RE: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders.
Kevin, Now that I understand what you are trying to do, be advised that just because you have the link RXs co-located with the comparator your remote site Link transmitters do not have to transmit all the time. Just an FYI. I started to do exactly what you are attempting with the comparator but it just was not worth my time to modify it make it work when I had the other recievers available to me at the right price. I have all the manuals and my prints of the mods (including the SRN-1068) which make this comparator actually vote the best reciever properly, if you need them. Also have the factory mod sheets for the receivers as well if you decide to go that way. Dan -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Kevin Custer Sent: Thursday, January 19, 2006 10:58 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders. Hi Dan, Thanks for the response, but I'm looking for someone that has modified the comparator for use outside the Motorola Spectra TAC environment that has done away withe the need of continuous links and a status tone (modified it for COS input) manually adjusted the AGC, but still utilize most of the functionality of it. My linkback equipment is flat from 45 cycles to 5.5 kHz and I have receivers at the repeater site that have a widened I-F to capture all of the noise bandwidth I can get. The remote receivers are Hamtronics R144's that have been modified for better squelch action. They feed Hamtronics TA-451 exciters that have been retro fitted with a direct FM modulator. Audio recovered from the receivers discriminator is buffered, limited, and filtered at 5.5 kHz and fed directly to the FM modulator. The deviation is set to a 5 to 4 ratio to preserve the headroom. The linkback receivers are Hamtronics R451's that have had some of the crystal filters removed and a slightly wider 455 I-F filter replacing the original quite narrow one. Kevin Dan Babilla wrote: HI Kevin, I use Spectra TAC Revievers (such as the C04RTB3108) as Link RXs stack at the same site as the Comparator and I directly wire them in within the same cabinet. In working on systems with these type of voting systems for many customers in the 80's -early 90's, I have found that the levels between receivers are very critical as are the levels between the audio and the status tone. Everything needs to be exactly the same for the Spectra Tac comparator to properly vote the best reciever signal. For best results use all the same remote recievers as well. Make sure the audio response of all reciever paths are adjusted the same, I use an OP amp circuits to tailor all audio down links to be completely flat across the link. I'm sure you already do that though. 73's, Dan KA0OXH -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Kevin Custer Sent: Wednesday, January 18, 2006 9:06 PM To: Repeater Builder; Micor List Subject: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders. Hi, Need some opinions from folks that may be using the (newer) Motorola Spectra TAC Comparator as a stand alone voter, using RF links that don't transmit all the time. I have some theories on what to do, but I thought I would post to see what others have done. Please be as specific as you can. The comparator I have is the newer style that uses Signal Quality Modules that produce a voltage that corresponds with the quality of the signal received, not the 3 Micor squelch chips. Thanks in advance, Kevin Custer W3KKC Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Squeeling Problem Resolved!! (I hope)
Also, I have found a PA deck that is poorly tuned will oscillate too. Neil - WA6KLA Bob Dengler wrote: At 1/19/2006 08:17 AM, you wrote: Ok guys I think I resolved the squeeling problem. I Got to the site this morning while guys were using the rptr and the problem was existing. When tuning the PA awhile back I noticed if you went to far one way it would oscillate (feedback, whatever) or go spurrious. Where I thought was the proper setting was just on the edge of this. I retuned the PA and all cleared up. Even cleaned up Rec'd audio just a bit. This has been happening more in the early mornings. May be the frost, dampness on the antenna created a slight impedence mismatch. Using a If slight antenna impedance changes are causing your PA to oscillate, your PA needs servicing or replacement. At the very least you need an isolator on the PA output so it sees 50 ohms across the band. Bob NO6B Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Operating a Spectra-TAC Comparator (Voter) without RX encoders.
skipp025 wrote: I've done it... you really need to make and install the status tone generators. What didn't you like about running it without the tone generators? For a while adapter circuits made for the task were available from a number of sources like RCA and Cetec Vega. Back in days of old I came into a small supply of the Cetec Vega units and we simply cloned them. (plus they had a killer audio compressor circuit. If you really wanted to see the circuit, I might have a copy in my files... but you might have to buy me a cup of coffee at Dayton. :-) (light cream, no sugar). I'd probably send you the information even if you didn't buy me a cup of coffee. Sure, I'll even buy you an ole hot dog or bratwurst. Also know that Motorhead came out with a modificiation to the Spectra Tac Current Generator Module, which improves the vote performance quite a bit. I also have that paper- work if you burn to have it. Yes, please.. It may be the same mod that Dan talked about (SRN-1068), but it would be interesting to see if they are the same mod. Thanks Skipp, Kevin Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders.
Hi Dan, thanks for the reply, Kevin, Now that I understand what you are trying to do, be advised that just because you have the link RXs co-located with the comparator your remote site Link transmitters do not have to transmit all the time. What keeps the Comparator from failing, then? Just an FYI. I started to do exactly what you are attempting with the comparator but it just was not worth my time to modify it make it work when I had the other recievers available to me at the right price. My intent isn't to preserve Motorola's functionality, but rather to compare this voter to my own design. I have all the manuals and my prints of the mods (including the SRN-1068) which make this comparator actually vote the best reciever properly, if you need them. I have the proper manual, but I don't have the SRN-1068 mod. I would like to have that if you can scan it and send it to me either as a Word, PDF, or JPG, or a photocopy by mail. I'm good in all of the modern online callbooks, www.qrz.com , etc. Also have the factory mod sheets for the receivers as well if you decide to go that way. I'm really not interested in installing the Motorola Spectra-TAC receivers and encoders, since I already have these others installed. Thanks, Kevin Custer W3KKC Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders.
Thanks for your thoughts, Tony. It would appear that from your explanation, you used PL for signaling to the SQM, since the link transmitters continued to transmit for a length of time after the remote receiver lost signal. Or, did you still use the status tone and simply not use constant link transmit? Kevin tony dinkel wrote: Kevin, I did that a bunch of years ago both commercially and amateurly. Equipment involved was native motorola, ge and ef johnson. Did it on 420, 960, 1296 and the 2.5watt, 12.5kHz 450 channels. I built an add on COR board to the link receivers and forced an SQM disable to the comparator. It seems to me that is available on screw terminals behind each sqm, if I can find my manual I will check. I made the carrier hang time between 15 seconds and a minute on the link tx's, also even on PL systems I made the link tx carriers come up with carrier only. The overall systems were still mostly PL though. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Antenna gurus?
On Wed, 18 Jan 2006, Joe Montierth wrote: I think you would be better off just getting a panel antenna with 12 dBi of gain and the approx 70 degree horizontal beamwidth. Well, that's certainly a nice thought except for a few things: I already have several of the 902MHz 6dBi patch antennas lying around, and a 12dBi patch on 902MHz is going to be much larger than a corresponding patch with the same antenna gain on 2.4GHz. Finally, there's the overall tower loading to consider -- a two-foot by two-foot antenna is four square feet of windload. Spreading that out over four seperate places distributes the stresses on the tower. But mostly I'm just wanting to use what I already have since I have a box of nine I'm doing nothing with at the moment. :) -- Kris Kirby, KE4AHR [EMAIL PROTECTED] BIG BROTHER IS WATCHING YOU! This message brought to you by the US Department of Homeland Security Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Antenna gurus?
On Thu, 19 Jan 2006, Laryn Lohman wrote: I think the spacing should be closer to .85-1.0 wavelength. As an example, the DB224 and others similar in configuration, no matter what the band, will use this spacing. I'm inclined to agree; the total wave front from the antennas should be in sync from the surface. That's the neat part about dealing with 1/4 and full-wave sections -- 1/4 and 5/4 are mostly interchangable and sometimes 3/4 as well. -- Kris Kirby, KE4AHR [EMAIL PROTECTED] BIG BROTHER IS WATCHING YOU! This message brought to you by the US Department of Homeland Security Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Antenna gurus? Antenna Info sheet available
On Fri, 20 Jan 2006, skipp025 wrote: As a web reader to the group, I don't receive your entire email address. So you'd have to contact me direct. But I think I found your address on the web and have already sent you a copy. If you don't receive it, please email me direct. Consider posting an email address to the group like my example below so yahoo doesn't chop off the domain name. Shoot, email it to me and I'll send it to Dick. :) kris at catonic dot net -- Kris Kirby, KE4AHR [EMAIL PROTECTED] BIG BROTHER IS WATCHING YOU! This message brought to you by the US Department of Homeland Security Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] 800 MHz MASTR II Station question
Hi All, I am consiering buying a MASTR II Repeater Station, RX 806.7375 and TX 851.7375. My question is, will it tune up to the 902 /927 MHz area, as I'm beginning to do some linking up inthat reqion. Thanks, Shorty, K6JSI San Diego Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX ...
Well, I done it on our repeaters. We run SpectraTac. Originally I ran link transmitters constantly keyed. Some are still that way. I have also converted SQM's to use cor from a link receiver. Required replacing the agc cap c9 with a fixed resistor to maintain a constant agc level. Disabling the line fail detector, etc. I even run converted and regular sqm's in the same comparator. I will try to find my manual with the mods if this is of interest. Thanks, Glenn W8AK YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] Re: Operating a Spectra-TAC Comparator (Voter) without RX encoders.
skipp025 wrote: I've done it... you really need to make and install the status tone generators. What didn't you like about running it without the tone generators? It was just a lot easier to use the tone generators adapters. Plus we were using a comibination of original method operation and local-distant located receivers with the adapters. (it was a mixed system). The adapters were pretty easy to build once you had the information. If you really wanted to see the circuit, I might have a copy in my files... but you might have to buy me a cup of coffee at Dayton. :-) (light cream, no sugar). I'd Sure, I'll even buy you an ole hot dog or bratwurst. No charge really... I'm pretty sure I know where the Cetec Vega Circuit is, so I'll put it on my list of things to scan and forward along. Also know that Motorhead came out with a modificiation to the Spectra Tac Current Generator Module, which improves the vote performance quite a bit. I also have that paper- work if you burn to have it. Yes, please.. It may be the same mod that Dan talked about (SRN-1068), but it would be interesting to see if they are the same mod. Thanks Skipp, Kevin I know where that paperwork is, so I'll put it in the stack of things to do. The update was related to running lots of SQM (sig quality modules) units and the current generator becomming unstable. The fix was the addition of a small daughterboard, with an updated current generator. If you're only running a few modules in one shelf, you probably won't notice the problem. If you're running more than one voter shelf, you should think about the mod if the programmed type of operation has hunting problems. I'll work on getting that info to you... real world is early next week as things work out. skipp Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Operating a Spectra-TAC Comparator (Voter) without RX encoders.
Kevin Custer [EMAIL PROTECTED] wrote: Hi Dan, thanks for the reply, Kevin, Now that I understand what you are trying to do, be advised that just because you have the link RXs co-located with the comparator your remote site Link transmitters do not have to transmit all the time. What keeps the Comparator from failing, then? What I call the local adapter method is just a local cos/cor operated status tone generator. The adapters were made to use non motorhead receivers into the voting system, but you can easily locate the adapter at the voter end and just trigger it with the link rx cor/cos. Call the status tone a non signal present idle tone that is removed with an active signal. It's used to detect the link status/quality and set the SQM AGC action for best S-N Voting. My intent isn't to preserve Motorola's functionality, but rather to compare this voter to my own design. The Motorola SQM circuit is really well done. Typical Commercial Overkill, but that's what you want in public radio service. I'm really not interested in installing the Motorola Spectra-TAC receivers and encoders, since I already have these others installed. Thanks, Kevin Custer W3KKC If you go Motorola, you'll never go back... oh wait, I've heard that's something else. Sorry about that... :-) cheers, skipp Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] WTB 162.2 reed for Micor
I am in need of a 162.2Hz (5B) reed like the KLN6209A for a Micor station I am converting. Will eithr buy outright or swap. Thanks Henry K4HAL (at) CHARTER (dot) NET Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Duplexer retune / recoax
Have you tested it into a dummy load? If you were able to achieve a decent amount of isolation on a service monitor, then I wouldn't think you would need to go through the trouble of re-cabling itJust a thought..Andy Yahoo! Photos Ring in the New Year with Photo Calendars. Add photos, events, holidays, whatever. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] Digest Number 3562
Kevin, when I wrote that I did not understand your full intent. I always used the 2175 status tone, regardless of whether I had PL on the sat receivers, links or both. td Date: Fri, 20 Jan 2006 08:27:29 -0500 From: Kevin Custer [EMAIL PROTECTED] Subject: Re: Operating a Spectra-TAC Comparator (Voter) without RX encoders. Thanks for your thoughts, Tony. It would appear that from your explanation, you used PL for signaling to the SQM, since the link transmitters continued to transmit for a length of time after the remote receiver lost signal. Or, did you still use the status tone and simply not use constant link transmit? Kevin tony dinkel wrote: Kevin, I did that a bunch of years ago both commercially and amateurly. Equipment involved was native motorola, ge and ef johnson. Did it on 420, 960, 1296 and the 2.5watt, 12.5kHz 450 channels. I built an add on COR Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders.
Kevin Custer wrote: I'm really not interested in installing the Motorola Spectra-TAC receivers and encoders, since I already have these others installed. Thanks, Kevin Custer W3KKC Isn't there an EM input to the voter? That's what I used on the GE voter I just put together for a club here. Used HT90's for link rx's. -- Jim Barbour WD8CHL Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Operating a Spectra-TAC Comparator (Voter) without RX encoders.
Seems I can get one or two things done today. I dug out the mentioned aftermarket Spectra Tac tone encoder (ComCenterCorp Voting Tone Encoder) and the Spectra Tac Current Generator Upgrade information. The paperwork has been scanned and sent to both Kevin and Mike. Please ask Mike to put it up on the RB web page if you'd like a copy. chow for now... skipp www.radiowrench.com skipp025 at yahoo.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: CSC CWID unit circuit scans now available
This is great news... some of the mfgrs have long since dropped support for prom based ID units. I've also scanned in the circuit diagram with basic pc board layout and sent the pdf to Mike for the RB Web Page. Please contact Mike for a copy. cheers, skipp (still thinking about the Braut Kevin talked about. I can almost taste Dayton already... ) Eric Lemmon [EMAIL PROTECTED] wrote: Steve, The CWID series of Morse identifiers uses a plug-in PROM which is available from CSC, programmed with your callsign for about $25. The comprehensive manual for the ID-er is also available from CSC for about the same price. Contact Control Signal Corporation at 800-521-2203 or at [EMAIL PROTECTED] 73, Eric Lemmon WB6FLY Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Antenna gurus? Antenna Info sheet available
Skipp - Could you also send me a copy ? Thanks, Charles [EMAIL PROTECTED] --- skipp025 [EMAIL PROTECTED] wrote: I have a pdf scanned page, which describes all the basics of spacing. I announced it last year on this group, made copies available to anyone who emailed me direct and sent a copy of the scan to Mike for the RB Web Page. I can still send out the page if it's not available on the RB Page yet. skipp skipp025 at yahoo.com Laryn Lohman [EMAIL PROTECTED] wrote: --- In Repeater-Builder@yahoogroups.com, lcradio2002 [EMAIL PROTECTED] wrote: Stacking them vertically will compress the vertical radiation pattern, which is what you want. I think the proper spacing would be closer to 1/2 wavelength. Tracy I think the spacing should be closer to .85-1.0 wavelength. As an example, the DB224 and others similar in configuration, no matter what the band, will use this spacing. Laryn K8TVZ Yahoo! Groups Links [EMAIL PROTECTED] __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Re: Duplexer retune / recoax
The length of the jumper cables between the cans has a profound effect upon the insertion loss at the pass frequency, and relatively little effect upon the isolation at the notch frequency. Moreover, the isolation can be just fine with the wrong jumper cables, but the insertion loss will be excessive. YMMV. 73, Eric Lemmon WB6FLY From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Andrew G.Sent: Friday, January 20, 2006 11:32 AMTo: Repeater-Builder@yahoogroups.comSubject: Re: [Repeater-Builder] Re: Duplexer retune / recoax Have you tested it into a dummy load? If you were able to achieve a decent amount of isolation on a service monitor, then I wouldn't think you would need to go through the trouble of re-cabling itJust a thought.. Andy Yahoo! PhotosRing in the New Year with Photo Calendars. Add photos, events, holidays, whatever. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] Re: B D Enterprises 1P controller
--- In Repeater-Builder@yahoogroups.com, Kevin Custer [EMAIL PROTECTED] wrote: hl31943 wrote: That is one option, but I guess we should ask you where you are getting the audio from? Pin 1 of U403, I followed WA6ILQ's article for the most part. I don't know how much audio is actually available from that point, and depending on the component values chosen for de-emp in the 1P controller, an amplifier stage may be required to bring things up to where they belong. This circuit, modified for De-Emp may just work: http://www.repeater-builder.com/rbtip/audioamp.html Another option would be to change the gain of the op-amp stage in the controller. The resistor across the first op-amp can be raised in value to compensate for the loss of audio when you use de-emp. Kevin Thanks, that's similar to a schematic I found on line somewhere. The problem, or part of the problem, is that I don't have any info on the 1P other than what I downloaded on your website. The 1P provides sufficient gain in one setting but I lose DTMF control of the 1P. On the other setting (de-emp, no gain) I can control the 1P but the repeated audio is low. I think the LM386 is the answer. Thanks for the input. Howard Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Duplexer retune / recoax
The length of the jumper cables between the cans has a profound effect upon the insertion loss at the pass frequency, and relatively little effect upon the isolation at the notch frequency. Which brings up a fun question.. How do you know what the right length is, and where do you measure it from? Or is this a cut and try thing? In that case, anyone know sources for bungee coax? :) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX ...
[EMAIL PROTECTED] wrote: Well, I done it on our repeaters. We run SpectraTac. Originally I ran link transmitters constantly keyed. Some are still that way. I have also converted SQM's to use cor from a link receiver. Required replacing the agc cap c9 with a fixed resistor to maintain a constant agc level. Disabling the line fail detector, etc. I even run converted and regular sqm's in the same comparator. I will try to find my manual with the mods if this is of interest. Yes, please Kevin YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] Re: Duplexer retune / recoax
Dave, The vast majority of duplexers will work pretty well with the cables close to the right length. After all, Sinclair offers only two cable harnesses for their Q-202G BpBr duplexers- one for the 136-150 MHz split, and the other for the 150-174 MHz split. I may not have the splits correct, but I do know that there are only two harnesses. You can't simply cut the jumper cables to a certain fraction of the wavelength, because the coupling loops inside the cans are part of the total length. It takes a network analyzer to determine the optimum length, and most folks simply don't feel that it's necessary to go to that extreme. When you order a duplexer from one of the major manufacturers, the bench technician will select a jumper off a rack of jumpers that are arranged in (usually) 1/4 increments. He uses a network analyzer to measure the insertion loss between two cans at a time, and then he will try a longer or a shorter jumper until he finds the optimum. Needless to say, he soon has a list of sweet lengths to start with for each frequency, so it normally takes only a few tries to get it on the nose. It is still a cut and try approach, but it works. The typical spectrum analyzer works in transmission mode, and doesn't have the extreme reflection sensitivity needed to properly tune for bandpass. A good spectrum analyzer with a return-loss bridge can probably be used in place of a network analyzer for this task. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Dave VanHorn Sent: Friday, January 20, 2006 7:17 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Duplexer retune / recoax The length of the jumper cables between the cans has a profound effect upon the insertion loss at the pass frequency, and relatively little effect upon the isolation at the notch frequency. Which brings up a fun question.. How do you know what the right length is, and where do you measure it from? Or is this a cut and try thing? In that case, anyone know sources for bungee coax? :) Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: WTB 162.2 reed for Micor(the right reed this time)
Several people responded about this being the right reed for a Micor, so I looked in the book (DUH!) and what I really need is a TLN8381A. Appararently someone had just stuck this reed in the socket. I dont know if it would have worked or not. Henry --- In Repeater-Builder@yahoogroups.com, hwingate [EMAIL PROTECTED] wrote: I am in need of a 162.2Hz (5B) reed like the KLN6209A for a Micor station I am converting. Will eithr buy outright or swap. Thanks Henry K4HAL (at) CHARTER (dot) NET Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Duplexer retune / recoax
At 1/20/2006 19:16, you wrote: The length of the jumper cables between the cans has a profound effect upon the insertion loss at the pass frequency, and relatively little effect upon the isolation at the notch frequency. Which brings up a fun question.. How do you know what the right length is, and where do you measure it from? Or is this a cut and try thing? In that case, anyone know sources for bungee coax? :) Every now then a trombone line shows up on eBay. Unfortunately, they usually go for a bit more than I'm willing to pay. This isn't something you'd want to leave in line, but if you know the velocity factors physical lengths of it your interconnecting cables, you can figure out the correct fixed length of coax to use. Bob NO6B Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders.
If I can speak up at this point - I am currently in the process of adding Spectra TAC receivers to a repeater system I administer. I'd really like to take a look at those mod sheets that both Skipp and Dan refer to, especially if it will improve receiver operation and voting. Thanks in advance! Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Kevin Custer Sent: Friday, January 20, 2006 6:58 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Operating a Spectra-TAC Comparator (Voter) without RX encoders. Hi Dan, thanks for the reply, snip I have all the manuals and my prints of the mods (including the SRN-1068) which make this comparator actually vote the best reciever properly, if you need them. I have the proper manual, but I don't have the SRN-1068 mod. I would like to have that if you can scan it and send it to me either as a Word, PDF, or JPG, or a photocopy by mail. I'm good in all of the modern online callbooks, www.qrz.com , etc. Also have the factory mod sheets for the receivers as well if you decide to go that way. I'm really not interested in installing the Motorola Spectra-TAC receivers and encoders, since I already have these others installed. Thanks, Kevin Custer W3KKC Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
