Re: [Repeater-Builder] Update on the MICOR Community Repeater project
I thought the community repeaters could decode and encode separately. In other words, there's no requirement that the received PL tone match the transmitted PL tone. If that's the case, then the PL decoder is supposed to remove any received PL tone, which sounds exactly like what yours is doing. You would need a separate encode card to feed the transmitter. The decoded PL output signal would be run through a matrix which chooses the proper PL encode tone. You don't want two PL tones feeding the transmitter (one bleeding through from the receiver, one from the encoder). It works this way on any normal repeater. You always want to remove the received PL tone and generate it fresh for the transmit PL tone. Of course, I could be all wrong about this. Bob M. == --- On Sat, 9/20/08, n9wys [EMAIL PROTECTED] wrote: From: n9wys [EMAIL PROTECTED] Subject: [Repeater-Builder] Update on the MICOR Community Repeater project To: Repeater-Builder@yahoogroups.com Date: Saturday, September 20, 2008, 10:33 PM Well, I got this thing all reassembled and tuned up on the new frequency pair… a fellow ham (who used to work for the local Motorola shop) came over with his service monitor and we tuned and tested the system. It is still not passing PL to the transmitter. Some PL bleeds through from the receive, but I know that is not correct – nor is it of sufficient level. (I only get about 90 Hz of deviation with this PL.) We took a CLOSE look at the Master Decoder card itself and it appears to be configured VERY differently than the later version depicted in my manual. For example, the later version card (based on two ICs) has no connection on Pin 24 to the backplane. My card (an earlier version with discreet components) appears to have some sort of signal (audio) on Pin 24. So I need desperately to find either the manual pages pertaining to my older Master Decoder card, or I need a newer version card. If ANYONE has either of these, I’d be much obliged of you would contact me. The issue HAS to be the Master Decoder card – it is not passing any PL to the exciter. The problem is, I have about 8 of the same vintage Master Decoder card, so changing them out is not resolving the issue. For the time being, I am going to put the machine on the air as-is… it works just fine, other than it will have to be CSQ receive for all users. I’ll decide later on whether I will put in a tone panel, or continue to operate it as it is now. Mark – N9WYS / WQIV271
RE: [Repeater-Builder] Update on the MICOR Community Repeater project
Eric, The original thread started 08/11... and (forgive me for the bandwidth usage) I captured most of it here. I did take the liberty to edit out some of the stuff I felt was unimportant or non-productive. At one point in the build, I *thought* I had this problem resolved... but apparently what was happening was the PL was bleeding through from the receive to the transmitter. That is why I was able to talk it off. After looking at the station operation with a service monitor, I am certain that it is NOT encoding PL for transmit. I have no PL at Pin 2 of the Master Decoder, which is what feeds the PL tone to the exciter/modulator. For everyone: At one point, Eric referred me to an eBay auction, listing among other things a Master Decoder card of the same part number as the ones I have. Those cards were in an MSY chassis... which makes me wonder if there is a fundamental difference on the MSY-version versus the MICOR-version of this card. My examination of the card leads me to believe this is the case, I just need to verify this. Eric, the part number stamped on the backplane is: TRN6421A, and the number on the Master Decoder card is: TLN5803A Thanks everyone! Mark - N9WYS / WQIV271 -Copied Thread- From: Repeater-Builder@yahoogroups.com On Behalf Of n9wys Sent: Monday, August 11, 2008 11:26 AM More information about this project. I have the station working - receiving, decoding proper PL tone, repeating, transmitting audio, etc. The only thing it is NOT doing is encoding tone for transmit. (A reminder - this is a Community Repeater MICOR chassis, NOT the standard repeater chassis.) Anyway - from what I can tell, the Master Control module is NOT sending tone out to the modulator. The problem I have is this: the manual supplement I have shows a different Master Control module that what I have. My modules are not IC-based, the ones on the manual are. Therefore, I believe the schematic and operation for the module I have is completely different than that in the manual. Does anyone have an earlier issue of the Community Repeater manual - 68P81025E55 (probably revision A, since mine is a B)? *ALL* I think I need are the pages pertaining to the Master Control Module - part #TLN5803A. (Other part numbers may be: TLN8780A or TLN1684A - these are numbers stamped on the flange of the card - the first number above was printed right on the circuit board.) The module referenced in my manual is TRN6165A. For those with a manual - I am seeing tone at Pin 7 (Tone PL Out) but not at Pin 2 (Tone or Binary PL to Modulator) on the Master Control module. I tried merely jumpering Pin 7 to Pin 2 - doesn't work. Because the schematic and board layout is completely different, I have no reference to be able to chase signal through the circuit. I'm also wondering if a required jumper is missing or a jumper is improperly installed on my Master Control card. Thanks! Mark - N9WYS From: Repeater-Builder@yahoogroups.com On Behalf Of Eric Lemmon Sent: Tuesday, August 12, 2008 9:18 PM Mark, What is the number stamped in black ink directly on the PCB of the master control module? I know you recently received the community repeater manual, and that manual doesn't contain the information on that module? Odd... 73, Eric Lemmon WB6FLY Eric, The Master Control module I have is: TLN5803A The module referenced in my manual is: TRN6165A. The manual's module is definitely a newer design - it is IC-based (two chips on the board). My modules are pre-IC -- no chips at all. I've also seen cover designs for (what I believe is) an earlier version of the Comm. Rptr. manual supplement, so there is at least one version prior to the one I have... Mark - N9WYS From: Repeater-Builder@yahoogroups.com On Behalf Of Mark Sent: Sunday, August 17, 2008 12:59 PM Before the last hiatus, I was attempting to find a schematic for a MICOR Master Control module, part # TLN5803A. I still am in need of it. Does anybody have a first edition MICOR Community Repeater manual supplement that may have this schematic in it? My manual is a later issue, and doesn't not contain what I need. I would be greatly appreciative if someone could locate this and scan it for me! This module schematic may also be in a MOTRAC manual, if that helps anyone in locating this module for me. (I have found the module installed in a MOTRAC repeater.) Thanks! Mark - N9WYS From: n9wys [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 19, 2008 3:48 PM Everyone, today I tried contacting Motorola parts for a manual and/or schematic for the Master Decoder module I have, Part #TLN5803A. Needless to say, navigating Motorola's call-handling system was a real trip. First I ended up with someone in Cell Phones, then someone in Recreational Radio. I finally ended up with Don in Commercial Radio... Don put life and limb at risk by venturing into the old archives. Unfortunately they no longer have any manuals available which refer to this module. :-(
RE: [Repeater-Builder] Update on the MICOR Community Repeater project
Mark, Now, I'm the one who is confused! I just looked at a UHF community repeater and noticed that it has a TRN6421APR backplane. However, it is equipped with a TRN6165A Master Decoder. I therefore wonder if the TLN5803A Master Decoder you have even belongs to that machine. I confirmed, as you did, that Pin 24 on the TRN6165A Master Decoder has no connection. Is it possible that the previous owner simply stuffed the chassis with leftover pull-outs? The TRN6421APR backplane PCB has the following module assignments, right to left: 1 - Timeout Timer 2 - Station Control 3 - Squelch Gate 4 - Single Tone Decoder 5 - Master Decoder 6 - Four-User Control 7 - Ditto 8 - Ditto 9 - Ditto 10 - Diode Logic 11 - Multi-TPL Encoder 12 - Multi DPL Encoder I have no manuals for a Community Repeater, so I do not have any means to follow the signal path via schematics. That said, it seems to me that a Multi-TPL Encoder in Slot 11 would generate the unique PL tone that the repeater would transmit. You did not state if such a module was installed in your station, so I wonder if that is why your station is not encoding the tone. As others have noted, it is always preferable to filter out and then regenerate a PL tone, rather than allow it to pass through a repeater. The reason for that is two-fold: Some cheap user radios have very poor tone purity, and may be difficult to decode, and some user radios have widely-varying tone deviation that range from not enough to double or triple the proper level. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of n9wys Sent: Sunday, September 21, 2008 9:04 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Update on the MICOR Community Repeater project Eric, The original thread started 08/11... and (forgive me for the bandwidth usage) I captured most of it here. I did take the liberty to edit out some of the stuff I felt was unimportant or non-productive. At one point in the build, I *thought* I had this problem resolved... but apparently what was happening was the PL was bleeding through from the receive to the transmitter. That is why I was able to talk it off. After looking at the station operation with a service monitor, I am certain that it is NOT encoding PL for transmit. I have no PL at Pin 2 of the Master Decoder, which is what feeds the PL tone to the exciter/modulator. For everyone: At one point, Eric referred me to an eBay auction, listing among other things a Master Decoder card of the same part number as the ones I have. Those cards were in an MSY chassis... which makes me wonder if there is a fundamental difference on the MSY-version versus the MICOR-version of this card. My examination of the card leads me to believe this is the case, I just need to verify this. Eric, the part number stamped on the backplane is: TRN6421A, and the number on the Master Decoder card is: TLN5803A Thanks everyone! Mark - N9WYS / WQIV271 -Copied Thread- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com On Behalf Of n9wys Sent: Monday, August 11, 2008 11:26 AM More information about this project. I have the station working - receiving, decoding proper PL tone, repeating, transmitting audio, etc. The only thing it is NOT doing is encoding tone for transmit. (A reminder - this is a Community Repeater MICOR chassis, NOT the standard repeater chassis.) Anyway - from what I can tell, the Master Control module is NOT sending tone out to the modulator. The problem I have is this: the manual supplement I have shows a different Master Control module that what I have. My modules are not IC-based, the ones on the manual are. Therefore, I believe the schematic and operation for the module I have is completely different than that in the manual. Does anyone have an earlier issue of the Community Repeater manual - 68P81025E55 (probably revision A, since mine is a B)? *ALL* I think I need are the pages pertaining to the Master Control Module - part #TLN5803A. (Other part numbers may be: TLN8780A or TLN1684A - these are numbers stamped on the flange of the card - the first number above was printed right on the circuit board.) The module referenced in my manual is TRN6165A. For those with a manual - I am seeing tone at Pin 7 (Tone PL Out) but not at Pin 2 (Tone or Binary PL to Modulator) on the Master Control module. I tried merely jumpering Pin 7 to Pin 2 - doesn't work. Because the schematic and board layout is completely different, I have no reference to be able to chase signal through the circuit. I'm also wondering if a required jumper is missing or a jumper is improperly installed on my Master Control card. Thanks! Mark - N9WYS From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com On Behalf Of Eric Lemmon Sent: Tuesday, August 12, 2008 9:18 PM Mark, What is the number stamped in black ink directly on the PCB of the
[Repeater-Builder] Motorola MICOR Receiver enclosure questions
I recently picked up a 72-MHz MICOR receiver off of the big auction site (won't mention the name lest someone get all [EMAIL PROTECTED]!).. This MICOR receiver appears to be in a 3-1/2 high MSF-5000 series box, with the spring-loaded releases on the black front panel. It has a squelch control and an RJ-series jack on the front panel, and the rear panel has a BNC antenna jack, along with a 10-pin male plug. The Motorola P/N stamped on the rear is TRC1072AB, which might be just something like the rear panel number and not the complete assembly number. Does anyone know what series station this receiver was used in? I'd like to find the hookup info for it, and find a part number the 10-pin matching connector. I have plenty of actual MICOR receiver info, for receivers of all bands, and would like to use this as a UHF control receiver for a 2-Meter repeater. Repeated request for info emails to the original seller have not been responded to, so Im trying here. One person in our shop felt it might be part of an MSF-5000 sereis paging station, with this 72-MHZ receiver used for control (maybe similar to a 330W MICOR PURC station on 42 MHz with its 72-MHz receiver, which I have sitting in my garage.) Larry
[Repeater-Builder] Re: Motorola MICOR Receiver enclosure questions
Larry, I think you are headed in the right direction. I have most of a MSF-5000 purc station and it has a UHF receiver much as you described your 72 MHz receiver. I was surprised when I removed the covers and found a Micor UHF receiver and Micor PL decoder inside the chassis. I have the receiver, exciter, control shelf and some other misc parts from the station. I am still not sure which software to use to program the control shelf, but I figured International Crystal could reprogram the receiver and exciter to the new channel. I have a PURC5000 manual. If it covers the receive chassis that we both have, the connector pinout should be the same. When I get back to the house I will go have a look. 73, Joe --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I recently picked up a 72-MHz MICOR receiver off of the big auction site (won't mention the name lest someone get all [EMAIL PROTECTED]!).. This MICOR receiver appears to be in a 3-1/2 high MSF-5000 series box, with the spring-loaded releases on the black front panel. It has a squelch control and an RJ-series jack on the front panel, and the rear panel has a BNC antenna jack, along with a 10-pin male plug. The Motorola P/N stamped on the rear is TRC1072AB, which might be just something like the rear panel number and not the complete assembly number. Does anyone know what series station this receiver was used in? I'd like to find the hookup info for it, and find a part number the 10-pin matching connector. I have plenty of actual MICOR receiver info, for receivers of all bands, and would like to use this as a UHF control receiver for a 2-Meter repeater. Repeated request for info emails to the original seller have not been responded to, so Im trying here. One person in our shop felt it might be part of an MSF-5000 sereis paging station, with this 72-MHZ receiver used for control (maybe similar to a 330W MICOR PURC station on 42 MHz with its 72-MHz receiver, which I have sitting in my garage.) Larry
[Repeater-Builder] Re: Update on the MICOR Community Repeater project
Mark, Sorry to hear that you are still fighting this problem. I think we were on the right track when this kinda ended last month, in that what you need to find is a Motrac series community repeater manual that might show the TLN5803A Master Decoder. I have not been able to turn one up yet. I do have one question for you about the original configuration in these stations. Did they originally have a Diode Logic and a Multiple TPL Encoder card installed in them? I am sure you have answered this question already, but I really do not remember. If you still have my number, give me a call and we can talk on the phone. I have misplaced your phone number. 73, Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, n9wys [EMAIL PROTECTED] wrote: Well, I got this thing all reassembled and tuned up on the new frequency pair. a fellow ham (who used to work for the local Motorola shop) came over with his service monitor and we tuned and tested the system. It is still not passing PL to the transmitter. Some PL bleeds through from the receive, but I know that is not correct - nor is it of sufficient level. (I only get about 90 Hz of deviation with this PL.) We took a CLOSE look at the Master Decoder card itself and it appears to be configured VERY differently than the later version depicted in my manual. For example, the later version card (based on two ICs) has no connection on Pin 24 to the backplane. My card (an earlier version with discreet components) appears to have some sort of signal (audio) on Pin 24. So I need desperately to find either the manual pages pertaining to my older Master Decoder card, or I need a newer version card. If ANYONE has either of these, I'd be much obliged of you would contact me. The issue HAS to be the Master Decoder card - it is not passing any PL to the exciter. The problem is, I have about 8 of the same vintage Master Decoder card, so changing them out is not resolving the issue. For the time being, I am going to put the machine on the air as-is. it works just fine, other than it will have to be CSQ receive for all users. I'll decide later on whether I will put in a tone panel, or continue to operate it as it is now. Mark - N9WYS / WQIV271
Re: [Repeater-Builder] Update on the MICOR Community Repeater project
Mark, I have a manual for a 68P1056A35 MOTRAC C74MSY-3101AY and BY community repeater. It shows the BY uses a TLN1684A master decode. I didn't come forward before because I didn't see that number mentioned. part # TLN5803A is the kit number for the master decode board in a TLN1684A module. Pin 24 on the card should be exciter gnd for the xmit pl level pot. If I can get a decent copy, I'll send you what I have. Gerald Pelnar WD0FYF McPherson, Ks - Original Message - From: n9wys [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, September 21, 2008 11:04 AM Subject: RE: [Repeater-Builder] Update on the MICOR Community Repeater project Eric, The original thread started 08/11... and (forgive me for the bandwidth usage) I captured most of it here. I did take the liberty to edit out some of the stuff I felt was unimportant or non-productive. At one point in the build, I *thought* I had this problem resolved... but apparently what was happening was the PL was bleeding through from the receive to the transmitter. That is why I was able to talk it off. After looking at the station operation with a service monitor, I am certain that it is NOT encoding PL for transmit. I have no PL at Pin 2 of the Master Decoder, which is what feeds the PL tone to the exciter/modulator. For everyone: At one point, Eric referred me to an eBay auction, listing among other things a Master Decoder card of the same part number as the ones I have. Those cards were in an MSY chassis... which makes me wonder if there is a fundamental difference on the MSY-version versus the MICOR-version of this card. My examination of the card leads me to believe this is the case, I just need to verify this. Eric, the part number stamped on the backplane is: TRN6421A, and the number on the Master Decoder card is: TLN5803A Thanks everyone! Mark - N9WYS / WQIV271 -Copied Thread- From: Repeater-Builder@yahoogroups.com On Behalf Of n9wys Sent: Monday, August 11, 2008 11:26 AM More information about this project. I have the station working - receiving, decoding proper PL tone, repeating, transmitting audio, etc. The only thing it is NOT doing is encoding tone for transmit. (A reminder - this is a Community Repeater MICOR chassis, NOT the standard repeater chassis.) Anyway - from what I can tell, the Master Control module is NOT sending tone out to the modulator. The problem I have is this: the manual supplement I have shows a different Master Control module that what I have. My modules are not IC-based, the ones on the manual are. Therefore, I believe the schematic and operation for the module I have is completely different than that in the manual. Does anyone have an earlier issue of the Community Repeater manual - 68P81025E55 (probably revision A, since mine is a B)? *ALL* I think I need are the pages pertaining to the Master Control Module - part #TLN5803A. (Other part numbers may be: TLN8780A or TLN1684A - these are numbers stamped on the flange of the card - the first number above was printed right on the circuit board.) The module referenced in my manual is TRN6165A. For those with a manual - I am seeing tone at Pin 7 (Tone PL Out) but not at Pin 2 (Tone or Binary PL to Modulator) on the Master Control module. I tried merely jumpering Pin 7 to Pin 2 - doesn't work. Because the schematic and board layout is completely different, I have no reference to be able to chase signal through the circuit. I'm also wondering if a required jumper is missing or a jumper is improperly installed on my Master Control card. Thanks! Mark - N9WYS From: Repeater-Builder@yahoogroups.com On Behalf Of Eric Lemmon Sent: Tuesday, August 12, 2008 9:18 PM Mark, What is the number stamped in black ink directly on the PCB of the master control module? I know you recently received the community repeater manual, and that manual doesn't contain the information on that module? Odd... 73, Eric Lemmon WB6FLY Eric, The Master Control module I have is: TLN5803A The module referenced in my manual is: TRN6165A. The manual's module is definitely a newer design - it is IC-based (two chips on the board). My modules are pre-IC -- no chips at all. I've also seen cover designs for (what I believe is) an earlier version of the Comm. Rptr. manual supplement, so there is at least one version prior to the one I have... Mark - N9WYS From: Repeater-Builder@yahoogroups.com On Behalf Of Mark Sent: Sunday, August 17, 2008 12:59 PM Before the last hiatus, I was attempting to find a schematic for a MICOR Master Control module, part # TLN5803A. I still am in need of it. Does anybody have a first edition MICOR Community Repeater manual supplement that may have this schematic in it? My manual is a later issue, and doesn't not contain what I need. I would be greatly appreciative if someone could locate this and scan
Re: [Repeater-Builder] Motorola MICOR Receiver enclosure questions
Sounds like the 72 MHz RX option for the PURC 5000 series radio. A seperate manual as I recall. Try Moto parts ID for more info. Milt N3LTQ - Original Message - From: [EMAIL PROTECTED] [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, September 21, 2008 1:35 PM Subject: [Repeater-Builder] Motorola MICOR Receiver enclosure questions I recently picked up a 72-MHz MICOR receiver off of the big auction site (won't mention the name lest someone get all [EMAIL PROTECTED]!).. This MICOR receiver appears to be in a 3-1/2 high MSF-5000 series box, with the spring-loaded releases on the black front panel. It has a squelch control and an RJ-series jack on the front panel, and the rear panel has a BNC antenna jack, along with a 10-pin male plug. The Motorola P/N stamped on the rear is TRC1072AB, which might be just something like the rear panel number and not the complete assembly number. Does anyone know what series station this receiver was used in? I'd like to find the hookup info for it, and find a part number the 10-pin matching connector. I have plenty of actual MICOR receiver info, for receivers of all bands, and would like to use this as a UHF control receiver for a 2-Meter repeater. Repeated request for info emails to the original seller have not been responded to, so Im trying here. One person in our shop felt it might be part of an MSF-5000 sereis paging station, with this 72-MHZ receiver used for control (maybe similar to a 330W MICOR PURC station on 42 MHz with its 72-MHz receiver, which I have sitting in my garage.) Larry Yahoo! Groups Links
[Repeater-Builder] Attn: Sean Stepanek
Sean, I have been answering your emails regarding the repeater and they all bounce back to me as undeliverable. Do you have another email address I can try? Randy
RE: [Repeater-Builder] Motorola MICOR Receiver enclosure questions
I agree. It's probably the PURC5000 Link Receiver option C659 to C663, or C850. The manual 6881064E10 is still available from Motorola Parts for about $17. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Milt Sent: Sunday, September 21, 2008 12:17 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Motorola MICOR Receiver enclosure questions Sounds like the 72 MHz RX option for the PURC 5000 series radio. A separate manual as I recall. Try Moto parts ID for more info. Milt N3LTQ - Original Message - From: [EMAIL PROTECTED] mailto:larryjspammenot%40teleport.com [EMAIL PROTECTED] mailto:larryj%40teleport.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Sunday, September 21, 2008 1:35 PM Subject: [Repeater-Builder] Motorola MICOR Receiver enclosure questions I recently picked up a 72-MHz MICOR receiver off of the big auction site (won't mention the name lest someone get all [EMAIL PROTECTED]!).. This MICOR receiver appears to be in a 3-1/2 high MSF-5000 series box, with the spring-loaded releases on the black front panel. It has a squelch control and an RJ-series jack on the front panel, and the rear panel has a BNC antenna jack, along with a 10-pin male plug. The Motorola P/N stamped on the rear is TRC1072AB, which might be just something like the rear panel number and not the complete assembly number. Does anyone know what series station this receiver was used in? I'd like to find the hookup info for it, and find a part number the 10-pin matching connector. I have plenty of actual MICOR receiver info, for receivers of all bands, and would like to use this as a UHF control receiver for a 2-Meter repeater. Repeated request for info emails to the original seller have not been responded to, so Im trying here. One person in our shop felt it might be part of an MSF-5000 sereis paging station, with this 72-MHZ receiver used for control (maybe similar to a 330W MICOR PURC station on 42 MHz with its 72-MHz receiver, which I have sitting in my garage.) Larry Yahoo! Groups Links
Re: [Repeater-Builder] Motorola MICOR Receiver enclosure questions
One of my 900 MHz PURC5000 manuals has several Micor receivers in it, including 72 MHz. There's also a section that seems to cover the chassis, although I don't know if it's the same one you have. It might be. One board has a squelch pot and an RJ45 jack on it. If that's mounted directly behind the front panel, then it just could be the same board. There's also room inside the chassis for a DPL decoder board and a flat audio board. I suspect these same modules would fit into a SpectraTAC chassis but I haven't checked the pinouts. There's a ribbon cable from the main interface board to the rear panel. The schematic shows the pinout of that connector. Nothing magic but the flat cable does make a mess of the various signals. I would expect you could put ANY wide-band Micor receiver into the unit and it would work just fine. I don't know how the unit interfaces with the parent station, but obviously it can be done. I thought I had a full manual for that exact chassis. I still might; just haven't come across it yet. Bob M. == --- On Sun, 9/21/08, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: From: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: [Repeater-Builder] Motorola MICOR Receiver enclosure questions To: Repeater-Builder@yahoogroups.com Date: Sunday, September 21, 2008, 1:35 PM I recently picked up a 72-MHz MICOR receiver off of the big auction site (won't mention the name lest someone get all [EMAIL PROTECTED]!).. This MICOR receiver appears to be in a 3-1/2 high MSF-5000 series box, with the spring-loaded releases on the black front panel. It has a squelch control and an RJ-series jack on the front panel, and the rear panel has a BNC antenna jack, along with a 10-pin male plug. The Motorola P/N stamped on the rear is TRC1072AB, which might be just something like the rear panel number and not the complete assembly number. Does anyone know what series station this receiver was used in? I'd like to find the hookup info for it, and find a part number the 10-pin matching connector. I have plenty of actual MICOR receiver info, for receivers of all bands, and would like to use this as a UHF control receiver for a 2-Meter repeater. Repeated request for info emails to the original seller have not been responded to, so Im trying here. One person in our shop felt it might be part of an MSF-5000 sereis paging station, with this 72-MHZ receiver used for control (maybe similar to a 330W MICOR PURC station on 42 MHz with its 72-MHz receiver, which I have sitting in my garage.) Larry
[Repeater-Builder] Mocom - Motrac receiver on 6 Meters
Does the Motrac style preselector tune on the high end of 6 Meters, 53.7 MHz without capacitor changes? It seems that modifications to the preselector would be difficult, as it appears to be hand wired - assembled. Breaking a coil seems easy to do.
[Repeater-Builder] Re: Mocom - Motrac receiver on 6 Meters
I can't be 100% sure about your particular radio, but years ago I had a Motrac on 52.525 and I do not remember changing any parts. It was a high split radio on 47 MHz. I do remember it had the noise blanker option and it tuned up very well and met rated sensitivity and the power out was right on also. I had it in my old 4WD ford pickup for close to 10 years, and it never gave me any trouble at all. Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, kq2h [EMAIL PROTECTED] wrote: Does the Motrac style preselector tune on the high end of 6 Meters, 53.7 MHz without capacitor changes? It seems that modifications to the preselector would be difficult, as it appears to be hand wired - assembled. Breaking a coil seems easy to do.
Re: [Repeater-Builder] Mocom - Motrac receiver on 6 Meters
I have tuned Motrac L receivers (both extender and non-extender versions) to 52.525 MHz and 53.29 MHz and the front ends tuned up fine with no slugs visibly near the edge of their range. What you will have to change on the Motrac L receiver in the injection chain. 3 caps need to be lowered in value. -- Original Message -- Received: Sun, 21 Sep 2008 08:08:59 PM PDT From: kq2h [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Mocom - Motrac receiver on 6 Meters Does the Motrac style preselector tune on the high end of 6 Meters, 53.7 MHz without capacitor changes? It seems that modifications to the preselector would be difficult, as it appears to be hand wired - assembled. Breaking a coil seems easy to do.
[Repeater-Builder] Re: Motorola MICOR Receiver enclosure questions
Thia unit is a slide-out drawer from a PURC5000 paging transmitter. It was used as a 72MHz link receiver to receive analog modem tones from a paging control point. The audio then fed the controller in the PURC5000 to digitally moduate the transmitter with Pocsag or other data. These drawer units make great stand alone repeater receivers or link receivers. I've used a few as link receivers wired to ports on a multi-port repeater controller, The 10-pin connector on the rear provides audio, cos, pl detect, and feeds the unit its +12v and ground connections. It is the same type of connector used to connect a COM port DB9/25 jack to a motherboard inside a pc. The unit houses a Micor RF/IF board and a slightly modified Micor base station version audio/squelch board. The difference is that that resistor/capacitor network on the preamp stage is tailored for flat audio (to accomodate the paging modem tones). You can simply compare this stage to a Micor base/repeater to make it the same. I usually remove the 0.0056 cap and install a 12k resistor on a repeater board - this gives a nice response to match the Micor exciters. I think this version board has a 15k resistor and no cap, so the the low end response is down a few db. You can experiment to tailor the stage to your preference. One other thing - since this was a 72MHz version, most likely there is a cap or two (or three) in the squelch circuit that has been optimized for a 72MHz receiver - once again simply compare the board to the VHF/UHF station manual, and you can easily convert it to a VHF/UHF version. If you neglect to change the two or three caps involved, the worst case is that the squelch control may need to be higher than normal for closure. At least that has been my experience when using an unmodified board from a mid-band station in a VHF or UHF Micor station. Rather than messing with that connector, which by the way was fed with nothing more than a ribbon cable, and could cause potential duplex issues, simply take an 8-conductor 22ga shielded cable and hard-wire it into the unit's main interconnect board. Then take the other end and install whatever connector you need for your controller. And use a piece of dc power zip cord for the dc connections. BTW, there is a separate manual for this receiver. It came as an addition to the PURC5000 Paging Station manual. It covers the main chassis interconnect board, the various version audio/squelch boards, and almost every Micor RF/IF board from 30MHz thru 900MHz. I think I have a spare copy in my office somewhere. Anyone care to scan it for the RB site? If so they can have it. Eric KE2D --- In Repeater-Builder@yahoogroups.com, Bob M. [EMAIL PROTECTED] wrote: One of my 900 MHz PURC5000 manuals has several Micor receivers in it, including 72 MHz. There's also a section that seems to cover the chassis, although I don't know if it's the same one you have. It might be. One board has a squelch pot and an RJ45 jack on it. If that's mounted directly behind the front panel, then it just could be the same board. There's also room inside the chassis for a DPL decoder board and a flat audio board. I suspect these same modules would fit into a SpectraTAC chassis but I haven't checked the pinouts. There's a ribbon cable from the main interface board to the rear panel. The schematic shows the pinout of that connector. Nothing magic but the flat cable does make a mess of the various signals. I would expect you could put ANY wide-band Micor receiver into the unit and it would work just fine. I don't know how the unit interfaces with the parent station, but obviously it can be done. I thought I had a full manual for that exact chassis. I still might; just haven't come across it yet. Bob M. == --- On Sun, 9/21/08, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: From: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: [Repeater-Builder] Motorola MICOR Receiver enclosure questions To: Repeater-Builder@yahoogroups.com Date: Sunday, September 21, 2008, 1:35 PM I recently picked up a 72-MHz MICOR receiver off of the big auction site (won't mention the name lest someone get all [EMAIL PROTECTED]!).. This MICOR receiver appears to be in a 3-1/2 high MSF-5000 series box, with the spring-loaded releases on the black front panel. It has a squelch control and an RJ-series jack on the front panel, and the rear panel has a BNC antenna jack, along with a 10-pin male plug. The Motorola P/N stamped on the rear is TRC1072AB, which might be just something like the rear panel number and not the complete assembly number. Does anyone know what series station this receiver was used in? I'd like to find the hookup info for it, and find a part number the 10-pin matching connector. I have plenty of actual MICOR receiver info, for receivers of all bands, and would like to use this as a UHF control receiver for a 2-Meter repeater.
