[Repeater-Builder] R100 stays keyed up
Hi all, I have a Motorola R100 2-10w UHF repeater on the bench. It was working fine (pulled from of working service) until a frequency programming change (only 25 kHz). Now it stays keyed unless I change the repeater disable switch on the board. It does pass receiver audio normally but the repeater never drops the carrier. In fact it keys up immediately upon power on. I disconnected the receiver to make sure it nothing was causing the transmitter to trigger. I am not too familiar with troubleshooting these repeaters as they have always worked well in the past. Am I looking at a codeplug corruption issue or is it a coincidental hardware issue. Any tips or sharing of common failures appreciated. Thanks. - Rob
Re: [Repeater-Builder] R100 stays keyed up
I'd start at http://www.repeater-builder.com/motorola/r100/r100-index.html and download the service manual. Start at the transmitter PTT line and see if it's pulled low. If it is, backtrack on the schematic / transmitter board and see what's doing it. If it's not, then I'd look at the codeplug. Mike WA6ILQ At 08:52 AM 12/30/09, you wrote: Hi all, I have a Motorola R100 2-10w UHF repeater on the bench. It was working fine (pulled from of working service) until a frequency programming change (only 25 kHz). Now it stays keyed unless I change the repeater disable switch on the board. It does pass receiver audio normally but the repeater never drops the carrier. In fact it keys up immediately upon power on. I disconnected the receiver to make sure it nothing was causing the transmitter to trigger. I am not too familiar with troubleshooting these repeaters as they have always worked well in the past. Am I looking at a codeplug corruption issue or is it a coincidental hardware issue. Any tips or sharing of common failures appreciated. Thanks. - Rob Yahoo! Groups Links
Re: [Repeater-Builder] R100 stays keyed up
Some repeaters have the option of letting the VCO run continuiously and they key the power amp circuits, The benefit is the PTT rise time goes from 50-100mS down to like 4mS. The disadvatage is that any radios in close proximity to the repeater hear the VCO running due to leakage, is that the case here? Do you actually have full power out of the repeater all the time? Also you might try removing the programing cable from the repeater as it appears to share the PTT line.
[Repeater-Builder] WTB Duplexers
Hi all, A previous deal to buy some duplexers fell through for various reasons but the need still exists. Need a set of 4 or 6 can VHF duplexers. Do not have to be tuned to the ham band already - just so that they are tuneable. We can replace the wiring harness and get them re-tuned if necessary. Will drive a reasonable distance to pick up or if you want to ship, will pay shipping. Sinclair, WACOM, brand doesn't matter. Functionality does. Chuck / W3YNI
RE: [Repeater-Builder] WTB Duplexers
Chuck, It would be helpful if you provided some information about the repeater, so that a proper duplexer can be offered. For example, how much TX power and is it a tube or transistor PA? Crystal or synthesized? How sensitive is the receiver, and does it have a helical front end filter (i.e., Micor, Exec II, etc.)? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Charles Mills Sent: Wednesday, December 30, 2009 12:12 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] WTB Duplexers Hi all, A previous deal to buy some duplexers fell through for various reasons but the need still exists. Need a set of 4 or 6 can VHF duplexers. Do not have to be tuned to the ham band already - just so that they are tuneable. We can replace the wiring harness and get them re-tuned if necessary. Will drive a reasonable distance to pick up or if you want to ship, will pay shipping. Sinclair, WACOM, brand doesn't matter. Functionality does. Chuck / W3YNI
Re: [Repeater-Builder] WTB Duplexers
Eric, Thanks to all for the replies so far You are correct that the type of PA is important -- I should have included that. It is either going to be a Maggiore (with a 100 Watt PA added) or a Motorola and am shooting for an MSR2000 but that gear has not been set in stone yet. It will be determined by what we have kicked out way and we don't have a lot of choice in the matter. Furthermore -- duplexers won't be included hence my posting. The PA hence will be transistor based. If a Maggiore it will be rockbound but it may not be a Maggiore. So...that being the case I might be doing this a bit out of order. Like a lot of these types of projects need is high but funding is scarce. On Wed, Dec 30, 2009 at 3:22 PM, Eric Lemmon wb6...@verizon.net wrote: Chuck, It would be helpful if you provided some information about the repeater, so that a proper duplexer can be offered. For example, how much TX power and is it a tube or transistor PA? Crystal or synthesized? How sensitive is the receiver, and does it have a helical front end filter (i.e., Micor, Exec II, etc.)? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Charles Mills Sent: Wednesday, December 30, 2009 12:12 PM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] WTB Duplexers Hi all, A previous deal to buy some duplexers fell through for various reasons but the need still exists. Need a set of 4 or 6 can VHF duplexers. Do not have to be tuned to the ham band already - just so that they are tuneable. We can replace the wiring harness and get them re-tuned if necessary. Will drive a reasonable distance to pick up or if you want to ship, will pay shipping. Sinclair, WACOM, brand doesn't matter. Functionality does. Chuck / W3YNI -- = Charles L. Mills Westmoreland Co. ARES EC Amateur Radio Callsign W3YNI Email: w3y...@gmail.com
Re: [Repeater-Builder] WTB Duplexers
Since we are on the topic, I got a couple scenarios (two) for consideration... 1 kenwood tkr-750k2 (138-150mhz) with 100watt henry pa. 25watts in 100watts out. Or cresend 10watt in 300watts out pa. 2. mastr ii with pll exciter, factory preamp 110w factory pa. - have a set of sinclair Q202G, telewave TPRD-1444(smaller rack mount set about the size of the kenwood rptr) and a set of TX/RX 28-38-03C... Any thoughts? 73 Norm - Original Message - From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Wed Dec 30 14:22:58 2009 Subject: RE: [Repeater-Builder] WTB Duplexers Chuck, It would be helpful if you provided some information about the repeater, so that a proper duplexer can be offered. For example, how much TX power and is it a tube or transistor PA? Crystal or synthesized? How sensitive is the receiver, and does it have a helical front end filter (i.e., Micor, Exec II, etc.)? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Charles Mills Sent: Wednesday, December 30, 2009 12:12 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] WTB Duplexers Hi all, A previous deal to buy some duplexers fell through for various reasons but the need still exists. Need a set of 4 or 6 can VHF duplexers. Do not have to be tuned to the ham band already - just so that they are tuneable. We can replace the wiring harness and get them re-tuned if necessary. Will drive a reasonable distance to pick up or if you want to ship, will pay shipping. Sinclair, WACOM, brand doesn't matter. Functionality does. Chuck / W3YNI
Re: [Repeater-Builder] WTB Duplexers
Chuck, I have a set of DB products VHF cans for close split (4-cavity). Are you interested? Northwest Connecticut. James Delancy Charles Mills wrote: Hi all, A previous deal to buy some duplexers fell through for various reasons but the need still exists. Need a set of 4 or 6 can VHF duplexers. Do not have to be tuned to the ham band already - just so that they are tuneable. We can replace the wiring harness and get them re-tuned if necessary. Will drive a reasonable distance to pick up or if you want to ship, will pay shipping. Sinclair, WACOM, brand doesn't matter. Functionality does. Chuck / W3YNI Yahoo! Groups Links
Re: [Repeater-Builder] R100 stays keyed up
DCFluX wrote: Some repeaters have the option of letting the VCO run continuiously and they key the power amp circuits, The benefit is the PTT rise time goes from 50-100mS down to like 4mS. The disadvatage is that any radios in close proximity to the repeater hear the VCO running due to leakage, is that the case here? Do you actually have full power out of the repeater all the time? Also you might try removing the programing cable from the repeater as it appears to share the PTT line. It is full output (10W) as measured on the Telewave meter. I did remove the programming cable when I did the power cycling. Thanks, - Rob
