Re: [Repeater-Builder] Wacom WP-639 Duplexer question
An additional 20dB of isolation can be realized by replacing the antenna Tee connector with a circulator. Port A to B tuned to the TX frequency, Port B to C tuned to the RX frequency. Connect TX to port A, antenna to B, Receiver to C. I'm using a set of WP-639 and with this setup I am seeing approx 102dB of rejection from the TX to RX port and 97dB the other way. On Wed, Sep 8, 2010 at 8:40 PM, Scott Zimmerman n3...@repeater-builder.com wrote: Rich, The short answer is: You need to find a bigger duplexer. Four 8 cans would work well such as a Wacom WP-641. You could simply call and order one if Wacom was still in business. (RIP) Unfortunately Tx/Rx bought them years ago for the name and to quash competition. They can be found occasionally for around $600 or so on the used market. Other alternatives are as follows: 1) You can use two antennas and split the 639 duplexer so that 2 cans are in series between the TX and the TX antenna, and the other two are in series between the RX and the RX antenna. Terry WX3M a list member is doing this with VERY good results on one of his VHF machines. Of course this involves the expense of additional feedline and a second antenna. I think you said you had this machine on an 80' mast. 50' or so of vertical isolation coupled with the additional isolation of splitting the duplexer *may* be enough isolation to get rid of all the desense. TX goes on bottom, RX on top. 2) Buy additional Band Pass / Band Reject (BPBR) cans. You can add these additional cans between the Tx and/or Rx and the duplexer. These cans will give additional isolation. Even if you can find just Pass or Notch cavities, tune them and put them in the correct place. With both of the above options, you are looking to add to the isolation between your transmitter and receiver. You'll find you'll do best by adding cans to your transmitter that notch side-band noise at your receiver's frequency. In other words, do what you can to insure your receiver is not hearing your own transmitter's sideband noise on it's input. Pass cans tuned to the TX frequency or NOTCH cavities tuned to your *RX* frequency placed in the transmit line are your best hope. Good luck, Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531
Re: [Repeater-Builder] Re: Interference on VHF repeater
Look around for a switch mode power supply that uses 600kHz as the switch frequency. SMPS Battery Chargers are popular for causing this. Also florescent twist lights are really good for making desense on VHF.
Re: [Repeater-Builder] Re: Circular polarization for VHF repeaters?
FM Broadcast started out Horizontally polarized. Circular polarization was later authorized under 2 stipulations. The vertical plane power can not exceed the horizontal power ERP, and the horizontal plane ERP is used for the stations ERP. So a station with a horizontal antenna can effectively double the ERP by switching to a circular antenna, of course it takes 2 CP antennas to equal one horizontal antenna. On the receive side of things, Horizontal is usually used in homes and Vertical or CP on cars. CP also helps quite a bit with mobile flutter.
Re: [Repeater-Builder] Motorola R2600 question
Lets get some pictures johnny On Thu, Sep 2, 2010 at 10:25 AM, wa6epd lme...@cox.net wrote: Wondering if anyone has found a source for the memory backup battery for the Motorola R2600 Service Monitor? Motorola says the part is obsolete and General Dynamics is doing some research, but it doesn't sound good. This one is so dead, that it doesn't show polarity, otherwise I could just replace it with some alkalines. Any ideas are welcome. Yahoo! Groups Links
Re: [Repeater-Builder] Duplexers
I haven't seen problems from condensation. Now salt water corrosion from installations on a coast, that's a pretty big problem. I've got a set of cans where the invar has actually rusted, and the connectors were all shot. On Tue, Aug 31, 2010 at 10:42 AM, ka9qjg ka9...@wowway.com wrote: Wow this must of Really been a Dumb question , No one answered it Don KA9QJG *From:* Repeater-Builder@yahoogroups.com [mailto: repeater-buil...@yahoogroups.com] *On Behalf Of *ka9qjg *Sent:* Monday, August 30, 2010 9:07 PM *To:* Repeater-Builder@yahoogroups.com *Subject:* RE: [Repeater-Builder] Duplexers Since We are on the Topic of Duplexers, And some claim there is no such thing as a Dumb Question but at the Risk of Asking one I will take a chance , I have the Wacom 4 can on My 220 System, The Question I have in a non controlled environment such as No Heat or Air Will the Duplexer have any problems inside with Condensation from Heating up in use and Cooling down Thanks Don KA9QJG
Re: [Repeater-Builder] Trip lite
They don't provide schematics, but they will be more than happy to sell you a new power supply. After that conversation I swore off buying Tripp Lite anything. Pretty much replace all the semi-conductors and any electrolytics that have exploded. On Mon, Aug 30, 2010 at 1:26 PM, Chuck Kelsey wb2...@roadrunner.com wrote: Swap the 723 chip and go from there. You might not need anything more. Chuck WB2EDV - Original Message - *From:* Ralph S. Turk w7...@comcast.net *To:* Repeater-Builder@yahoogroups.com *Sent:* Monday, August 30, 2010 3:48 PM *Subject:* [Repeater-Builder] Trip lite Anybody out there in radio land have schematics for Trip-lite power supplies. I have two PR 25A with different regulator boards. One works the other doesn't. Good ps 14vdc no load 13 vdc full load Bad ps15.8 vdc did not try a load yet. Bad unit has an updated regulator board so I can't compare apples to apples. Ralph, W7HSG -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3102 - Release Date: 08/30/10 02:35:00
Re: [Repeater-Builder] Can a Master 3 narroband
If it has the correct IF module it can. Early modules were wide, Later modules were Wide/Narrow software selectable. On Fri, Aug 27, 2010 at 8:07 AM, Jim in Waco WB5OXQ wb5...@grandecom.netwrote: I have a uhf master 4 that has been used for years as a paging exciter. Now the pager business is in the tank I would like to make the master 3 into aq repeater for commercial needs to replace a msr2000 because the msr cannot narroband. If the ge can't either I dont want to waste time and just buy a new repeater that can narroband. wb5...@grandecom.net
Re: [Repeater-Builder] Can a Master 3 narroband
While it is possible to use one of these narrowbanding kits, it would not be type accepted for commercial use unless someone paid for the testing and filed with the FCC. On Fri, Aug 27, 2010 at 10:56 AM, Tom Manning af...@bellsouth.net wrote: Hello Jim I note your message about narrowbanding and the comment about the MSR2000. I have seen no info on doing so but it seems to me that the MSR200 could be narrowbanded. The MSR is very similar to the Mitrek and it can be narrowbanded by using a kit by a company that slips my mind. Therefore I feel narrowbanding would be possible. I will be attempting this in six months or so. 73 de Tom Manning, AF4UG - Original Message - *From:* Jim in Waco WB5OXQ wb5...@grandecom.net *To:* Repeater-Builder@yahoogroups.com *Sent:* Friday, August 27, 2010 10:07 AM *Subject:* [Repeater-Builder] Can a Master 3 narroband I have a uhf master 4 that has been used for years as a paging exciter. Now the pager business is in the tank I would like to make the master 3 into aq repeater for commercial needs to replace a msr2000 because the msr cannot narroband. If the ge can't either I dont want to waste time and just buy a new repeater that can narroband. wb5...@grandecom.net
Re: [Repeater-Builder] Wacom duplexer
http://repeater-builder.com/ge/lbi-library/lbi-38763a.pdf On Fri, Aug 27, 2010 at 4:25 PM, NORM KNAPP nkn...@twowayradio.net wrote: Hi guys. I just picked up a set of Wacom duplexers. They have this on them: REMEC WACOM 344A3371-P1. They may have come with a GE Mastr III repeater some time back and they are VHF. Does anyone have a spec sheet on these? Thanks N5NPO Norm Yahoo! Groups Links
Re: [Repeater-Builder] Narrowband Range -was- Seeking emergency system design help
As receiver bandwidth narrows, higher frequency stability is required. Handhelds with ovenized reference oscillators are not very practical. On Fri, Aug 27, 2010 at 8:01 PM, Matthew Kaufman matt...@matthew.at wrote: On 8/27/2010 7:33 PM, larynl2 wrote: This has always interested me, and I've never seen a good technical reason for a loss of range with narrow deviation and receivers, either. Butsomewhere one must exist. If it didn't, there'd be no reason not to take analog deviation down to say, 1 kc., or 0.1 kc., would there? There are several good references online. A good balance between theory and understandability is at: http://urgentcomm.com/networks_and_systems/mag/narrowbanding-system-coverage-effect-201004/ and http://www.adcommeng.com/Narrowbanding_for_Technicians.pdf Essentially as the modulation index goes down, the difference between the modulated signal and noise becomes lower, and so more signal strength (to better saturate the FM receiver's detector) is required to compensate. And I don't think that knowing a repeater's tail signal strength doesn't change is an apples to apples comparison. It is all about intelligibility of the modulated signal, not the quieting of the unmodulated signal. In fact, for the unmodulated case the narrower IF filters make narrowband *better*. Matthew Kaufman Yahoo! Groups Links
Re: [Repeater-Builder] Re: Narrowband Range -was- Seeking emergency system design help
I was talking about 1kHz and 100 Hz deviation, not 2.5kHz. On Fri, Aug 27, 2010 at 8:30 PM, wb6dgn wb6...@att.net wrote: As receiver bandwidth narrows, higher frequency stability is required. Handhelds with ovenized reference oscillators are not very practical. TCXOs are more than adequate to do the job. Typical frequency stability for a +-5.0kC system is 5ppm. TCXOs of 0.5ppm are common and not terribly expensive; more than 2.5 times more stable than conventional wisdom would claim necessary for 6.25kC bandwidth. If you use a good tight receiver with a reasonably quiet front end, there should be NO appreciable difference in range; the NB system could even be a bit better. Tom --- In Repeater-Builder@yahoogroups.com, DCFluX dcf...@... wrote: As receiver bandwidth narrows, higher frequency stability is required. Handhelds with ovenized reference oscillators are not very practical. On Fri, Aug 27, 2010 at 8:01 PM, Matthew Kaufman matt...@... wrote: On 8/27/2010 7:33 PM, larynl2 wrote: This has always interested me, and I've never seen a good technical reason for a loss of range with narrow deviation and receivers, either. Butsomewhere one must exist. If it didn't, there'd be no reason not to take analog deviation down to say, 1 kc., or 0.1 kc., would there? There are several good references online. A good balance between theory and understandability is at: http://urgentcomm.com/networks_and_systems/mag/narrowbanding-system-coverage-effect-201004/ and http://www.adcommeng.com/Narrowbanding_for_Technicians.pdf Essentially as the modulation index goes down, the difference between the modulated signal and noise becomes lower, and so more signal strength (to better saturate the FM receiver's detector) is required to compensate. And I don't think that knowing a repeater's tail signal strength doesn't change is an apples to apples comparison. It is all about intelligibility of the modulated signal, not the quieting of the unmodulated signal. In fact, for the unmodulated case the narrower IF filters make narrowband *better*. Matthew Kaufman Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Re: Intermod Calculation
I've seen this before on Wacom BpBr duplexers. Remove the coupling loop from the cavity and re-solder the connectors. Use 2% silver bearing solder if you can find it. On Wed, Aug 25, 2010 at 1:27 PM, Tim Sawyer tisaw...@gmail.com wrote: Here's the latest: We went up to our site yesterday. We added a lighting arrestor to the receive antenna. We grounded the chassis/rail/cabinet as it was only grounded via the power cord previously. Didn't expect this to fix the paging problem, it just needed to be done. I did find a loose UHF connector on the Wacom. This is a two cavity BP filter on the receive side. I don't know if the loose connector was the problem but it's much cleaner now. We ran in carrier squelch for about an hour and didn't hear much of anything. A dramatic improvement and amazing for our dirty hill. Today there have been a couple of pages bust through the P/L but it's 1,000% better than it was and it's still pretty quite in carrier squelch. Do you think the loose connector and/or grounding could have helped or is this some sort of cruel coincidence? -- Tim :wq On Aug 24, 2010, at 3:48 PM, Walter H wrote: We also had a problem with a 454 pager. Quintron with a 1/4 k amp. Only one in the metro area had a spur, but that one traveled as the PA cage changed temperature. Got a hold of the paging company, and they turned each one off until we saw the spur go away. Final tube had been replaced and not properly neutralized. WalterH --- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com, Tom W2MN w...@... wrote: We had a pager spur problem with our repeater (no pl). The problem would come and go. We determined it happened mostly with time of day (outside temperature). Sometime it was just a short 1 second event and sometimes it would hold for a bit more (maybe 2 -5 sec). We setup a satellite multimode radio (actually dial in the frequency with widest bandwidth setting) and monitored the repeater input with a tape recorder and vox. We did this to capture the audio so we could listen to characteristics and THE CW CALLSIGN. We captured enough of the callsign that we were able to indentify the whole call (and freq) from the FCC database. With that, we were able to monitor the repeater and the pager for hits. Yes, it did hit some times and not others. The reason was, it was caused by an unstable spur that drifted up and down the ham band with temperature and the amount of pager traffic. It was also hitting other repeaters as it drifted but most of the other repeaters had pl. There was a chain of pagers using the same freq and callsign and we had to figure out which tower it was. We used a beam antenna and chased the spur up/down the band until we were able to get a definite direction. The next step as to visit the site AREA with an HT and just scan the ham repeater input freqs during the likely time of day. Bingo, the spur was loud and clear!. Of course the pager owner was in denial but being a pest for a couple of weeks got the problem removed. They claim it was a spur in the final PA that had been serviced just at the time the problem started. They replaced the PA. Hope this story helps. Tom
Re: [Repeater-Builder] Re: Intermod Calculation
Possibly. Wiggle the connectors while looking at the cavity on a spectrum analyzer and if the peaks and dips change significantly that's probably the problem. The one I had the solder kinda looked like it was sprayed out of one joint at the top of the can, and there was a lot of flux around the joint. On Wed, Aug 25, 2010 at 2:17 PM, Tim Sawyer tisaw...@gmail.com wrote: By the way, the Wacom model number is WP-430-2. -- Tim :wq Begin forwarded message: * * *To: *repeater-buil...@yahoogroups.com *Subject: **Re: [Repeater-Builder] Re: Intermod Calculation* This is a couple of pass cavities, not a duplexer. Do the band pass cavities have the same problem? -- Tim :wq On Aug 25, 2010, at 1:32 PM, DCFluX wrote: I've seen this before on Wacom BpBr duplexers. Remove the coupling loop from the cavity and re-solder the connectors. Use 2% silver bearing solder if you can find it. On Wed, Aug 25, 2010 at 1:27 PM, Tim Sawyer tisaw...@gmail.com wrote: Here's the latest: We went up to our site yesterday. We added a lighting arrestor to the receive antenna. We grounded the chassis/rail/cabinet as it was only grounded via the power cord previously. Didn't expect this to fix the paging problem, it just needed to be done. I did find a loose UHF connector on the Wacom. This is a two cavity BP filter on the receive side. I don't know if the loose connector was the problem but it's much cleaner now. We ran in carrier squelch for about an hour and didn't hear much of anything. A dramatic improvement and amazing for our dirty hill. Today there have been a couple of pages bust through the P/L but it's 1,000% better than it was and it's still pretty quite in carrier squelch. Do you think the loose connector and/or grounding could have helped or is this some sort of cruel coincidence?
Re: [Repeater-Builder] Re: Low Band Antenna for both 6 10 meters.
Get 2 CB whips, Cut 1 for 1/4 wave at 10M and cut the other for 1/4 wave at 6M Build a metal spacer bracket. 3 inches long by 5/8 or 3/4 Drill 2 holes on the end and one in the center for the 3/8-24 hardware. Bolt whips to the ends of the spacer, use star style lock washers. Use a 3/8-24 x 3/4 long bolt and attach spacer and whip assembly to a ball mount. Epoxy a 3 plastic spacer bracket 5 down from the top of the 6m whip to act as a spacer between it and the 10m whip.
Re: [Repeater-Builder] NSN 6054A 12W speaker schematic ?
Just by your description of the pins, I would suggest you look at the LM-380, 2.5W amplifier. They are tied together as they act as the chips heatsink. On Fri, Jul 23, 2010 at 1:19 PM, hitekgearhead hitekgearh...@hotmail.com wrote: Hey Guys. I was looking at the schematic for the above mentioned speaker (thank you repeater builder site) and I had a few questions. First, does anyone know where to find a replacement for the 5184320A99 dual op-amp labeled U1? Secondly, Is this op-amp basically being used as a buffer, preamp, and inverter? Thirdly, what on earth are pins 3, 4, 5 and pins 10, 11, 12 doing? I have never seen so many pins on an op-amp tied together. Thanks! Albert Yahoo! Groups Links
Re: [Repeater-Builder] NSN 6054A 12W speaker schematic ?
Oops, didn't realize it was the stereo version, Try LM1887. On Fri, Jul 23, 2010 at 1:28 PM, DCFluX dcf...@gmail.com wrote: Just by your description of the pins, I would suggest you look at the LM-380, 2.5W amplifier. They are tied together as they act as the chips heatsink. On Fri, Jul 23, 2010 at 1:19 PM, hitekgearhead hitekgearh...@hotmail.com wrote: Hey Guys. I was looking at the schematic for the above mentioned speaker (thank you repeater builder site) and I had a few questions. First, does anyone know where to find a replacement for the 5184320A99 dual op-amp labeled U1? Secondly, Is this op-amp basically being used as a buffer, preamp, and inverter? Thirdly, what on earth are pins 3, 4, 5 and pins 10, 11, 12 doing? I have never seen so many pins on an op-amp tied together. Thanks! Albert Yahoo! Groups Links
Re: [Repeater-Builder] NSN 6054A 12W speaker schematic ?
Err. LM-1877 On Fri, Jul 23, 2010 at 1:35 PM, DCFluX dcf...@gmail.com wrote: Oops, didn't realize it was the stereo version, Try LM1887. On Fri, Jul 23, 2010 at 1:28 PM, DCFluX dcf...@gmail.com wrote: Just by your description of the pins, I would suggest you look at the LM-380, 2.5W amplifier. They are tied together as they act as the chips heatsink. On Fri, Jul 23, 2010 at 1:19 PM, hitekgearhead hitekgearh...@hotmail.com wrote: Hey Guys. I was looking at the schematic for the above mentioned speaker (thank you repeater builder site) and I had a few questions. First, does anyone know where to find a replacement for the 5184320A99 dual op-amp labeled U1? Secondly, Is this op-amp basically being used as a buffer, preamp, and inverter? Thirdly, what on earth are pins 3, 4, 5 and pins 10, 11, 12 doing? I have never seen so many pins on an op-amp tied together. Thanks! Albert Yahoo! Groups Links
Re: [Repeater-Builder] Transmitter Combiner
Maybe a pair of those 6 cavity mobile duplexers with the 5 MHz split can be configured as 6 notch sections each to reject the opposite frequency. and then combine them with a T to the antenna. Lossy, but should be cheap, I've seen those go in the $20 range. On Thu, Jul 15, 2010 at 1:49 PM, MCH m...@nb.net wrote: About the only way is via a duplexer. (Cheap? Well... used??? ;- ) Joe M. na4it wrote: Is there a cheap way to combine two txcvrs into one antenna... 144.39 APRS and 145.550 packet? Yahoo! Groups Links
Re: [Repeater-Builder] Transmitter Combiner
I could live with 3dB of loss which is about what I would expect per leg. I've ran the UHF notch duplexers back wards and they have ran ok, but the insertion loss does go up like 1-2dB. If you want to get picky you would have to modify each set so that the coupling loops and coaxes are the same, but probably wouldn't be worth the effort. That are modify the coaxes so the low frequency goes through all 6 low notch cavities and the same for the high. The isolator system is the way to go for repeaters, but not desireable for simplex radios. You'd have to split out the seperate RX and TX lines and then have a multicoupler and filter for the receivers and another antenna. On Thu, Jul 15, 2010 at 6:10 PM, n...@no6b.com wrote: At 7/15/2010 13:53, you wrote: Maybe a pair of those 6 cavity mobile duplexers with the 5 MHz split can be configured as 6 notch sections each to reject the opposite frequency. and then combine them with a T to the antenna. Even though they're notch duplexers, each side has a very weak pass response, just enough so that you can't use the low pass side as a high pass. As a result, trying to use one as a 6-section notch filter by putting all the notches on the same frequency using the TX RX ports as input output won't work, as it would have several dB of loss @ 5 MHz offset, even more @ ~1.2 MHz. Another alternative to a full size 2 meter duplexer would be a dual isolator following by a pass cavity on each TX, then T the cans together using the correct phase-critical lengths of coax. Might be cheaper if you happen to have an inexpensive source for 4 VHF isolators. Bob NO6B Yahoo! Groups Links
Re: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM
Hey, I didn't need DCS at the time. Looks like TX code is at 80-81 Hex, and RX code is 82-83 81 EC = D023N 81 E6 = D026N What DCS code do you need? On Thu, Jul 15, 2010 at 8:46 PM, Jeff Lavoie - KB1SPH/WQEX694 kb1...@wqex694.info wrote: Ok, let me make it a little more clear for anybody that might not have understood the first message. (No offense intended Eric) A Kenwood TKR-820 repeater has CTCSS and DCS encoding and decoding built into it with an on-board controller. The configuration is stored in a EEPROM chip, 93C46 (or 93LC46). What I'm trying to do is figure out how to change the configuration without using the expensive Kenwood programmers, unfortunately this one isn't just a simple cable. I have a serial EEPROM reader/writer, so I used instructions found in the repeater-builder archives at http://www.mail-archive.com/repeater-builder@yahoogroups.com/msg63481.html to modify the configuration for the ctcss tones. Unfortunately, the person who wrote that article didn't figure out the DCS configuration. So I'm hoping that someone who has a TKR-820 already configured for DCS has the ability to read the EEPROM chip as well and send me a copy. I hope that clears it up a little more. Jeff, KB1SPH / WQEX694 -- From: Eric Lemmon wb6...@verizon.net Sent: Thursday, July 15, 2010 10:24 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM Jeff, I suspect you may be headed for disappointment. CTCSS (PL) and CDCSS (DPL) are handled differently within the radio. While the former is audio, albeit sub-audible, the latter requires a DC connection to the modulator in order to create the DCS signal at a 134.4 Hz rate. In other words the CTCSS hardware will not work for CDCSS. Perhaps some readers who have TKR-820 stations with CDCSS capability can advise you about the modifications and/or optional modules that are necessary to handle DCS. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kb1...@wqex694.info Sent: Thursday, July 15, 2010 7:03 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM Ok, I'm playing around with my Kenwood TKR-820 a bit. I've found the instructions for HEX editing the channel and ctcss information after reading it from the EEPROM, and they work great. But there's nothing about DCS. I'm wiing to try and decipher how to get the DCS, but I need a look at the information from a chip that contains DCS information. Since I don't have a real programmer I can't change mine and then look at it. So if anyone has a TKR-820 with DCS in it and a EEPROM reader, it would be greatly appreciated if you are wiling to read the chip with PonyProg2000 (http://www.lancos.com/ppwin95.html) and send me a copy. Thanks, Jeff, KB1SPH / WQEX694 Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM
Scratch that 00-01 is TX, 02-03 is RX On Thu, Jul 15, 2010 at 9:35 PM, DCFluX dcf...@gmail.com wrote: Hey, I didn't need DCS at the time. Looks like TX code is at 80-81 Hex, and RX code is 82-83 81 EC = D023N 81 E6 = D026N What DCS code do you need? On Thu, Jul 15, 2010 at 8:46 PM, Jeff Lavoie - KB1SPH/WQEX694 kb1...@wqex694.info wrote: Ok, let me make it a little more clear for anybody that might not have understood the first message. (No offense intended Eric) A Kenwood TKR-820 repeater has CTCSS and DCS encoding and decoding built into it with an on-board controller. The configuration is stored in a EEPROM chip, 93C46 (or 93LC46). What I'm trying to do is figure out how to change the configuration without using the expensive Kenwood programmers, unfortunately this one isn't just a simple cable. I have a serial EEPROM reader/writer, so I used instructions found in the repeater-builder archives at http://www.mail-archive.com/repeater-builder@yahoogroups.com/msg63481.html to modify the configuration for the ctcss tones. Unfortunately, the person who wrote that article didn't figure out the DCS configuration. So I'm hoping that someone who has a TKR-820 already configured for DCS has the ability to read the EEPROM chip as well and send me a copy. I hope that clears it up a little more. Jeff, KB1SPH / WQEX694 -- From: Eric Lemmon wb6...@verizon.net Sent: Thursday, July 15, 2010 10:24 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM Jeff, I suspect you may be headed for disappointment. CTCSS (PL) and CDCSS (DPL) are handled differently within the radio. While the former is audio, albeit sub-audible, the latter requires a DC connection to the modulator in order to create the DCS signal at a 134.4 Hz rate. In other words the CTCSS hardware will not work for CDCSS. Perhaps some readers who have TKR-820 stations with CDCSS capability can advise you about the modifications and/or optional modules that are necessary to handle DCS. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kb1...@wqex694.info Sent: Thursday, July 15, 2010 7:03 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] TKR-820 CTCSS/DCS EEPROM Ok, I'm playing around with my Kenwood TKR-820 a bit. I've found the instructions for HEX editing the channel and ctcss information after reading it from the EEPROM, and they work great. But there's nothing about DCS. I'm wiing to try and decipher how to get the DCS, but I need a look at the information from a chip that contains DCS information. Since I don't have a real programmer I can't change mine and then look at it. So if anyone has a TKR-820 with DCS in it and a EEPROM reader, it would be greatly appreciated if you are wiling to read the chip with PonyProg2000 (http://www.lancos.com/ppwin95.html) and send me a copy. Thanks, Jeff, KB1SPH / WQEX694 Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Invar Rods
Invar is a special material. It is special that is has very low tempreture expansion characteristics. When used for the tuning rod in a duplexer it will compensate the expansion in the copper center conductor so that the frequency of the cavity does not drift. I calculated a 6m cavity that uses steel tuning rods would drift 50kHz over 30-130 degrees farenheit. With invar this would be more like 1-2 kHz over the same temperature range. How long are the rods? I could go for some that are in the 5 1/2 foot range. On Thu, Jul 15, 2010 at 10:05 PM, ka9qjg ka9...@wowway.com wrote: Glen , I know some will think If I “am to dumb to know what they are , Then I do not need them . But I still would like to know in layman terms what is a INVAR Rodif I was guessing Maybe something that goes in a duplexer Thanks Don KA9QJG *From:* Repeater-Builder@yahoogroups.com [mailto: repeater-buil...@yahoogroups.com] *On Behalf Of *Glenn Little WB4UIV *Sent:* Thursday, July 15, 2010 9:31 PM *To:* Repeater Group *Subject:* [Repeater-Builder] Invar Rods Does anyone need INVAR rods? I salvaged some from a TV audio / video RF combiner. 73 Glenn WB4UIV
Re: [Repeater-Builder] Tinkering with Repeater Controller firmware - source code
Best I can tell the original code was written in assembler on an IMASI 8080 with a development system of some kind. Last I checked the source code from Link Communications was not available. On Tue, Jul 13, 2010 at 4:12 PM, n...@no6b.com wrote: At 7/12/2010 20:56, you wrote: Jeff Lavoie - KB1SPH/WQEX694 kb1...@... wrote: Ok, I can get you the date code tomorrow if you find some spare time to check. It's too bad I couldn't get a copy of the original code and maybe modify it myself. I like to tinker around with existing programming a bit, but I wouldn't know where to begin if I were to start from scratch. Jeff, KB1SPH / WQEX694 I have to look at whet ever the processor is to comment on modifying the code. I'm reversing out the source code for one of the ACC Repeater Controllers and it's not for the casual person to attempt. At 443 pages of disassembled source code I'd say you really have to want to do something like this. And I'm doing it for fun... Was the original code done in an assembler (my guess, given the vintage)? Have you asked Link Comm if by chance they have any source code? Bob NO6B Yahoo! Groups Links
Re: [Repeater-Builder] Erring on the Side of Caution....
Thanks for the hot tip! Just what I needed! On Thu, Jul 1, 2010 at 1:44 PM, La Rue Communications laruec...@gmail.comwrote: Ran across this website http://www.hampedia.net/motorola/mt-1000.php Found out it has the RSS to the Motorola MT1000. And me being the cautious guy to never get into legal crap with the big boys as I know how Motorola's Software License Agreement is big and scary.. Is this site legitimate or is this site just asking for trouble by posting RSS for the general public? Thoughts? Comments? Should I stay away from these people? Thanks! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] 1296 cavity filter
Try running a 440 cavity filter in 3/4 wave mode. On Wed, Jun 30, 2010 at 5:52 AM, robertogrb is0...@is0grb.it wrote: Hi to all. I'm searching a project of 1296 cavity filter, to use also for atv 1240/1290MHz. Could be interesting also a project of 1296 cavity filter with unique antenna out. Someone can help me? Many thanks Best 73 Roberto IS0GRB Yahoo! Groups Links
Re: [Repeater-Builder] Piston Trimmer Voltage Rating
Usually 250V. The more robust ones are rated for 500V, but generally as capacitance range goes up working voltage goes down. See if you can find some Russian surplus on ebay, those trimmers are built like a tank. On Sun, Jun 27, 2010 at 5:58 PM, Tim tahr...@swtexas.net wrote: Hi Eric, I've been on Dan's site he has some good stuff. I had the piston trimmers 'in-stock', so that's what I used. (as did the original design) Was curious About the WV of them. Thanks, Tim -- From: Eric Grabowski ejgrabow...@yahoo.com Sent: Sunday, June 27, 2010 5:02 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Piston Trimmer Voltage Rating Instead of piston trimmers you might want to try ARCO padders (postage stamp size that can tolerate higher levels of rf current) or small air variable capacitors. I have found both at reasonable prices at this site: http://www.danssmallpartsandkits.net/ 73 and aloha, Eric KH6CQ --- On *Sun, 6/27/10, Tim tahr...@swtexas.net* wrote: From: Tim tahr...@swtexas.net Subject: [Repeater-Builder] Piston Trimmer Voltage Rating To: Repeater-Builder@yahoogroups.com Date: Sunday, June 27, 2010, 11:18 AM Hi folks, Am just finishing up the 6 meter heliax duplexer project, and am getting some pretty good numbers. (3 'cans' on each side, 90dB notch about 1.2dB 'pass' attenuation).. Anyhow, I used some Johanson piston trimmers that I had, but evidently they are a bit shy on the working voltage rating, as the one closest to the transmitter (80 w, @53.15) didn't quite cut the mustard! A nice arc hole in the piston. Anyhow, was wondering what the working voltage is for these guys. Guess I need to look around for some substitutes. Thanks, Tim W5FN Utopia, TX [The entire original message is not included]
Re: [Repeater-Builder] Re: Piston Trimmer Voltage Rating
1/4 super flex makes a pretty decent gimmick capacitor. On Sun, Jun 27, 2010 at 10:16 PM, skipp025 skipp...@yahoo.com wrote: Instead of piston trimmers you might want to try ARCO padders (postage stamp size that can tolerate higher levels of rf current) or small air variable capacitors. I have nfound both at reasonable prices at this site: A generic statement that has merit in this subject Q is everything and the Q of an Arco cap (padder) is probably no where near as good as a decent piston cap. Ebay provides the occasional deal on nice piston caps. If you're not at a critical current location, the A49 piston caps in the following sale ad work for some applications. http://www.hamtronics.com/sale.htm s. http://www.danssmallpartsandkits.net/ 73 and aloha, Eric KH6CQ --- On Sun, 6/27/10, Tim tahr...@... wrote: From: Tim tahr...@... Subject: [Repeater-Builder] Piston Trimmer Voltage Rating To: Repeater-Builder@yahoogroups.com Date: Sunday, June 27, 2010, 11:18 AM Â Hi folks, Am just finishing up the 6 meter heliax duplexer project, and am getting some pretty good numbers. (3 'cans' on each side, 90dB notch about 1.2dB 'pass' attenuation).. Anyhow, I used some Johanson piston trimmers that I had, but evidently they are a bit shy on the working voltage rating, as the one closest to the transmitter (80 w, @53.15) didn't quite cut the mustard! A nice arc hole in the piston. Anyhow, was wondering what the working voltage is for these guys. Guess I need to look around for some substitutes. Thanks, Tim W5FN Utopia, TX Yahoo! Groups Links
Re: [Repeater-Builder] Quantar Simulcast Issue
Are the cables coming from the GPS reference are the same length at both sites? Also if these are VHF it could be that the reference frequency (channel spacing) is 5 kHz, if that is the case a harmonic of a paging tone might get past the audio pass band filtering 300 - 3000 Hz typically and is fooling the PLL divider. On Wed, Jun 23, 2010 at 1:01 PM, wmhpowell w...@att.net wrote: I'm looking for some Quantar engineering level help re: an interesting simulcast issue. I live in an area where I can hear several of high band our simulcast Quantars. The whole thing was installed and set up by Motorola including GPS stabilized time bases. I'm monitoring with a true monitor: wide band IF and little limiting. When the dispatcher drops a dead carrier I hear little in the way of hetrodyne or grunge as it should be. However, when the dispatcher drops alert tones I hear a hetrodyne that decreases in frequency over the duration of the tone. My guess is that the tone is somehow pulling one of the VCOs in a Quantar exciter because of a lack of DC restoration in the modulator: a capacitor is charging and slightly shifting frequency. I consider this to be abnormal and undesirable behavior - especially in a $y$tem of thi$ caliber. I haven't done any field tests yet. I suppose I can set up 2 service monitors: one to receive in the AM mode and the other to provide a reference carrier and then send tone to each transmitter, in turn. That, at least would let me isolate the problem to one, two, ?? radios. Has anyone else experienced a problem like this? Any Motorola engineers out there? Our local tech is also baffled so I'm reaching out for ideas. Thanks, Bill Powell Yahoo! Groups Links
Re: [Repeater-Builder] Quantar Simulcast Issue
Propagation delay in the coax. Get a dual trace oscilloscope and feed it with a 10 MHz GPS, off of a Tee and into 2 different lengths of coax. I could see the DC offset thing if the audio was coupled with a 1uF cap at one site and a 0.1uF at the other. Maybe I'm missing something here, but how the heck would the length of the cable from the reference oscillator to the transmitter/exciter matter? It's just the frequency reference (10 MHz or whatever) for the synthesizer; it has no effect on delay, phase, amplitude response, or anything else related to the modulated audio. Also if these are VHF it could be that the reference frequency (channel spacing) is 5 kHz, if that is the case a harmonic of a paging tone might get past the audio pass band filtering 300 - 3000 Hz typically and is fooling the PLL divider. This seems like a longshot. I think Bill's original guess is most likely on the right track - a DC offset problem. I'm assuming the transmitters are being modulated through a non-DC-coupled input to the modulator? Maybe look for a coupling cap with high leakage. Another thought is asymmetrical clipping of the audio. --- Jeff WN3A Yahoo! Groups Links
Re: [Repeater-Builder] Quantar Simulcast Issue
Well if the transmitters are running at the same frequency but at a different phase it is reasonable to expect that there would be some point where the 2 transmitters are at close to the same power level, but 180 degrees out of phase which should cancel out the receiver or at least make interesting noises. Well, yeah, I know what propagation delay is, but I don't see where the phase of the reference has an effect on anything. Are you thinking that the transmitter's RF carrier needs to be launched with phase coherence at each site? --- Jeff WN3A Yahoo! Groups Links
Re: [Repeater-Builder] transmission is intermittent and voice cuts out with my mc-micro repeater
Falsing of the DTMF decoder in the controller? Disable DTMF muting temporarily and see if the problem stops. On Sun, Jun 6, 2010 at 7:55 AM, mimomeg mimo...@yahoo.fr wrote: Seem to have period where my transmission (voice) cuts out for a few seconds every so often, and the person at the other end can't hear me. On the receiving end,Does anyone have any idea? Thanks in advance, Yahoo! Groups Links
Re: [Repeater-Builder] Re: Motorola Maxtrac for cw beacon
I'd cut the trace from the modulator section feeding the PLL so the TX has 0 modulation, Or you can try turning off the PL tone and grounding the mic pin. For keying I would jam PTT to ground, and switch the line that feeds switched B+ to the predriver stage of the PA. You could use just the PTT line but then you would have to wait the 50mS or so for the PLL to stabilize and the radio to make power.
Re: [Repeater-Builder] Antenna Separation UHF Low Power
Suitable 6 cavity Flat Pack mobile duplexers are in the $100 range on eBay. Thats probably cheaper than the feedline and second antenna. On Wed, Jun 2, 2010 at 5:10 PM, Chuck Kelsey wb2...@roadrunner.com wrote: Do your coverage tests with one radio at the repeater site and use simplex. Someone stays with the radio for the testing. Chuck WB2EDV - Original Message - From: Steve mill1...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 02, 2010 5:30 PM Subject: [Repeater-Builder] Antenna Separation UHF Low Power I am looking at putting together a 5w uhf repeater using 2 uhf m200s and a Rick we have on hand. We want to do coverage tests prior to investing in a duplexer, how far apart do we need to place our antennas? Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.829 / Virus Database: 271.1.1/2913 - Release Date: 06/02/10 05:57:00 Yahoo! Groups Links
Re: [Repeater-Builder] Sinclair duplexers
http://repeater-builder.com/sinclair/r101gc/r101_6m_mods.pdf On Mon, May 24, 2010 at 7:10 PM, n5sx...@charter.net wrote: Does anyone have a readable set of instructions to move a Sinclair R102G duplexer from 39 Mhz to 6M? I would like to get my repeater on the air ASAP and tuning the duplexers is all I lack. Thanks, Jeff N5SXQ n5sx...@charter.net Yahoo! Groups Links
Re: [Repeater-Builder] IFR 1600S Problems
Dont know for sure on the 1600, but for future reference the calibration password on the IFR-1900CSA is CSMATE which will have to be input from the keypad with the shift engaged. Apparently it is written in the service manual, which I don't have. With that said you should probably stay out of there without a service manual and another test set of known calibration. I'd suspect the caps getting weak in a negative voltage generator, look for a ICL-7660 or MAX1044. Or I'd try replacing the audio amplifier. On Thu, May 20, 2010 at 11:25 PM, burkleoj joeburk...@hotmail.com wrote: My IFR 1600S is giving me a couple problems. One is it appears to have some high frequency noise in the received audio, but the generated signal and audio looks and sounds clean. I am thinking maybe some caps in the power supply might be causing this problem. I have the three inch thick operators manual, but does anyone have a service manual for one of these beasts. I tried to run the calibration from the aux menu but I can not seem to find a password that the operators manual makes reference of. Any help or ideas would be most appreciated. Thanks, Joe - WA7JAW I tried Yahoo! Groups Links
Re: [Repeater-Builder] Duplexer notch blurred - why?
You are seeing the noise floor of the spectrum analyzer Either increase the generator strength or decrease the REF level, (Try -40dBm) On Wed, May 19, 2010 at 3:49 PM, Larry Horlick llhorl...@gmail.com wrote: -62 does seem a tad high. Describe the duplexer... On Wed, May 19, 2010 at 6:29 PM, Atlantis atlant...@gmx.ch wrote: Hi In the attached picture you see the notch of the 70cm duplexer I built according to W4NFR's description in QEX, those who can't receive attachments find it here: http://conturafm.mine.nu/_fh/438.95_notch.bmp The measurement has been made with both cavities of one branch connected with a true quarter wavelength jumper of RG58 because I had no double-shielded cable available. Can anybody tell me why the notch is this blurred and what can be done about it? The isolation would be a bit better if the notch was a clear sharp line, isn't it? Regards Martin
Re: [Repeater-Builder] PIC stuff at Hamvention?
Take a look at the Propeller Chip, New from Parallax. Has 8 independent processors on a shared bus. Cant rattle off the specs off the top of my head, but there is enough processor power to run a VGA display, run a RS-232 terminal, get keyboard input and encode/decode data at the same time.
Re: [Repeater-Builder] PIC stuff at Hamvention?
TT4 uses the ATMEGA644P. 64K Flash, 4K RAM, 2K EEPROM with dual hardware UARTS. On Mon, May 17, 2010 at 6:22 PM, Majdi S. Abbas m...@latt.net wrote: On Mon, May 17, 2010 at 09:16:32PM -0400, MCH wrote: Either that, or it was disinformation (although it's easy enough to verify - I just didn't want to pick up the TT4 and look at it since it was connected and operating). One of his products even has PIC in the name. I can confirm that the TT4 uses an ATMega... built version is SMT (but I've never handled one), the TT4 kit I built and am using is in DIP-40. I don't think a PIC would handle encoding/decoding, and KISS support along with the tracking code and the like. 73, Majdi, N0RMZ Yahoo! Groups Links
Re: [Repeater-Builder] Re: 220 equipment
Yeah, I could go for 1 or 2. I've got a bad habit of collecting weird 220 equipment, I've got both SEA and Linear Modulation Repeaters. On Tue, May 11, 2010 at 7:08 PM, NORM KNAPP nkn...@twowayradio.net wrote: I have (had) 4 if them. I was going to give them to Bill in Atlanta. I have not yet. I don't know if he needs or wants all of them. I could ask. 73 Norm - Original Message - From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Tue May 11 14:35:15 2010 Subject: Re: [Repeater-Builder] Re: 220 equipment Are there anymore of these available? On Sat, May 8, 2010 at 10:15 AM, NORM KNAPP nkn...@twowayradio.net mailto:nknapp%40twowayradio.net wrote: Bill, Give me a phone call about those 220 (217-219mhz) repeaters again. I would like to meet you in your area monday evening and drop those off. Thanks Norm N5NPO 251-234-0295 - 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: Wed May 05 17:36:08 2010 Subject: [Repeater-Builder] Re: 220 equipment They are useable for ham IF they are what I think you have described..The synth must be reverse engineered to get to ham freqs... I have begun this but not finished.we should talk offline... . bill --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , NORM KNAPP nkn...@... wrote: Tx is in the 217-219 range. I may end up with the 2 db228's as well. Are they usable for 220 ham? - Original Message - From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Wed May 05 08:50:06 2010 Subject: [Repeater-Builder] Re: 220 equipment Want to sell or donate them... they are FM and depending on if you have the base side or the boat side unit, it may be tx high or tx low. I am looking for the manuals for these units from the mid 1980's either the base or boat side. They were used on river boats mostly on the Mississippi River. Where are you located... . Bill Atlanta w4oo . . . . --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , NORM KNAPP nknapp@ wrote: I came across some 220mhz equipment and was wondering if it was good for anything... I got 3 Intech Incorporated COM 218 repeaters (?). Are these ACSB or are they FM? I also have some DB products circulators and a duplexer and a preselector TTA or something to that effect. 73... Norm Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Just curious... Microwave frequencies
Depends on the band. 2.0-2.2GHz is in the process of getting bought out by Sprint, so most of that equipment is worthless unless it will tune up to 2.4 GHz for use on ham. 7, 12, 24, and 36 GHz are commonly used for commercial applications 2.4, 3.4, 5.8 10 and 24 GHz are useful for amateur radio. On Wed, May 12, 2010 at 9:08 AM, La Rue Communications laruec...@gmail.comwrote: Is Microwave still in demand? I heard that they are an exclusive frequency mostly used by PGE in CA. Is the interest level for microwave bands nil? I have some microwave parts here and consider them junk as I have not heard much about microwave communications lately. John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] Just curious... Microwave frequencies
No 800 band for hams, closest is 902-928 which is the 33cm ham band, it is also used by ISM type devices such as cordless phones, baby monitors, 802.11 internet and wireless video senders. Sprint is just buying the 2.0 - 2.2 range, alot of the older stuff (licensed since the 60s) was on here. Its easy to pick out as the waveguide to the dish is about the size of a 2x4 and some dishes actually used regular Heliax. On Wed, May 12, 2010 at 9:19 AM, La Rue Communications laruec...@gmail.comwrote: Thank you Sir! So from what I understand Sprint is buying out the Microwave frequencies, and Nextel is re-structuring / re-banding the 800 MHz frequencies? Is there an 800 MHz ham band? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - *From:* DCFluX dcf...@gmail.com *To:* Repeater-Builder@yahoogroups.com *Sent:* Wednesday, May 12, 2010 9:14 AM *Subject:* Re: [Repeater-Builder] Just curious... Microwave frequencies Depends on the band. 2.0-2.2GHz is in the process of getting bought out by Sprint, so most of that equipment is worthless unless it will tune up to 2.4 GHz for use on ham. 7, 12, 24, and 36 GHz are commonly used for commercial applications 2.4, 3.4, 5.8 10 and 24 GHz are useful for amateur radio. On Wed, May 12, 2010 at 9:08 AM, La Rue Communications laruec...@gmail.com wrote: Is Microwave still in demand? I heard that they are an exclusive frequency mostly used by PGE in CA. Is the interest level for microwave bands nil? I have some microwave parts here and consider them junk as I have not heard much about microwave communications lately. John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] Just curious... Microwave frequencies
Generally microwave is used for point to point communications such as intercity links for telephone and studio to transmitter links for television and radio stations. The power generated by the transmitter is fairly low in the 10-100mW range but the antenna gain of a dish is extremely high 30-40dB depending on frequency and size of the dish, making a 100mW transmitter have an ERP that is 100 - 1000W. With that being said it is probably not a good idea to hang around the appreture of the dish while one of these systems is running. These frequencies are a challange because of the water vapor and rain really like to absorb them and with antenna gain that high the beam width is extremely narrow. I have a 6ft cookie that is .8 degrees wide. Longest path I saw was 65 miles on 12 GHz, had 15 foot dishes on both ends. Normal towers have a tendency to twist depending on wind and temperature variations so its a good idea to mount the dishes with super thick poles directly into the ground with concrete. The local cable company put a system on 24 GHz that went 1 mile. worked great until it rained and got humid, they mounted the dishes on wooden phone poles and they twisted to the point where the link quit working. On Wed, May 12, 2010 at 9:32 AM, La Rue Communications laruec...@gmail.comwrote: With that being said, how popular is the rest of the microwave band? Is it one of the more dangerous bands if used improperly? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - *From:* DCFluX dcf...@gmail.com *To:* Repeater-Builder@yahoogroups.com *Sent:* Wednesday, May 12, 2010 9:27 AM *Subject:* Re: [Repeater-Builder] Just curious... Microwave frequencies No 800 band for hams, closest is 902-928 which is the 33cm ham band, it is also used by ISM type devices such as cordless phones, baby monitors, 802.11 internet and wireless video senders. 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] Re: 220 equipment
Are there anymore of these available? On Sat, May 8, 2010 at 10:15 AM, NORM KNAPP nkn...@twowayradio.net wrote: Bill, Give me a phone call about those 220 (217-219mhz) repeaters again. I would like to meet you in your area monday evening and drop those off. Thanks Norm N5NPO 251-234-0295 - Original Message - From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Wed May 05 17:36:08 2010 Subject: [Repeater-Builder] Re: 220 equipment They are useable for ham IF they are what I think you have described..The synth must be reverse engineered to get to ham freqs... I have begun this but not finished.we should talk offline... . bill --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , NORM KNAPP nkn...@... wrote: Tx is in the 217-219 range. I may end up with the 2 db228's as well. Are they usable for 220 ham? - 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: Wed May 05 08:50:06 2010 Subject: [Repeater-Builder] Re: 220 equipment Want to sell or donate them... they are FM and depending on if you have the base side or the boat side unit, it may be tx high or tx low. I am looking for the manuals for these units from the mid 1980's either the base or boat side. They were used on river boats mostly on the Mississippi River. Where are you located... . Bill Atlanta w4oo . . . . --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , NORM KNAPP nknapp@ wrote: I came across some 220mhz equipment and was wondering if it was good for anything... I got 3 Intech Incorporated COM 218 repeaters (?). Are these ACSB or are they FM? I also have some DB products circulators and a duplexer and a preselector TTA or something to that effect. 73... Norm Yahoo! Groups Links
Re: [Repeater-Builder] Unidentified Micor Part
Looks like a VHF Micor Transmitter Low Pass Filter to me. On Tue, May 11, 2010 at 10:19 AM, La Rue Communications laruec...@gmail.com wrote: Need some help here. I have a Micor Part (I think) and the Motorola Code does not bring up anything at all on Google. From my guidelines, I know that this is a VHF Filter/Duplexer Part. The code is TFD6102APR. Pic is attached; One side has Input and Output on the opposide side to its respective receptacle if anyone knows what this doohickey is, I'd really appreciate knowing. :) Thanks! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] CTCSS Encoder/Decoder
Anyone got any FX-805J or MX-805J in the PDIP package? I built a 1000 Hz decoder once based on the 567, it would swing between 950-1070 depending on the mood it was in. The ATV guys use these to create a video squelch, looks at the frequency of the horizontal sync which is 15,374 Hz. Work fairly decent for that I understand. On Thu, May 6, 2010 at 8:22 AM, Ken Arck ah...@ah6le.net wrote: At 07:55 AM 5/6/2010, Stanley Stanukinos wrote: I must be missing something, there are several MFG of encoders/decoders still around. You are correct on the stability issue. You will find it much less frustrating to just buy off the shelf or get the one for your radio than trying to build one that is stable. Oh there is the cost of the new ones so that has to be figured in. We have CML Micro MX-828s in stock if the OP is interested in purchasing one or two (or 3 or 4 g). Contact me offlist about them. And yes, NE567's (or their derivatives) were never designed for use as a CTCSS decoder as they cannot possibly maintain the frequency stability (nor have the narrow bandwidth) required for that use. Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em! Yahoo! Groups Links
Re: [Repeater-Builder] Re: LDF1-50 with PL259 UG-176 ?
I've ran into some connectors where the shield is of the 3/8 is just barely too big for the connector. So what I do in that case is cut a slit in the shield and fold one side of the cut under the other side of the shield on and compress it slightly with pliers. Probably not the best thing to do from a impedance stand point but I have a UHF repeater running on a cable I did that to on both ends just fine with fairly close to 1.3 VSWR, which I'm blaming on the antenna, not the coax. Also some connectors just barely touch the vinyl jacket and the connector feels loose, A few turns of a quality electrical tape to the vinyl jacket of the coax will tighten things up a bit. On Tue, May 4, 2010 at 8:27 PM, Jeff DePolo j...@broadsci.com wrote: Depending on the PL-259 in question (i.e. who manufacturered it), sometimes you can get them onto FSJ2 without any problem, other times you need to take a bit off the threads to get it to thread onto the shield. But to complicate matters, some PL-259's are manufacturered such that the ID in the area where the solder holes are located is too small for FSJ2, in which case, you can't use those, unless you just thread them on up to where the ID tapers down, and then sweat-solder the shield to the PL-259 from the rear (i.e. you won't be able to solder through the solder holes). The center conductor fits into the PL-259 pin no problem regardless of manufacturer. Bottom line - try a few PL-259's and stick to manufacturer that works. If I could remember which ones do or don't fit I would tell you, but to be honest, I don't use PL-259's very often, so when I do need to put one on FSJ2, I usually just try a few until I find one that fits... --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Howard Z Sent: Tuesday, May 04, 2010 10:18 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: LDF1-50 with PL259 UG-176 ? DCFluX, So, you have placed a standard PL259 on Andrew FSJ2-50 3/8 cable? Any problems or advise? Howard --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , DCFluX dcf...@... wrote: Yes, I've done it. On Mon, May 3, 2010 at 7:25 PM, Howard Z howar...@... wrote: I found some more specs: fsj1-50a diameter over dielectric 0.190 inner conductor OD 0.0750 Outer Conductor OD 0.250 fsj2-50 diameter over dielectric 0.280 inner conductor OD 0.1100 Outer Conductor OD 0.380 fsj4-50b diameter over dielectric 0.350 inner conductor OD 0.1400 Outer Conductor OD 0.480 ldf1-50 diameter over dielectric 0.270 inner conductor OD 0.1000 Outer conductor OD 0.310 ldf2-50 diameter over dielectric 0.340 inner conductor OD 0.1200 Outer Conductor OD 0.380 So, it looks like both FSJ2-50 and also LDG2-50 have an outer conductor OD of 0.380 inch. Do you think these cables might be able to use regular PL-259 connectors without any reducer? Howard Yahoo! Groups Links 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: 05/04/10 02:27:00 Yahoo! Groups Links
Re: [Repeater-Builder] Re: 220 equipment
Can some one take pictures of these? On Wed, May 5, 2010 at 4:28 PM, NORM KNAPP nkn...@twowayradio.net wrote: Give me a ring at 251-234-0295 - Original Message - From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Wed May 05 17:36:08 2010 Subject: [Repeater-Builder] Re: 220 equipment They are useable for ham IF they are what I think you have described..The synth must be reverse engineered to get to ham freqs... I have begun this but not finished.we should talk offline... . bill --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , NORM KNAPP nkn...@... wrote: Tx is in the 217-219 range. I may end up with the 2 db228's as well. Are they usable for 220 ham? - 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: Wed May 05 08:50:06 2010 Subject: [Repeater-Builder] Re: 220 equipment Want to sell or donate them... they are FM and depending on if you have the base side or the boat side unit, it may be tx high or tx low. I am looking for the manuals for these units from the mid 1980's either the base or boat side. They were used on river boats mostly on the Mississippi River. Where are you located... . Bill Atlanta w4oo . . . . --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , NORM KNAPP nknapp@ wrote: I came across some 220mhz equipment and was wondering if it was good for anything... I got 3 Intech Incorporated COM 218 repeaters (?). Are these ACSB or are they FM? I also have some DB products circulators and a duplexer and a preselector TTA or something to that effect. 73... Norm Yahoo! Groups Links
Re: [Repeater-Builder] Programming Kenwood TKR-820 without KPT-50
Brute Force Hacking the TKR-820 / 720 Series Hey, these make great little repeaters. They also are becoming fairly common on the surplus market as companies are caving into the idea that digital cellular is a better alternative to NBFM. Well anyway I am sure you bought one for cheap or acquired one by some other means with the thoughts that you could drag it into the ham band. So lets begin. First lets make sure the repeater works. Start by connecting a watt meter with dummy load to the TX port (Or the antenna port on models with the built in duplexer). Use the 25W 200-500 or 400-1000 slug are the closest thing you have. Loosen the squelch until the repeater goes into transmit mode, remember to press the repeat button on the front panel. Won’t do it? Turn the unit off pull the covers and remove the 93C46 EEPROM from the controller board (This is the little board that is about 3X5 and sits above the radio chassis’). This sets the DPL/PL combination and without it the repeater will activate on COS. Turn it back on and it should repeat. Got RF power? Good. Set this little bastard aside as we will deal with him later. Next step is to take write down the voltage on the from the test points besides the VCOs. The VCOs are located under the metal tray that the controller sits on. This should be some where around 4 volts DC. Now we have to come up with a way to change the data that sets the frequency of the repeater. For some reason the chip that does this is on the circuit board on the front panel of the repeater. I was originally told that “Either a KPT-20 or KPT-50 is need to program those. No way around it.” That sounds like a wager to me. Sure if you have a Kenwood dealer around that you can borrow one from or willing to spend more than you bought the repeater for this is a sure fire method. Oh, you will also need the KPG-21D software, but it will not allow operation into the ham bands and has some serious compatibility issues running on modern hardware. Unsolder the 93C46 EEPROM from the front panel board. Use what ever method you like, I prefer my trusty static free Soldapult. Be careful not to rip and leads off the package when removing it. Place an 8 pin DIP socket in the hole that you got the EEPROM out of and solder it down. Now we get the data out of the chip. I built a serial port to EEPROM interface found here: http://www.lancos.com/e2p/siprog_base.png and http://www.lancos.com/e2p/si-prog-v2_2.pdf in order to be used with the device programming software “Pony Prog” http://www.lancos.com/prog.html. You have to build the base board and then the socket for the device you wish to program. I replaced the LM2936Z-5 in the schematics with a 5.1 V Zener diode fed with a 330 ohm resistor to generate the +5 needed, and BC547 is the European equivalent of a 2N3904. This way all parts can be obtained from your local Radio Shack, or your parts box depending on how much home brew you do so well. So once you have the interface built and running you can read the EEPROM contents. The settings take a little while to get used to. All you want it to output to is a raw binary dump with no header information saved. Open the dump with a hex editor. I like XVI32, http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm . Pretty hard to beat free. Now for some reason the Pony Prog spit out information that is interleaved. This is evident by the way the data is arranged at H7A, Which on my dumps is 8R021N. On a Kenwood KPG-21D generated image this should say R820N. Anyway, it makes the hex coding easier to understand when doing the channels. If you are using a different chip program that did it right you will have to swap the bytes around, i.e C884 to 84C8. It should be obvious when you do the calculations and your frequency is in the 650MHz region. Receiver frequency data starts at H00 and it 2 bytes long. In my binary image I have H8338. Open up the windows calculator and place it in scientific mode (Or you can use a decent calculator that will convert Hex to decimal such as the TI-36X.). Press the “Hex” button and enter in the data that you have. Then press “Dec”. H8338 = 33592. Now we multiply this by the channel stepping. 12.5 for the TKR-820 and 5 for the VHF 720. 33592 * 12.5 = 419900. Now we add the IF frequency 419900 + 21400 = 441300 441.300MHz. You still with me? Good. The transmit side is the exact same thing, but starts at H02. I find this odd that both the transmit side and the receive side use IF frequencies on the synthesizers, but what ever. Now that you have reverse engineered what channels the repeater is on, Stick that chip back in there. You get to do…. More testing. If you have the internal duplexer now would be a good time to bypass it and go straight into a watt meter and dummy load. If you are satisfied with the repeaters performance you may continue to changing the frequency. Figure out the target frequency you want and we will go from there. 443.400MHz RX 443400 –
Re: [Repeater-Builder] LDF1-50 with PL259 UG-176 ?
Try the reducer meant for RG-8X. On Mon, May 3, 2010 at 11:21 AM, Jeff DePolo j...@broadsci.com wrote: Hi, I have read that one can put plain low cost PL259 connectors on FSJ1-50A Andrew 1/4 inch suplerflex using a UG-176 reducer. Yep. Can the same be done with the Andrew LDF1-50 1/4 hardline? Nope. The OD of the shield is too big to fit into a UG-176 reducer. FSJ1 is exactly a quarter inch OD without the jacket. LDF1 is 0.31. A UG-176 reducer is designed to fit over RG8X, RG59, et al which are typically 0.242 OD. You can usually coerce the reducer onto FSJ1, but you'd have to drill it out bigger to fit LDF1 into it. --- Jeff WN3A Yahoo! Groups Links
Re: [Repeater-Builder] LDF1-50 with PL259 UG-176 ?
Ahh, right you are. Thats one of those things that you never refere to by the proper name around here. How about doing it without a reducer at all then? According to this the dielectric size of RG-8 is 0.285 and LDF-1 is 0.29 Cant find the dimensions of the shield of RG-8 but it brings the size of LDF-1 to 0.30 which should fit nicely inside a PL-259. On Mon, May 3, 2010 at 2:11 PM, Jeff DePolo j...@broadsci.com wrote: A UG-176 *is* a reducer for RG-8X.
Re: [Repeater-Builder] Re: LDF1-50 with PL259 UG-176 ?
Yes, I've done it. On Mon, May 3, 2010 at 7:25 PM, Howard Z howar...@yahoo.com wrote: I found some more specs: fsj1-50a diameter over dielectric 0.190 inner conductor OD 0.0750 Outer Conductor OD 0.250 fsj2-50 diameter over dielectric 0.280 inner conductor OD 0.1100 Outer Conductor OD 0.380 fsj4-50b diameter over dielectric 0.350 inner conductor OD 0.1400 Outer Conductor OD 0.480 ldf1-50 diameter over dielectric 0.270 inner conductor OD 0.1000 Outer conductor OD 0.310 ldf2-50 diameter over dielectric 0.340 inner conductor OD 0.1200 Outer Conductor OD 0.380 So, it looks like both FSJ2-50 and also LDG2-50 have an outer conductor OD of 0.380 inch. Do you think these cables might be able to use regular PL-259 connectors without any reducer? Howard Yahoo! Groups Links
Re: [Repeater-Builder] Strange Signal on 158.275(ish)
Didn't get enough of it, but I would that might be a prime number sequence like in the movie Contact. See what you get in on UHF Channel 37 (608-614 MHz) which is nationwide reserved for radio astronomy.
Re: [Repeater-Builder] Re: Interference from local 600 kHz radio station.
Try this Force the repeater transmitter on. Walk around with a hand held that has a CW mode, such as a TH-F6A tuned to the repeaters input frequency and get a detailed map of the area and note the S meter readings.
Re: [Repeater-Builder] COR signal from ICOM 37a
Didnt those have a green LED on the front panel for COR? On Mon, Apr 26, 2010 at 9:07 PM, Robert McNeill rob...@ncbfi.org wrote: I want to link two repeaters together and have a couple of Icom 37a 220 rigs on the shelf. I have been searching for info on the best place to grab a signal to drive a COR. Does anyone have any info on this? Thanks!! 73 K5ILS Robert
Re: [Repeater-Builder] Interference from local 600 kHz radio station.
Change the split of the repeater to anything other than 600 kHz. On Sun, Apr 25, 2010 at 8:06 PM, lpcoates bruce.coa...@sasktel.net wrote: Hi We have a local AM radio station on 600 kHz. Their transmitter site is about 10 miles from the center of the city. From what I've found on the web, they run 25,000 watts during the day and 8,000 watts at night. On at least one of our repeaters we're finding that this is mixing with the output of repeater to create a phantom signal exactly on the input. We're not sure whether the mixing is happening inside the repeater or in something in the environment near the repeater. We've confirmed this is the source of the problem on one repeter and supect it on another. Has anyone had experince with a loacl AM station on 600 kHz? We're looking for way to combat the interference. Thanks Bruce - VE5BNC Yahoo! Groups Links
Re: [Repeater-Builder] OT:Antenna height restrictions and PRB-1
Around here the County doesn't care about towers, as long as they are 40' and under and will fall on your property.
Re: [Repeater-Builder] question for Group on Mastr III
I do not believe there is a factory pre-amp made for this unit. I believe factory spec is 0.35uV for 12dB SINAD. If you decide a pre-amp is needed I'd stay away from the super high gain GaAs FET type. I'd go with something in the 6 - 12dB gain range preferable with a helical front end. On Mon, Apr 19, 2010 at 6:36 PM, Joe Landers ke4...@ke4eue.org wrote: Hello everyone Would like to know for a report if there is such a item available. I need to know if there is a preamp for receive for a G.E. Mastr III vhf in ham band 146.xxx. This is part of a recommendation I need to submit and you guys know the answer a lot faster than me trying to find it . Thanks Joe Landers Ke4eue
Re: [Repeater-Builder] Identify Please
It is a dual stage circulator. Attach dummy loads to the bottom connectors and sweep it with the generator on the antenna side and the detector on the transmit side, you should see about a 40-60dB dip on the frequency it is tuned for. On Fri, Apr 16, 2010 at 2:11 PM, La Rue Communications laruec...@gmail.comwrote: Ran across a box of 5 or 6 of these units. Have no idea what they are aside from being a CelWave R.F product. If any of you have one of these, maybe you can tell me what it is, and what bandwidth it would be for. Right now, its my *guess* that its an 800 band contraption. Thanks for your insight! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
Re: [Repeater-Builder] Identify Please
They may stretch up to 902-928 Ham. On Fri, Apr 16, 2010 at 2:33 PM, La Rue Communications laruec...@gmail.comwrote: Thanks all for the speedy responses. I found one more (with a tag to boot!) assuming they are all the same, they are Model CD800-F, tuned to 875.00 MHz. Ugh, more 800 crap for the junkpile! Is it wrong to be cursing Nextel? I will probably be sweeping it with a generator and make sure these are all the same. With the tag, it should be cake. John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 - Original Message - *From:* tsoli...@tir.com *To:* Repeater-Builder@yahoogroups.com *Sent:* Friday, April 16, 2010 2:21 PM *Subject:* Re: [Repeater-Builder] Identify Please Looks like a two stage circulator. One port is for input one for output and the other two (that come out the same side) are terminated into 50 ohm dummy loads. Unknown what frequency range, probably 800-900 range, just guessing. tom -Original Message- From: La Rue Communications Sent: Apr 16, 2010 5:11 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Identify Please Ran across a box of 5 or 6 of these units. Have no idea what they are aside from being a CelWave R.F product. If any of you have one of these, maybe you can tell me what it is, and what bandwidth it would be for. Right now, its my *guess* that its an 800 band contraption. Thanks for your insight! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
Re: [Repeater-Builder] Identify Please
I might be a little wrong because I dont have one in front of me, but try this: Connect the Generator of a spectrum analyzer to the connector all the way to the right. Connect a dummy load to the connector on the bottom left. Connect the detector to the connector all the way to the left. You should see a dip where the port is currently tuned. Try moving the adjustment screw next to the port with the dummy load on it. Outwards should increse the frequency. Note how far up it will come. Then Rotate the connectors so that dummy load is all the way left, detector all the way right and generator bottom left. Tune next capacitor and repeat. Then you can do basically the same for the next stage. Check this sheet out: http://www.repeater-builder.com/db/pdfs/db-dual-junction-tunable-isolators-field-tuning-instructions.pdf
Re: [Repeater-Builder] Duplexer parts
http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html (CAV) 167-205-71 sounds close to it. On Thu, Apr 15, 2010 at 11:59 AM, Gary Hoff k7ney...@q.com wrote: I have an old Phelps Dodge VHF Duplexer that has a frozen air variable. The Duplexer is a part# 499-509 and covers 144-174. The air variable in question is stamped 167-202 and is split stator about 1 3/8 square. Anybody know where I might find a suitable replacement, I haven't had any luck where I've been looking. Gary K7NEY Yahoo! Groups Links
Re: [Repeater-Builder] Xtals for Mastr ExecII
I would blame the tempreture compensation line that is going into the ICOM before the crystals. Please refer to the schematic on page 7 of: http://www.repeater-builder.com/ge/lbi-library/lbi-30060d.pdf I believe this line is typically in the 4 to 5v range On Sun, Apr 11, 2010 at 1:57 PM, Lee Pennington localjunkpedd...@gmail.comwrote: Crystek, And Jans, Both in Fort Myers, Fl..73 On Sun, Apr 11, 2010 at 3:01 PM, John k...@bellsouth.net wrote: Well it looks like I need a new tx xtal for my UHF ExecII repeater. The current xtal has suddenly jumped about 50KHz high on UHF What are the current prefered vendors? I know about International, any other reliable ones? John -- John Mc Hugh, K4AG Coordinator for Amateur Radio National Hurricane Center, WX4NHC Home page:- http://www.wx4nhc.org -- Always drink upstream from the herd.
[Repeater-Builder] Linear Modulation EPROM files
Working on converting a Linear Modulation (Similar to ACSSB) 220 Trunking repeater to Amateur Radio applications, but I need your help. I am experimenting with a LMC3005 repeater, also known as the Viking LX. I believe the RF and Signal processing boards are similar to the ones found in the LMM3115 mobile radio if that is what you have. Possible suspect brands of manufacture are: Intek Global Linear Modulation Technology Midland Securicor Radiocoms Pty. Ltd. RoameR One EF Johnson For some reason the repeater I have is missing the EPROMs from the Trunking Channel Controller module. It is the one that has the 7 segment display and LEDs that sits in between the Exciter and Receiver modules. It is labeled They are labeled IC13, IC20 and IC21. 13 and 20 should be a 27C256 and IC21 is a battery backed up clock module M48T18. If anyone has a fuctional repeater I'd appreciate it if you could read the data off the EPROMs and send them to me. Also if anyone has a functional LMM3115 mobile radio I would be willing to buy that too.
Re: [Repeater-Builder] Linear Modulation EPROM files
Can you power one up and see what the display says? Mine all show and have a solid squelch that blinks off about once every 2 seconds. Maybe there is something critical in the RAM module and the battery went dead. As I understand it there is an elaborate power up thing that gets displayed. and the switches should be functional. Holding mode down during power up should make the module run in a diagnostic mode.
Re: [Repeater-Builder] Motorola Micor Part TCN1383A
They appear to be tripler / 2W amplifier sections from the Micor station. Possibly UHF. If its like the 2W UHF version you can disconnect and sweep the filter that is attached to the lid with a spectrum analyzer and that will tell you what frequency it is for. On Thu, Apr 8, 2010 at 8:23 AM, La Rue Communications laruec...@gmail.com wrote: Not sure if the pics will show up on the Group List, but here goes. John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 - Original Message - From: wd8chl wd8...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Wednesday, April 07, 2010 1:42 PM Subject: Re: [Repeater-Builder] Motorola Micor Part TCN1383A On 4/7/2010 4:31 PM, DCFluX wrote: Lets get some pictures Well, TLF would indicate 800 MHz... On Wed, Apr 7, 2010 at 1:12 PM, La Rue Communications laruec...@gmail.comwrote: Eric, No results as the Parts Department says they're obsolete. Duh – tell me something I dont know. I was not able to get any info on the remote chassis, and two triplers that I have. TLF1053A and TLF1332A. Sorry I could not report better news. I will just keep scavaging unless someone else on the RB list has a similar model and can share what they know... Anyone? Bueller? Bueller? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 - Yahoo! Groups Links Yahoo! Groups Links 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: Problems reaching the RB website sigh
According to the why page: Malicious software is hosted on 1 domain(s), including imgdownloads.com/. Sounds like its angry because of a picture in an article is hosted there. On a related note our 8e6 web filter here at the shop 8e6 also classifies imgdownloads as malicious/virus
Re: [Repeater-Builder] Re: Problems reaching the RB website sigh
Sorry it does not specify where it saw that link. On Thu, Apr 8, 2010 at 12:10 PM, Mike Morris WA6ILQ wa6...@gmail.com wrote: Do you know which photo in which article? Mike WA6ILQ At 11:53 AM 04/08/10, you wrote: According to the why page: Malicious software is hosted on 1 domain(s), including imgdownloads.com/. Sounds like its angry because of a picture in an article is hosted there. On a related note our 8e6 web filter here at the shop 8e6 also classifies imgdownloads as malicious/virus Yahoo! Groups Links
Re: [Repeater-Builder] new Topic
Sounds like the PLL is out of lock on that band On Thu, Apr 8, 2010 at 1:39 PM, Lee Pennington localjunkpedd...@gmail.comwrote: Hi guys, Since I can't address the site, I'd like some info into solving a problem with my 10 M beacon: Realistic HTX 100 It's been on the air flawlessly and continuously, (28,2883 Mhz @ 5W) for several years. About a week ago I turned it off to get in on a little 10 meter DX, myself. Upon restarting, the rig was locked up, and the display was flashing 28.3183. The normal unlock procedure restored the frequency readout to 28.000, but it still was flashing and still locked up. None of the function controls other than; on/off, volume, squelch, and RF gain, seem to work either. Any ideas?? I fully realize that this will be laughed at by many, but the link to the RB site is inaccessable to me right now. Thanks in advance for any suggestions. de Lee K4LJP 73 On Thu, Apr 8, 2010 at 3:52 PM, Tim Ahrens tahr...@swtexas.net wrote: Oops, sorry guys, I just replied to Mort... I meant to do it to his own e-mail. Sorry. Tim W5FN -- Always drink upstream from the herd.
Re: [Repeater-Builder] Motorola Micor Part TCN1383A
Lets get some pictures On Wed, Apr 7, 2010 at 1:12 PM, La Rue Communications laruec...@gmail.comwrote: Eric, No results as the Parts Department says they're obsolete. Duh – tell me something I dont know. I was not able to get any info on the remote chassis, and two triplers that I have. TLF1053A and TLF1332A. Sorry I could not report better news. I will just keep scavaging unless someone else on the RB list has a similar model and can share what they know... Anyone? Bueller? Bueller? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 -
Re: [Repeater-Builder] Looking for manual for Celwave 526-4-2
The ones I have were a little bit hinky until I lengthened the jumpers approx 3/4. On Sun, Apr 4, 2010 at 10:30 AM, Ken Arck ah...@ah6le.net wrote: I have one I'm retuning and it's acting hinky on the notch tuning. Guess I need their instructions Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em! Yahoo! Groups Links
Re: [Repeater-Builder] Nice article on the Molotora Gontor
I pre-ordered one on March 32, hope its shipped soon.
Re: [Repeater-Builder] Someone want to spot me?
Remove one of the coupling loops and replace it with a metal hole plug, the cavity will then turn into a notch. Place either 1/4 electrical wavelength cable or 1/2 wavelength between the Tee and the cavity if you desire a high pass or low pass peak to the notch. On Thu, Apr 1, 2010 at 9:40 AM, Ken Arck ah...@ah6le.net wrote: Thanks for the replies folks - some good ideas. I should have clarified that the spare T-1500 cavities I have are BP only. And my plan is to use it as a suck-out (notch) filter. That is why I was talking about using a T in line with the receive line. Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em! Yahoo! Groups Links
Re: [Repeater-Builder] Helix / Connectors
The connectors should be fine, I wouldn't trust the aluminum feedline. You may want to try using an anti-oxidation compound, such as No-Ox or Aluminum Ox-Gard during assembly. On Mon, Mar 29, 2010 at 2:36 PM, Eric Lowell elowell9...@yahoo.com wrote: LDF4 with the non-plated connectors, well waterproofed, will last a decade+. GL de W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469
Re: [Repeater-Builder] Helix / Connectors
I'll have to ask a cable guy what they do, but all of the connectors for the aluminum hardline I have seen are aluminum as are the housings of the amplifiers, so the dissimilar metals issue does not exist 95% of the time in the cable TV world. In the RF world that is another story, I just took the silver plated coupling loops out of a Sinclair aluminum cavity and it was covered in a fine white powdery scale where the connector made contact with the can which I am going to assume is Aluminum Oxide, don't really have the resources to have it analyzed. On Mon, Mar 29, 2010 at 6:16 PM, Joe k1ike_m...@snet.net wrote: I don't think I would use any kind of compound on RF connectors. I went to the RFS aluminum CELLFLEXŽLite training and no compound was recommended. Now, I'm not a fan of aluminum cable, but if it's going to be used I would use only manufacturer recommended connectors, no compound, torque the connector properly (this does not mean white knuckle tight), and properly weatherseal the connection. Proper installation techniques need to be followed so as not to crush or kink the cable. 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] Controller order PayPal problems
Didn't eBay ban this method as they werent getting their double dip through Paypal? I refuse to use paypal due to privacy concerns (they have been known to sell personal information in the past.) This is just more ammo against using them. Frankly, if someone won't take a USPS money order, then they just don't want to sell.
Re: [Repeater-Builder] Controller order , paypal problems
I'll chime in, Paypal inadvertently sent a transaction twice withen 4 seconds of each other. After holding for 30 minutes the asian lady on the phone said there was nothing she could do as the transaction already went through and I'd have to contact the seller and ask to refund one of the transactions, which is funny as both were for the same amount and no I did not hit the send button twice.
Re: [Repeater-Builder] E.F. JOHNSON radio
EF Johnson Challenger 7152A? VHF 55W http://www.repeater-builder.com/johnson/efj-index.html http://www.ccdx.org/zedyx/mods/challenger.htm On Tue, Mar 16, 2010 at 3:43 PM, Doug ap...@sasktel.net wrote: I have a vhf radio presently on 162mhz made by E.F Johnson. It is a small unit, but I can't find a combo. It has a FCC ID ATH90F2427152. The number is very faded and hard to read. Can anyone tell me anything about these. Are the useful for hams and how can they be programmed. Thanks Doug VE5DA Yahoo! Groups Links
Re: [Repeater-Builder] Re: MSR2000 UHF exciter (update)
Dont know the dimensions of the filter, but perhaps you should try replacing the tunning slugs with brass screws of the same threading that are longer as well. On Wed, Mar 10, 2010 at 4:39 PM, Thomas Oliver tsoli...@tir.com wrote: Not knowing what the MSR filter looks like I wonder if you could kludge a Micor exciter filter in there somehow? tom
Re: [Repeater-Builder] Re: Commercial-Grade Repeaters for 6m
Why not just buy a retired GE MASTR-II station and convert it? If your looking for something synthesized you might try Spectra Engineering Pty. Ltd. They could probably make a Band A3 39-50 MHz MX-800 play on 6m ham.
Re: [Repeater-Builder] Re: Interference
Please provide make and model of repeater, controller, duplexer and input frequency.
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
2.4 GHz, there are numorous TV transmitters already designed that operate here, 2 of the 4 channels common channels fall on the ham band and are often converted for ATV use. On Thu, Mar 4, 2010 at 12:42 PM, MCH m...@nb.net wrote: The premise is common sense, but, as you say, this is the government. Where would *you* put TV transmitters if not in the TV bands? Joe M. David Jordan wrote: I don't think there is any premise or as you say, ...fact that it should be in the bands where TV is authorized... is relevant. Where the FCC decides to put it is where the fact. Yahoo! Groups Links
Re: [Repeater-Builder] Re: Interference
PRO5100 = 44.85 MHz 1st IF with High Side Injection, 455kHz 2nd IF, 16.8 MHz TCXO What is the frequency of the repeaters transmitter? On Thu, Mar 4, 2010 at 12:48 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: The repeater consists of (2)Motorola Pro 5100 Radios, one in transmit, and one in receive, the controller is a CAT 250, the duplexer is a Wacom 641, the Antenna is a DB 224E, and it is powered by an Astron 50 Amp supply. Hope this helps. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of DCFluX Sent: Friday, March 05, 2010 2:08 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference Please provide make and model of repeater, controller, duplexer and input frequency. Yahoo! Groups Links
Re: [Repeater-Builder] Re: Interference
About the only IMD product I can come up with is this one 16.8 + (8 x 146.76) - (6 x 191.01) = 44.82 MHz Which is the TCXO + 8th harmonic of TX - 6th harmonic of RX VCO to land close to the 1st IF pass band. I think the lack of filtration in this model of radio might be suspect as it uses varactor tuned strip lines. The probably offer minimal selectivity and they might not be optimized for ham band as they are voltage controlled and the radio might not be optimized for this frequency (it will program but moto cant guarantee the specifications). I'd try the notch coax stub as on your feedline as someone else suggested. On Thu, Mar 4, 2010 at 2:56 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: 146.760 Mhz. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of DCFluX Sent: Friday, March 05, 2010 5:54 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference PRO5100 = 44.85 MHz 1st IF with High Side Injection, 455kHz 2nd IF, 16.8 MHz TCXO What is the frequency of the repeaters transmitter? On Thu, Mar 4, 2010 at 12:48 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybaptiste%40spiceisle.com wrote: The repeater consists of (2)Motorola Pro 5100 Radios, one in transmit, and one in receive, the controller is a CAT 250, the duplexer is a Wacom 641, the Antenna is a DB 224E, and it is powered by an Astron 50 Amp supply. Hope this helps. -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 DCFluX Sent: Friday, March 05, 2010 2:08 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference Please provide make and model of repeater, controller, duplexer and input frequency. Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Until they start bringing up ATV repeaters, The common input frequencies are 439.25, 434.0, 433.25, 427.25 and 421.25. Now, see the channel assignments for the analog video? Since the video carrier is 1.25 MHz above the bottom of each channel, we can predict where most of the energy is going to fall: 437.25, 443.25 431.25, in descending order of occupancy. If your input isn't near one of those frequencies, you're probably never going to hear from one. The real problem will be us interfering with the Scout RX. Bob NO6B Yahoo! Groups Links
Re: [Repeater-Builder] Fw: FCC RO Involving the Amateur 70cm Band
Take that crap up to 2.4 GHz with the rest of the garbage.
Re: [Repeater-Builder] RBI-1 Problem
Wrong channel stepping on the radio it is connected to? On Wed, Mar 3, 2010 at 2:08 PM, gibsn406 gibsn...@yahoo.com wrote: My RBI-1 was working. Now what ever command you ask it to doit jumps the frequency of the radio 15kc. Reset does not help. trying to even change the power setting only causes the RBI kenwood receiver to go up 15kc. Every command sent just compounds the display frequency by 15kc. When a reset is done it goes through its dance and looks ok there. Has anyone ever experienced this problem and know what the cure is??? Thank you Yahoo! Groups Links
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Got the auction number? On Wed, Mar 3, 2010 at 9:30 PM, wa1nh wa...@arrl.net wrote: UMM.. Was just perusing eBay. Guess what I found Search on Recon Scout in cameras an photos! Is this the same device? So much for part 90 licensing. Jason, WA1NH --- In Repeater-Builder@yahoogroups.com, MCH m...@... wrote: Except for the fact these users will be SECONDARY to US. Still, try telling your local PD they have to shut their robot down because they are causing interference... Joe M. Nate Duehr wrote: Amateur Radio is NOT PRIMARY on 70cm in the U.S.. Never have been. Never will be. We are SECONDARY ...and NTIA let's us behave like we're primary... most of the time. That's why we lost with previous military systems (ask folk near Camp Pendleton about that one), we lost with PAVE PAWS, and we'll probably lose on this one too. Nate WY0X Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
On that note I should point out that most explosives devices don't like being exposed to RF. And AM NTSC video tends to get into a bunch of stuff with the sync pulses. I think this warning appears in most mobile radio manuals and is posted around blasting sites. On Wed, Mar 3, 2010 at 10:12 PM, iuzpetnrdx2000 petn...@sbcglobal.net wrote: Actually the DOD has been using these for some time and several bomb disposal robots used higher power than these in the 440 band. I know, I had and used several before retiring. I am not worried as much about the interference to US. Weak signals and short duration events. What I am more concerned about is the Public Safety Officials wanting to arrest a Ham that just happens to be at a scene using his/her 440 HT, and apparently causing interference to a bomb disposal or Haz-Mat team using one of these things. As you might guess, they are not the most robust RF link and Cops being Cops, they won't know that THEY have to suffer the interference. Likely the sales people won't make a point of that. Nor will anyone pull the RF equipment when these things go to surplus for auction. I am afraid these might be bigger problems. All in all it was such a bad decision to allow on 440. Yahoo! Groups Links
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
How about a 7809 regulator IC with a 1N4004 diode in the ground leg to raise the output voltage to 9.6V? I was envisioning mounting it to something metal for heatsinking purposes, but I guess you could probably use one of the screws on the backplane plus a little TO220 heat sink. Whatever works...and doesn't make smoke. --- Jeff Yahoo! Groups Links
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
In that case Just a straight 7809 or 7810 also would not require isolating the tab and can be mounted straight to the metal chassis. If it were me, I'd just use a 9 or 10 volt three terminal regulator (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg deal. It only serves to make the circuitry more involved , harder to mount, and for NO advantage whatsoever. Kevin Custer
Re: [Repeater-Builder] Repeater Controller ACC RC-85
Don't know who you talked to over there but here is the link for it off of their own website... http://www.link-comm.com/ftp/acc/rc85.zip On Tue, Feb 23, 2010 at 1:02 PM, felix rosasco felixp...@yahoo.com wrote: Hello to all, Any one knows where to get the Software upgrade for the controller RC-85? Linkcomm told me they don't have it. Thanks 73, Felix, KC7WVE
Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?
How about 1.25 MHz RF coming down the outer jacket of the UHF antenna and into the ground of the system? You have about 200 ft or so of coax? Try a mag mount antenna temporarily. Not really sure how you'd cure that though. Not sure if snap on RF beads would work on coax with a signal going in the center.
Re: [Repeater-Builder] 220 MHz Duplexers for sale MUST GO
I'd be intrested in one or both of the duplexers, would you take $50 and $20 shipping each? On Mon, Feb 22, 2010 at 11:50 AM, bbfmrf bbf...@yahoo.com wrote: I placed the following post regarding a pair of 220 MHz duplexers and received a few interest messages, but after the initial messages, there was no follow up. I need to get rid of these items, so I am reposting the message with the following deadline. I will accept the best offer PLUS shipping for these items between now and Thursday morning. If no one is interested in these items, they will be disposed as scrap. As stated, they are sold AS IS and I have no technical specs on the equipment. ORIGINAL POST: I have a pair of Aerial Facilities Limited Duplexers and a signal amplifier available to anyone interested. This equipment was removed from a site and I have no use for it, so I am making it available to anyone interested. I have no data on this equipment, nor can I make any claims as to its functionality, so it is being made available AS IS. Pictures of the equipment are located in the photo section for this group in the album BBFMRF under the names AFL220A thru AFL220G. I can also supply more detailed pictures upon request. If anyone out there has any data on these products and wants to supply addl information, please feel free. I really have no idea on value, so I am making it available at best offer plus shipping. Contact me OFFLINE regarding interest or additional questions. Yahoo! Groups Links
Re: [Repeater-Builder] Can the 4th harmonic of 1250 AM keep UHF repeaters locked up?
If you have a spectrum analyzer, look at the receiver pass side of the duplexer, you should see the garbage come up as soon as the transmitter keys. Also if you do not modulate the repeater the garbage should be decode able with a radio such as the Kenwood TH-F6 or Yaesu VX-7 set to AM mode tuned to the repeaters input frequency. You will also see garbage on the opposite offset. if it is a 5MHz mix. You should be able to walk around with the handheld and look at the S-meter to find the mixer.
Re: [Repeater-Builder] manual and service manual scanning (digitize to PDF)
ARCsoft Scan and Stitch is what I used. On Fri, Feb 19, 2010 at 12:41 PM, Robert Pease r...@jfcsonline.com wrote: All Hail GIMP *From:* Repeater-Builder@yahoogroups.com [mailto: repeater-buil...@yahoogroups.com] *On Behalf Of *Benjamin L. Naber *Sent:* Friday, February 19, 2010 2:39 PM *To:* Repeater-Builder@yahoogroups.com *Subject:* [Repeater-Builder] manual and service manual scanning (digitize to PDF) For those whom are scanning manuals, what program is used to mosaic the larger foldouts into one 'page'? If someone says GIMP, then I'm game! I have several manuals that will be copied and then probably recycled, so I'd like to know what folks are doing... ~Benjamin, KB9LFZ Since 1974, the award-winning Alpert JFCS has helped families of all faiths throughout most of Palm Beach County, FL, via counseling, seniors services, residences for the disabled, mentoring children, support groups and a lot more. * SOLUTIONS FOR LIVING (R)* *www.JFCSonline.com* http://www.jfcsonline.com/ * Please take note of our new website and E-Mail Addresses. * * Please update your contacts ASAP. * ___ NOTICE: This e-mail message and all attachments transmitted with it are intended solely for the use of the addressee and may contain legally privileged and confidential information. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately by replying to this message and please delete it from your computer. .
Re: [Repeater-Builder] manual and service manual scanning (digitize to PDF)
I was surprised how well the scan stitch worked, it even has fine skew controls. I'm more interested in an OCR program that will spit out regenerated text with the correct font and in the right places for a PDF.
Re: [Repeater-Builder] Bend an ICOM a little further
Yeah, I could see that. He did not specify the crystal manufacture, plus the factory compensated the element to what crystal was originally in it. I just got some Bomar crystals (Not my choice) for the clubs UHF Micor. The TX was off 14 to 39 kHz, Had to add a 10pF cap to get the trimmer in the center range. Strangely the RX was fine. On Thu, Feb 18, 2010 at 2:01 AM, Paul Plack pl...@xmission.com wrote: DC, he was given a free crystal which turned out to be worth what he paid. I never implied he was trying to rubber one cut for another channel, just rubber one that was too far off frequency. 73, Paul, AE4KR
Re: [Repeater-Builder] Bend an ICOM a little further
Seriously, some people need to read the original message before replying. The original complaint was running out of tunning range on the piston trimmer in the channel element while trying to net the crystal on frequency. Not rubbering the crystal to another channel or Nuclear warfare on an inactive club. Also I should mention that the receiver should be set by looking at the LO frequency on either a service monitor or a frequency counter of known precision, Tuning it until it sounds best is not the way to go. The LO frequency for the MASTR-II VHF will be either + or - 11.2 MHz from the receive frequency depending on the whether high side injection was specified when ordering the crystal. On Wed, Feb 17, 2010 at 3:52 PM, Paul Plack pl...@xmission.com wrote: Forgive me if I'm going where no one wants to go, but isn't there a point in the decline of a club at which the nuclear option becomes the best choice? Guys, the repeater's been a fun ride for 40 years, but we're down to three members, and no longer have enough in the treasury to keep the old girl running. The coordinator says there are people on the waiting list willing to spend the money to take care of a repeater. As I see it, we have two choices. I await your guidance. Sincerely... 73, Paul, AE4KR
Re: [Repeater-Builder] Bend an ICOM a little further
I think you are referring to not being able to net the rocks to the correct frequency in your channel element. This is usually due to not enough or too much capacitance in the oscillator circuit. Good crystal manufacturers will supply the mid range temperature compensation capacitor with their crystal, others do not. Anyway this capacitor sits in parallel with the piston trimmer capacitor. You will have to experiment with values to get the right one, but the capacitor should have a NP0 or equivalent temperature coefficient. To find the right value set the trimmer approximately mid range and change values of the compensation cap, while the ICOM is as close to 26.5 degrees Centigrade as possible. If you are low in frequency, decrease the capacitance, if too high, increase it. On Tue, Feb 16, 2010 at 11:54 PM, Nate Duehr n...@natetech.com wrote: On Feb 16, 2010, at 9:57 PM, KE4ZDG wrote: Hey folks, I'm working on a GE Mastr II high band repeater. Someone gave me some crystals that were made up for 146.010 RX. I installed one in an EC ICOM and the best I can adjust for is 146.0064, which sounds really scratchy when I inject a 3k deviation signal on 146.010. When I tune the monitor down to 146.0064, the RX audio cleans right up. I've backed out the screw until there's no more threads left in the ICOM. Is there a capacitor I can change or add to give me a little more tuning range to the ICOM? I just need the crystal to go up a hair more (400 Hz on the crystal freq). I know I'm promoting cheapness by not buying another crystal, but the club doesn't have much money to spend. Thanks, Jared
Re: [Repeater-Builder] anttena problem
Do you know what type of coax is going up to the antenna? Foil/Braid coax such as LMR-400 and 9913 are known desense generators.
