ; Diana mailto:[EMAIL PROTECTED] ; Danny mailto:[EMAIL PROTECTED] ; Crystal mailto:[EMAIL PROTECTED] ; Clay mailto:[EMAIL PROTECTED] ; Clarence mailto:[EMAIL PROTECTED] ; Clara mailto:[EMAIL PROTECTED] ; Cheryl mailto:[EMAIL PROTECTED] ; Butch mailto:[EMAIL PROTECTED] ; Bruce mailto:[EMAIL PROTECTED] ; Bill mailto:[EMAIL PROTECTED] ; Betty mailto:[EMAIL PROTECTED] Jess Sent: Thursday, April 24, 2008 10:14 AM Subject: Fw: Thank You, Lord - Original Message - From: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net To: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; crystalis4unc@ mailto:[EMAIL PROTECTED] yahoo.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] knc.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; angie.mccord@ mailto:[EMAIL PROTECTED] yahoo.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; hartley9444@ mailto:[EMAIL PROTECTED] aol.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] ent.com; juliebedard@ mailto:[EMAIL PROTECTED] bellsouth.net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; budlinpenley@ mailto:[EMAIL PROTECTED] bellsouth.net; rosieandjay@ mailto:[EMAIL PROTECTED] hotmail.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; crystalis4unc@ mailto:[EMAIL PROTECTED] yahoo.com; danielleb013@ mailto:[EMAIL PROTECTED] yahoo.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; shoppnqueen@ mailto:[EMAIL PROTECTED] ptmc.net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] net; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; judyblue2001@ mailto:[EMAIL PROTECTED] yahoo.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] .rr.com; donnamingusturner@ mailto:[EMAIL PROTECTED] yahoo.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; Jean.Lovelace@ mailto:[EMAIL PROTECTED] interstategroup.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] haft.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] RR.COM; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] .com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; rogersimpson12877@ mailto:[EMAIL PROTECTED] carolina.rr.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; tilliernbsnccc@ mailto:[EMAIL PROTECTED] hotmail.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] ens.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] rr.com; linniehelms@ mailto:[EMAIL PROTECTED] yahoo.com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] com; shirley.burris@ mailto:[EMAIL PROTECTED] wachovia.com
Re: [Repeater-Builder] More on Copper theft
At 06:49 PM 2008-04-22 -0500, Jim Miller WB5OXQ in Waco wrote: The buyers of copper must be trained to be selective about who they buy this stuff from and require good ID and keep records of who they buy from and be aware that the stuff might be stolen. That's the big problem. No matter how much you train the honest ones there will be renegades. I've heard the same thing about manhole covers. Unscrupulous buyers will buy those. And it's pretty darned clear that a manhole cover is not likely going to be surplus. Some outfits are now micro dotting the copper so it can be proven it's stolen.But melt it down and whos gonna know? Tony
[Repeater-Builder] Sad News - topozone.com Converts to Paid Service
topozone.com, previously a free source for geographic coordinate and topographic information, has now converted to a pay for service provider. Hopefully the same thing does not happen to google earth!
RE: [Repeater-Builder] Zetron ZMX dtmf mic
I have the programming instructions for a Zetron ZML mike. If you think it is the same, I'll be happy to email it to you. 73, Tony VE3DWI _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of barrypal Sent: April 20, 2008 10:55 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Zetron ZMX dtmf mic Does anyone have programming information for the Zetron ZMX dtmf mic? It is programmable using the dtmf pad on the mic. I am using it on a Motorola m1225 and it's working great but it has been programmed to send a dtmf on key down and key upCan't have that.. Thanks
RE: [Repeater-Builder] Re: Bad adapter
While investigating a problem with a Low-Band (46 MHz) repeater, we determined that the antenna harness on a DB 212-4 was bad. It turned out that two UHF female T connectors were bad. The center pin of the T was, instead of screwing into the center of the through pin, making contact with the aid of a little metal spring. It had rusted so badly that the spring broke in several pieces when we took it apart. Can you imagine this being used on UHF frequencies? The spring would act either like a choke or a resonant circuit with stray capacitance. Needless to say that we replaced them with the proper T's. 73, Tony VE3DWI --- In Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com, Steve Peg [EMAIL PROTECTED] wrote: I recall a problem with a UHF repeater with terrible desense that I had some 30 years ago. The original installer didn't have an N connector for the pigtail and used an N to BNC female adapter and stuck one wire of the RG8 in the center hole and soldered the braid to the outside. Needless to say it didn't work. Replacing that thing (which I still have) corrected the problem and it ended its service life with my repair. Steve KB3FPN
