[Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
Only one of the five front-end coils for a Range 1 VHF Mitrek (HLD4081, 136-146 MHz) is still available from Motorola Parts. That one is part 2480032A07, the violet coil in L1, for $ 4.15. The only option may be to tack on some extra wire to the existing coils. Although modifying the tuning screws may work, I suspect the Q will suffer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer Sent: Friday, December 19, 2008 9:30 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom, Okay I guess I should ask if replacement coils for the Mitrek are still available from Motorola, and if so, at what cost? If they are no longer available, or are cost prohibitive, send me one of your Mitrek receivers and I'll see if I can come up with a new set of coils that properly tune the whole 2M band. I guess at this point we should go to private email. Kevin Hello Kevin Thanks for your reply. Your statement is correct in that all of the receiver coils begin to tune at the bottom of their travel. I have even tuned two or three too far and they dropped out with the resulting work to retrieve the screws. When tuned as best I can for sens the s/n ratio is 1+uv at 12db sinad. The original frequency sens was less than 1uv-usually about .3uv for 12db sinad. Replacing the coils are about the only solution I know of for these high split VHF units. I have in the past replaced two sets of receiver coils with Motorola coils and found I have good sensitivity as before modification. The transmitters all tuned well on this split and gave rated or more power output. The Mitrek coils looked very much like the Micor coils. I have replaced probably a half dozen Micor receiver coils proscured from Motorola in the past 20 or so years. Thanks. 73 de Tom Manning, AF4UG - Original Message - From: Kevin Custer mailto:kug...@kuggie.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Thursday, December 18, 2008 10:02 PM Subject: Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom, You say you find similar operation on 4 or 5 units. By that do you mean they won't make book specification on any frequency below 146 MHz? If that is the case, I would believe something is wrong. I have seen many Mitrek high-band receivers that were tuned for 144 something and had very good sensitivity. Let me ask you this When tuned at 144.89, is the front-end tuning all one ended, or is there adjustment to spare? In other words, can you tune the front-end without the fear of the tuning screws falling into the casting? If you have room left to go lower in frequency, then the front-end is not the problem, and you'll need to look elsewhere for the lack of sensitivity. Another question - do these 4 or 5 units tune and make book spec sensitivity on their original high-band channel? I guess what I'm saying is I doubt the problem is the front-end helical resonators, but if there is a need for a conversion I'm not opposed to looking into making a modification available, if it is needed. If there are others on the list that have had good luck with the Mitrek on frequencies below 146 MHz, please chime in and let us know what you have and how well it works. Kevin Hello Kevin You are correct on your freqs for xmit and rcv. The Mitrek units I have will only tune receive to 146.00Mhz. This leaves more than one meg to go to meet tolerance on 144.890. I have tried 4 or 5 units and find similar operation of all. This is the reason for my question about the Micor coils working for Mitrek. Thanks. 73 de Tom Manning, AF4UG - Original Message - From: Kevin Custer mailto:kug...@kuggie.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Tuesday, December 16, 2008 8:44 PM Subject: Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom, Do you mean 144.89 MHz? I would think your repeater would *transmit* on 145.490 MHz At any rate, no conversion is necessary for the Mitrek to make book specification sensitivity on 144.890 MHz.
Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
This probably will not work on the Mitrek since it may not use slugs to tune the coil, but I had a problem with a crystal on a Delta radio that would not go low enough in frequency. I removed the slug from the F2 coil and ran the slug for the F1 coil through max inductance and then added the second slug on top of the first. The combined slugs allowed me to net the crystal. 73 - Jim W5ZIT --- On Sat, 12/20/08, Eric Lemmon wb6...@verizon.net wrote: From: Eric Lemmon wb6...@verizon.net Subject: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...) To: Repeater-Builder@yahoogroups.com Date: Saturday, December 20, 2008, 9:27 AM Only one of the five front-end coils for a Range 1 VHF Mitrek (HLD4081, 136-146 MHz) is still available from Motorola Parts. That one is part 2480032A07, the violet coil in L1, for $ 4.15. The only option may be to tack on some extra wire to the existing coils. Although modifying the tuning screws may work, I suspect the Q will suffer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of Kevin Custer Sent: Friday, December 19, 2008 9:30 PM To: Repeater-Builder@ yahoogroups. com Subject: Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom, Okay I guess I should ask if replacement coils for the Mitrek are still available from Motorola, and if so, at what cost? If they are no longer available, or are cost prohibitive, send me one of your Mitrek receivers and I'll see if I can come up with a new set of coils that properly tune the whole 2M band. I guess at this point we should go to private email. Kevin Hello Kevin Thanks for your reply. Your statement is correct in that all of the receiver coils begin to tune at the bottom of their travel. I have even tuned two or three too far and they dropped out with the resulting work to retrieve the screws. When tuned as best I can for sens the s/n ratio is 1+uv at 12db sinad. The original frequency sens was less than 1uv-usually about .3uv for 12db sinad. Replacing the coils are about the only solution I know of for these high split VHF units. I have in the past replaced two sets of receiver coils with Motorola coils and found I have good sensitivity as before modification. The transmitters all tuned well on this split and gave rated or more power output. The Mitrek coils looked very much like the Micor coils. I have replaced probably a half dozen Micor receiver coils proscured from Motorola in the past 20 or so years. Thanks. 73 de Tom Manning, AF4UG - Original Message - From: Kevin Custer mailto:kug...@kuggie. com To: Repeater-Builder@ yahoogroups. com mailto:Repeater-Builder@ yahoogroups. com Sent: Thursday, December 18, 2008 10:02 PM Subject: Re: [Repeater-Builder] Holiday Special - MICOR 2 meter receiver conversion from W3KKC Tom, You say you find similar operation on 4 or 5 units. By that do you mean they won't make book specification on any frequency below 146 MHz? If that is the case, I would believe something is wrong. I have seen many Mitrek high-band receivers that were tuned for 144 something and had very good sensitivity. Let me ask you this When tuned at 144.89, is the front-end tuning all one ended, or is there adjustment to spare? In other words, can you tune the front-end without the fear of the tuning screws falling into the casting? If you have room left to go lower in frequency, then the front-end is not the problem, and you'll need to look elsewhere for the lack of sensitivity. Another question - do these 4 or 5 units tune and make book spec sensitivity on their original high-band channel? I guess what I'm saying is I doubt the problem is the front-end helical resonators, but if there is a need for a conversion I'm not opposed to looking into making a modification available, if it is needed. If there are others on the list that have had good luck with the Mitrek on frequencies below 146 MHz, please chime in and let us know what you have and how well it works. Kevin Hello Kevin You are correct on your freqs for xmit and rcv. The Mitrek units I have will only tune receive to 146.00Mhz. This leaves more than one meg to go to meet tolerance on 144.890. I have tried 4 or 5 units and find similar operation of all. This is the reason for my question about the Micor coils working for Mitrek. Thanks. 73 de Tom Manning, AF4UG
Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
I've had to add wire to the helicals on two Micors (UHF) to get them down to 447.75. It did the trick. It would certainly be worth a try. Chuck WB2EDV - Original Message - From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Saturday, December 20, 2008 10:27 AM Subject: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...) Only one of the five front-end coils for a Range 1 VHF Mitrek (HLD4081, 136-146 MHz) is still available from Motorola Parts. That one is part 2480032A07, the violet coil in L1, for $ 4.15. The only option may be to tack on some extra wire to the existing coils. Although modifying the tuning screws may work, I suspect the Q will suffer. 73, Eric Lemmon WB6FLY
[Repeater-Builder] Re: Want: GLB Receiver Pre-selector (please)
Re: Want: GLB Receiver Pre-selector (please) Yes, the box and board Joe sent the picture in is one of the GLB Preamplifier beasts I'm looking for. I've seen this same and similar circuit appear in a number of receivers, pre-amplifiers, pre-selector circuits going way back to early EF-Johnson receivers. I would even guess they (EFJ Comp.) probably were not the inventors or first users of this almost exact front-end circuit layout. Spectrum (RIP) and a few other companies did offer the GLB and and similar variant units in some of their products. Thank you to those who have already replied... no pre-amplifiers in hand yet, but I'm still looking and answering a few emails to fish a GLB out of the wood-work. Doesn't matter what band they are on, or condition (even in pieces). thanks much... cheers, skipp skipp025 at yahoo.com Joe k1ike_m...@... wrote: It's definitely a GLB preselector, model P-147.49Mhz, Serial #7110. That's what it says on the case. This type of preselector was seen in several pieces of equipment. One that comes to mind was an option on the SCR-77 Spectrum Repeater. I have one in service right now, and I suspect Spectrum might have gotten them from GLB. The attached photo shows it sitting on top of the repeater. Scott Zimmerman wrote: Next, the brass tube helical resonators in your assembly look to me to be as made by ACS / Kendecom and as used in their repeater receivers. Yep they LOOK like them, but the're not. This is a typical looking GLB preselector preamp. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Rd Boswell, PA 15531
[Repeater-Builder] Re: VXR 7000 with desense
Thanks to all who have responded. A quick up date. Putting the dummy load on the TX port of the repeater (replace the duplexer with a dummy load) has shown that the repeater works without cycling - so my initial thought of something going on inside the repeater is out the window... (Thanks Doug) If is was spurious TX trash while the transmitter was coming up, then after we overcame the desense with the service monitor and the TX stabilized, then when we turned the service monitor back down, the TX should have stayed on, but it didn't and started to cycle again Still racking the grey cells, Rick, N5RB --- In Repeater-Builder@yahoogroups.com, pontotochs pontoto...@... wrote: Hi, I've checked the previous posts on this issue, but I am hoping that there is more light to be shed. We have a VXR 7000 that has had issues for a while as a two meter repeater. In the shop we set it up with its DB 4026 duplexer and 50 ohm dummy load and monitored the output power with a Bird thru line watt meter. We used a service monitor to inject the RX signal to get 10 dB quieting (approx 0.2 micro volt). Put the unit into repeat mode and the repeater will cycle (go in and out of transmit) until the RX signal is increased about 20 to 25 dB (approx 3.6 micro volt). Looking at what is coming in the receive port with the transmitter is keyed is about -75 dBw (50 watt out with about 95 dB of isolation) at the TX frequency, and there is little to no hash at the RX frequency - seeing the noise floor of the spectrum analyzer (-120 dB). Put the 7000 into base station mode, hooked up second signal source, set first signal source to give 10 dB quieting at the RX frequency (0.2 uV), set the second signal source to emulate what we saw from the duplexer (79 mV at TX frequency) and there was no desense. Increased the simulated TX voltage to better than 1 volt and still no desense. My thought is that something has gone bad internally within the 7000. Is there something else I need to try? Thanks in advance for your help. Regards, Rick, N5RB
[Repeater-Builder] Re: VXR 7000 with desense
Hi Doug, Thanks, I thought about the dummy load on the TX output directly on the way home last night. So I am going to try it as soon as I can get to it. I didn't think about checking the TX spectrum while the thing was cycling - thanks. Regards, Rick --- In Repeater-Builder@yahoogroups.com, Doug Bade k...@... wrote: Rick; I think you need to isolate whether it is tx through the duplexer or something else bothering the rx and or squelch. It sounds like the tx signal fundamentally is clean from your analysis so far.. in order to isolate through the duplexer, connect the tx directly to a dummy load instead of it's side of the duplexer while injecting rx into the duplexer. if it does not cycle, the tx is sending something through the duplexer to the rxif it does cycle.. it is an internal issue as you suspect.. I would use the tx to duplexer cable in the dummy load path as you want to see if some radiation from it is part of the equation. I lean more to spurious on initial keyup... causing a noise burst maybe due to exciter tuning... but this test should tell you if it is conducted internally or passed through the duplexer. Doug KD8B
Re: [Repeater-Builder] VXR 7000 with desense
Hi Rick -- I am new to the group so I have not seen all of the posts with regards to your problem on the 7000. However, one thing that you may want to check is whether the PL is feeding back into the RX from the TX, if the tones are the same. I have seen this several times in the past on different machines and it is always annoying. Don't assume that just because you can run PL in and out that it will be able to run the same tone. GL -- Rick NU7Z On Thu, Dec 18, 2008 at 9:44 AM, Doug Bade k...@thebades.net wrote: Rick; I think you need to isolate whether it is tx through the duplexer or something else bothering the rx and or squelch. It sounds like the tx signal fundamentally is clean from your analysis so far.. in order to isolate through the duplexer, connect the tx directly to a dummy load instead of it's side of the duplexer while injecting rx into the duplexer. if it does not cycle, the tx is sending something through the duplexer to the rxif it does cycle.. it is an internal issue as you suspect.. I would use the tx to duplexer cable in the dummy load path as you want to see if some radiation from it is part of the equation. I lean more to spurious on initial keyup... causing a noise burst maybe due to exciter tuning... but this test should tell you if it is conducted internally or passed through the duplexer. Doug KD8B At 05:04 PM 12/17/2008, you wrote: Hi, I've checked the previous posts on this issue, but I am hoping that there is more light to be shed. We have a VXR 7000 that has had issues for a while as a two meter repeater. In the shop we set it up with its DB 4026 duplexer and 50 ohm dummy load and monitored the output power with a Bird thru line watt meter. We used a service monitor to inject the RX signal to get 10 dB quieting (approx 0.2 micro volt). Put the unit into repeat mode and the repeater will cycle (go in and out of transmit) until the RX signal is increased about 20 to 25 dB (approx 3.6 micro volt). Looking at what is coming in the receive port with the transmitter is keyed is about -75 dBw (50 watt out with about 95 dB of isolation) at the TX frequency, and there is little to no hash at the RX frequency - seeing the noise floor of the spectrum analyzer (-120 dB). Put the 7000 into base station mode, hooked up second signal source, set first signal source to give 10 dB quieting at the RX frequency (0.2 uV), set the second signal source to emulate what we saw from the duplexer (79 mV at TX frequency) and there was no desense. Increased the simulated TX voltage to better than 1 volt and still no desense. My thought is that something has gone bad internally within the 7000. Is there something else I need to try? Thanks in advance for your help. Regards, Rick, N5RB
RE: [Repeater-Builder] RE: What Have I got and can I get information about it.
I have 3 of them, One has HT-90 crystal controlled units inside. The other 2 are GP-300 and can be programmed. It is a bit of a hassle, as I do not have whatever is the proper interface, so I took the units out and popped them into gp300 cases and programmed them, then put them back into the Systel. Works! If yours has very rectangled shaped units that are just boxes, then it is most likely HT-90 and crystal controlled. Maybe you can find crystals, not sure. But if the 2 units look like a HT out of the case with speaker hole, kind of rounded corners, then it is probably the GP300 unit and much better. Mine work great with GMRS. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Rick Beatty Sent: Thursday, December 18, 2008 12:37 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
Re: [Repeater-Builder] RC96 manual
John -- et al -- I opened the zip without issue and everything is there as far as I can tell -- send me an email and I will send the 160 pages to you -- LOL! Rick On Thu, Dec 18, 2008 at 2:43 PM, Joe k1ike_m...@snet.net wrote: Kevin sent this link and it works. http://www.repeater-builder.com/acc/acc-rc-96-manual.zip 73, Joe, K1ike John Transue wrote: Joe, I get the same message when trying to download the file. I have a hard copy but no electronic copy. Let me know if you want me to copy it for you. John Transue
[Repeater-Builder] Re: VXR 7000 with desense
Hi Eric, Thanks, I haven't taken the cover off yet, but I will. And yes the typo demon got me on the duplexer it is a DB 4062, 6 cavity duplexer. Regards, Rick --- In Repeater-Builder@yahoogroups.com, Eric Lemmon wb6...@... wrote: Rick, You might check to see if the internal jumpers inside the VXR-7000 cabinet are single-shielded. I had a VXR-5000 UHF repeater that had single-shield jumpers with gray jackets and no markings, and had a small amount of desense. Once I replaced all three jumpers with RG-400/U double-shielded cable, there was no trace of desense. Perhaps Vertex tried the same money-saving trick on the later model. Check to make sure that all shields and cover plates are installed, with no screws missing. I wonder if your duplexer has been mis-identified. A DB4026 is a UHF bandpass cavity filter, not a duplexer. You probably meant DB4062, which is a six-cavity VHF BpBr duplexer. 73, Eric Lemmon WB6FLY
[Repeater-Builder] NHRC-Squelch Board
Anybody have any NHRC-squelch boards in service? I am looking at getting either one of those or a RLC-MOT board from link Communications. Is one better then the other? Do they do the same thing? Anybody try to clone an NHRC board? (they look easy) I am wanting to install something on a Mitrek for that nice Micor type squelch. Actually, I just want to get rid of that Chkccc! Thanks, Jordan
[Repeater-Builder] Re: VXR 7000 with desense
HI Jim, Thanks for the response, I was using the port on the 4304 to inject the signal from the service monitor. The cables in the duplexer are 1/4 super flex. Nope your are not preaching to the choir. This is my first time trying to trouble shoot a repeater system. So I know that there are some subtleties that come with experience. Besides sometimes its the obvious things that trip us up. Regards, Rick --- In Repeater-Builder@yahoogroups.com, Jim Brown w5...@... wrote: I don't know what type of service monitor you are using, but I tend to use an iso-tee to measure desense with the duplexer hooked to a dummy load through the iso-tee. It might be possible for the service monitor to contribute to some signal reflection if it is used as the power termination. Make sure the cables to the duplexer are double shielded, like RG-214, and inspect the connectors to make sure all the grounds are in good shape. Check the internal cables in the VXR-7000 for the same potential problems. I may be preaching to the choir and if so I apologize. 73 - Jim W5ZIT
RE: [Repeater-Builder] RE: What Have I got and can I get information about it.
Huh? Since when is a GP300 not type accepted for GMRS? News to me, but I have been wrong before. (once!) -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Milt Sent: Thursday, December 18, 2008 2:12 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] RE: What Have I got and can I get information about it. Rick, The Systel was a 2 watt repeater with a telephone interconnect designed for small on-site systems. I doubt that it would be type accepted for GMRS as it was based on one or more series of portables (HT-90 and/or GP300). Of course the phone patch would not be usable on GMRS either. MIlt N3LTQ - Original Message - From: Rick Beatty mailto:nu7...@gmail.com To: Repeater-Builder@ mailto:Repeater-Builder@yahoogroups.com yahoogroups.com Sent: Thursday, December 18, 2008 12:37 AM Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
Re: [Repeater-Builder] DATARADIO 96+ Manual needed
Kenny, I sent you a copy of the manual -- unzipped -- Rick NU7Z On Thu, Dec 18, 2008 at 2:56 PM, KG5KS - Kenny Thompson kg...@yahoo.comwrote: Guess the ham that said he would send the manual has forgotten about it..hi I need a manual with pinout or specs for the Dataradio 96+ unit. I'm wanting to see if they could be used in a ham radio application. I have not found out anything online that would show me what pinouts and specs. I appreciate it! Thank you 73 Kenny ARS KG5KS Currently DEC B, EC Jackson County, OBS, ORS, ARRL VE Courses completed Nims 700, ICS 100, 200, 300, 400, 702, 317, 394, 240, 242, 139, 245, 275, 230, 235, 800, ARECC 1, Skywarn Certified Continuously, Past Public Safety Officer for State.
[Repeater-Builder] Re: MSF 5000 vhf power amp TLD2692A manual query
Dear Bob, I've got the MSR-2000 manuals for the repeater gear that I have to maintain. I'd love to have the relevant manual sections for this power amp. It's OK that the unit has sealed modules in it. I'm looking for the specs, tuning info, schematic and all, so that I can maintain this unit when we deploy it in one of our club's 2m repeaters. I'll gladly pay the price and accept the delay for getting the manual copied at the copy center! Thanks so much for offering that possibility! I bet that they could render it both as PDF and paper at the same time... 73, George Byrkit, K9TRV ARROW Technical coordinator (www.w8pgw.org) --- In Repeater-Builder@yahoogroups.com, Bob M. msf5kg...@... wrote: I've got a manual that has that PA in it. Not much there except a power splitter, two FET PA modules (undocumented), a power combiner, and a power sensor. There's some troubleshooting charts and some parts lists, but absolutely nothing on the actual PA modules themselves. Most of the sheets are big fold-outs. Those with circuit board layouts are in color. It would take considerable time to scan them, plus it would be a very big file. Easier to make copies at the local copy center, but that wouldn't happen for several days and would cost several dollars plus postage. I can give you specific info from the manual a lot faster. Bob M. == --- On Sun, 12/14/08, ghbyrkit ghbyr...@... wrote: From: ghbyrkit ghbyr...@... Subject: [Repeater-Builder] MSF 5000 vhf power amp TLD2692A manual query To: Repeater-Builder@yahoogroups.com Date: Sunday, December 14, 2008, 11:54 AM Hi, I've got an MSF 5000 VHF power amp, TLD2692A. Does anyone have a manual for this beast, or can you point me to a link for one? My meager attempts at google-fu didn't show anything that I could identify as such, nor any on eBay, nor R-B website. Thanks so much for reading, especially if you can help! 73, George K9TRV (Technical Coordinator for ARROW, W8PGW.org)
[Repeater-Builder] Neat'o Swell - Projects and PC Board Web Page.
Some neat projects and ideas available on this web page. http://www.w1ghz.org/small_proj/small_proj.htm enjoy, s.
[Repeater-Builder] fan timer circuit
I was directed by someone on the reflector here some months back, to a cooling fan timer circuit that is posted on the repeater builders website. I wonder if anyone has tried to build this ? - Thanks.. - Mike
Re: [Repeater-Builder] fan timer circuit
I would think that the person who designed it, and submitted it for posting on r-b, built and tested it. Did you have a problem with it? Do you think there's an error in the diagram? If so, it should be fixed. Please provide more info. Bob M. == --- On Sat, 12/20/08, Michael Ryan mryan...@tampabay.rr.com wrote: From: Michael Ryan mryan...@tampabay.rr.com Subject: [Repeater-Builder] fan timer circuit To: Repeater-Builder@yahoogroups.com Date: Saturday, December 20, 2008, 1:57 PM I was directed by someone on the reflector here some months back, to a cooling fan timer circuit that is posted on the repeater builders website. I wonder if anyone has tried to build this? - Thanks - Mike
[Repeater-Builder] Doug Hall 4RV Voter
I have available a DHE 4RV 4 receiver voter system. Please note that this is an older generation than the 4RV/2 which is currently being produced. This system consists of a 4RV voter, a VCM, and power supply in a 19 inch rack mount. It was removed from a site that was decommissioned and was not hooked up, so I do not know the operational status. If interested, please e-mail me direct, off list. I would prefer a trade, but all offers considered. Thanks and 73, Kevin, K9HX
RE: [Repeater-Builder] RE: What Have I got and can I get information about it.
You're not wrong this time. A UHF GP300 radio with the FCC ID of either ABZ99FT4010 or ABZ99FT4011 is approved for Part 95- but only for 16K0F3E emissions. GMRS yes, FRS no. Moving on to the SYSTEL question, I just discovered that the manual is still available from Motorola Parts. It is manual 6882446W01, for about $17. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Craig W Clark Sent: Thursday, December 18, 2008 11:36 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] RE: What Have I got and can I get information about it. Huh? Since when is a GP300 not type accepted for GMRS? News to me, but I have been wrong before. (once!) -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Milt Sent: Thursday, December 18, 2008 2:12 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] RE: What Have I got and can I get information about it. Rick, The Systel was a 2 watt repeater with a telephone interconnect designed for small on-site systems. I doubt that it would be type accepted for GMRS as it was based on one or more series of portables (HT-90 and/or GP300). Of course the phone patch would not be usable on GMRS either. MIlt N3LTQ - Original Message - From: Rick Beatty mailto:nu7...@gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Thursday, December 18, 2008 12:37 AM Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
Re: [Repeater-Builder] Doug Hall 4RV Voter
Yes Kevin, I am interested, contact me off list to discuss. Mike KB5FLX m.dietr...@peoplepc.com --- - Original Message - From: Kevin Berlen, K9HX To: Repeater-Builder@yahoogroups.com Cc: repeat...@yahoogroups.com Sent: Saturday, December 20, 2008 1:47 PM Subject: [Repeater-Builder] Doug Hall 4RV Voter I have available a DHE 4RV 4 receiver voter system. Please note that this is an older generation than the 4RV/2 which is currently being produced. This system consists of a 4RV voter, a VCM, and power supply in a 19 inch rack mount. It was removed from a site that was decommissioned and was not hooked up, so I do not know the operational status. If interested, please e-mail me direct, off list. I would prefer a trade, but all offers considered. Thanks and 73, Kevin, K9HX
[Repeater-Builder] UHF Micor Station
I'm reassembling a UHF Micor station. I have a Audio/squelch #TRN6006A. Is this the correct board? There is no audio amp in the chassis either. Does it use one from a VHF or UHF Mobile?? Thx WX3M
Re: [Repeater-Builder] UHF Micor Station
Terry wrote: I'm reassembling a UHF Micor station. I have a Audio/squelch #TRN6006A. Is this the correct board? Yes - usually. There is no audio amp in the chassis either. Does it use one from a VHF or UHF Mobile?? Most of the audio amp is on the AS Board, but the pass transistor (power amplifier) assembly is on a hunk of aluminum, and yes this assembly (TLN4290B) can be stolen from a mobile and used in the station. The hunk of aluminum is anodized (coated). The anodizing doesn't conduct electricity. This allows the transistors to be assembled to the heatsink without an insulating washer. While you don't need to remove the transistors for remounting the assembly into the station, you should be careful with it as not to scratch this coating off when handling it. Kevin Custer
Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
Eric Lemmon wrote: Only one of the five front-end coils for a Range 1 VHF Mitrek (HLD4081, 136-146 MHz) is still available from Motorola Parts. That one is part 2480032A07, the violet coil in L1, for $ 4.15. The only option may be to tack on some extra wire to the existing coils. Although modifying the tuning screws may work, I suspect the Q will suffer. Eric, I would think a coil retro like what I make available for the MICOR will also work in the Mitrek. This approach would be way better than tacking some added wire onto the existing coil or modifying the screws in which I know that is a bad idea. Is there something special about the Mitrek front-end that you believe would prohibit such a conversion? It's been a while since I messed with the Mitrek but I don't remember anything that would prohibit the correct length coil to be installed... Kevin
Re: [Repeater-Builder] VXR 7000 with desense
At 12/18/2008 10:02, you wrote: Hi Rick -- I am new to the group so I have not seen all of the posts with regards to your problem on the 7000. However, one thing that you may want to check is whether the PL is feeding back into the RX from the TX, if the tones are the same. I have seen this several times in the past on different machines and it is always annoying. Don't assume that just because you can run PL in and out that it will be able to run the same tone. Why not? If something is mixing the output back to the input, normally you'd want to find eliminate it since it's necessarily causing desense. Running different or split tones, can serve to cover up the problem if it's external to your equipment and out of your control. However, most ham transceivers are not capable of split tone operation. Bob NO6B
RE: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
Kevin, Other than being physically smaller, I don't know of any helical resonator design issues that preclude your Micor mod from being adapted to the Mitrek. I am modifying some low-band Mitreks for 6m duty, but all that takes is a handful of capacitors. I have yet to address converting a high-band Mitrek to 2m, so I have no idea what issues may arise. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer Sent: Saturday, December 20, 2008 5:41 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...) Eric Lemmon wrote: Only one of the five front-end coils for a Range 1 VHF Mitrek (HLD4081, 136-146 MHz) is still available from Motorola Parts. That one is part 2480032A07, the violet coil in L1, for $ 4.15. The only option may be to tack on some extra wire to the existing coils. Although modifying the tuning screws may work, I suspect the Q will suffer. Eric, I would think a coil retro like what I make available for the MICOR will also work in the Mitrek. This approach would be way better than tacking some added wire onto the existing coil or modifying the screws in which I know that is a bad idea. Is there something special about the Mitrek front-end that you believe would prohibit such a conversion? It's been a while since I messed with the Mitrek but I don't remember anything that would prohibit the correct length coil to be installed... Kevin
Re: [Repeater-Builder] RE: What Have I got and can I get information about it.
The question is frequency stability for fixed stations. If the unit is operated as built (minus the phone patch) vs the possible use of an external amplifier as mentioned in the original post. Just because the portable on which the unit is based is type accepted for portable use, the use of the same radio in a fixed station configuration could possibly fall under a different set of standards. Be sure to consult the appropriate sections of the current version of Part 95. MIlt N3LTQ - Original Message - From: Craig W Clark To: Repeater-Builder@yahoogroups.com Sent: Thursday, December 18, 2008 2:35 PM Subject: RE: [Repeater-Builder] RE: What Have I got and can I get information about it. Huh? Since when is a GP300 not type accepted for GMRS? News to me, but I have been wrong before. (once!) -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Milt Sent: Thursday, December 18, 2008 2:12 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] RE: What Have I got and can I get information about it. Rick, The Systel was a 2 watt repeater with a telephone interconnect designed for small on-site systems. I doubt that it would be type accepted for GMRS as it was based on one or more series of portables (HT-90 and/or GP300). Of course the phone patch would not be usable on GMRS either. MIlt N3LTQ - Original Message - From: Rick Beatty To: Repeater-Builder@yahoogroups.com Sent: Thursday, December 18, 2008 12:37 AM Subject: [Repeater-Builder] RE: What Have I got and can I get information about it. I recently was given a SYSTEL unit made by Motorola, on 464.../469... with duplexer and looks to be a repeater, with low level output (2w or so). Would be great for remote work on GMRS, does anyone on the group have data/information on this little cutie? Also I am looking for a schematic for an amplifier used with the portable. a UHF with the number N1275a? thanks in advance -- Rick
Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
Hi Eric, Kevin, Other than being physically smaller, I don't know of any helical resonator design issues that preclude your Micor mod from being adapted to the Mitrek. Oh okay good - - I was unsure if there was something I was missing; which could easily be the case. Thanks, Kevin
Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...)
Hi, Is there a point inside the Mitrek that one can take the audio out to the controller (in this case a Link-Comm RLC-2A)? A low band Mitrek (33Mhz) I have downloaded the information fromLou's Mitrek Repeater Conversion and a couple of others which mention a schematic for emphasis before going into the controller. Taking the audio out on pin 11. I would like to leave this out if possible and feed directly? Regards and Merry Christmas Kev. - Original Message - From: Kevin Custer To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 21, 2008 2:40 PM Subject: Re: [Repeater-Builder] Converting a Range 2 VHF Mitrek to Range 1 (WAS: Holiday Special...) Eric Lemmon wrote: Only one of the five front-end coils for a Range 1 VHF Mitrek (HLD4081, 136-146 MHz) is still available from Motorola Parts. That one is part 2480032A07, the violet coil in L1, for $ 4.15. The only option may be to tack on some extra wire to the existing coils. Although modifying the tuning screws may work, I suspect the Q will suffer. Eric, I would think a coil retro like what I make available for the MICOR will also work in the Mitrek. This approach would be way better than tacking some added wire onto the existing coil or modifying the screws in which I know that is a bad idea. Is there something special about the Mitrek front-end that you believe would prohibit such a conversion? It's been a while since I messed with the Mitrek but I don't remember anything that would prohibit the correct length coil to be installed... Kevin
