Re: [Repeater-Builder] 900mhz Mastr II repeaters
-- Sent from my Palm Pre Dan wrote: I have a set of 3 MASTR II 900mhz repeaters that i am going to part out. These were part of a trucking system. They all still have the GETC controllers with them. Sorry but I do not have the MO. Is there anyone interested in any of the parts from these oldies but goodies? I had planned on using them for a 900mhz repeater but found a Motorola MSF-5000 that was a lot easier to get into the ham bands. Drop me an email if you have any interest and we will see what we can do. Dan
[Repeater-Builder] Re: 900mhz Mastr II repeaters
--- In Repeater-Builder@yahoogroups.com, Dan n0...@... wrote: I have a set of 3 MASTR II 900mhz repeaters that i am going to part out. These were part of a trucking system. They all still have the GETC controllers with them. Sorry but I do not have the MO. Is there anyone interested in any of the parts from these oldies but goodies? I had planned on using them for a 900mhz repeater but found a Motorola MSF-5000 that was a lot easier to get into the ham bands. Drop me an email if you have any interest and we will see what we can do. Dan forgot to add that I also have the 26volt power supplies that go with these repeaters. No puny 12 volters here
[Repeater-Builder] Re: Power Supply for Repeater
--- In Repeater-Builder@yahoogroups.com, agrimm0034 agrimm0...@... wrote: GMRS home brewed repeater with a 25 watt maxtrac receiving and the transmit radio is a m1225 40 watt. The power supply on it now is around 6 amps and will not handle the load when radio transmits. Can anyone give me a approximate amp power supply I need. I found how to build a 10 amp power supply but I'm still not sure that will be enough. I would go for something in the 12-15 amp range. That way you have plenty of amps and the supply doesnt have to run at full load all the time.
RE: [Repeater-Builder] Power Supply for Repeater
The MaxTrac service manual states that 1.5 amperes is drawn during receive, and the M1225 service manual states that the 40-watt UHF radio draws 12.5 amperes during transmit. If we allow 1/2 ampere for the controller, the worst-case current load is about 14.5 amperes. The best choice for repeater service is a power supply rated for continuous load of 15 amperes, minimum, and an Astron RS-20 would be a good choice. However, the M1225 will burn up in short order if run at 40 watts in repeater service, so it should be dialed back to perhaps 25 watts, with a fan blowing on its heat-sink fins. This will reduce its current draw to perhaps 9 amperes, but the fan will add perhaps 1/4 ampere. Even at the low power setting, you're still looking at a continuous load of perhaps 11 amperes, and again the Astron RS-20 is a good choice. Keep in mind that power supply ratings are usually based on intermittent loads, and the continuous load ratings are always lower and often are fine print specifications. If you are determined to build your own power supply from scratch, choose a design that can provide 20 amperes. I think you'll find that the parts costs of a home-brewed power supply in the 20-ampere class comes pretty close to what a commercial power supply costs. When you add the cost of a nice cabinet, you may not save a dime by building it yourself. Choose wisely... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of agrimm0034 Sent: Friday, June 05, 2009 11:32 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Power Supply for Repeater GMRS home brewed repeater with a 25 watt maxtrac receiving and the transmit radio is a m1225 40 watt. The power supply on it now is around 6 amps and will not handle the load when radio transmits. Can anyone give me a approximate amp power supply I need. I found how to build a 10 amp power supply but I'm still not sure that will be enough.
[Repeater-Builder] Re: Quantar widlcard question
I'll post the numbers tomorrow. - --- In Repeater-Builder@yahoogroups.com, rahwayflynn mafl...@... wrote: 1K is for the SAM option is less then half the cost of using a Zetron HEAR decoder. Might you have part numbers so I can add it to the MOL account?
RE: [Repeater-Builder] MSF Squelch EEpot
Doesn't that (squelch tail without reverse burst) already occur? If so, I'm not particularly worried about it. Mark - N9WYS _ From: Repeater-Builder@yahoogroups.com On Behalf Of James Delancy PL only squelch will work solely on the PL detect function of the station. This means that if the PL coming out of the user radio is good and clean, it will hear to the noise floor. That also means that if the user radios do not have reverse burst on them, then every unkey will yield a burst of squelch noise. James N9WYS wrote: Adam... My experience with a C85GFB is that my squelch also seems a bit tight, but so far I have not been able to do anything about it. I set it to threshold when I had the service monitor on it, and the station was within specifications. FWIW - I currently have the station set for AND squelch, but have been told that PL-only squelch may be a bit more forgiving. I just haven't had an opportunity to get to the tower and change the setting to see for myself whether this is true. Mark - N9WYS No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.56/2161 - Release Date: 06/07/09 17:53:00
[Repeater-Builder] 19D424984 G1 Tx Monitor panel
Has anyone any information on this panel. I searched the LBI's but nothing. Google also wasn't much help. It is a GE panel from all the numbers it has on it and since the directional coupler uses UHF connectors, I would suggest that it is for VHF. Any help would be appreciated. Doug VE5DA
RE: [Repeater-Builder] 19D424984 G1 Tx Monitor panel
Doug, The 19D424984G1 is an IMTS Station Voltage Control Panel. It is designed to run on either -48 VDC or -24 VDC, and is intended for controlling the output power of 50 or 100 watt GE Mastr II IMTS (Improved Mobile Telephone System) base station transmitters. One of its functions is to cut back on the output power during intervals when only the idle tone is transmitted. The specific band in which the panel operates is determined by the part number of the RF Detector Module: 19D424785G1 is low band 19D424785G2 is high band 19D424785G3 is UHF The manual that covers this unit is LBI-8878, but alas, this LBI is so rare that it was not scanned for the GE LBI database. Needless to say, IMTS went away many years ago as cellular technologies took hold. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Doug Sent: Sunday, June 07, 2009 7:04 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 19D424984 G1 Tx Monitor panel Has anyone any information on this panel. I searched the LBI's but nothing. Google also wasn't much help. It is a GE panel from all the numbers it has on it and since the directional coupler uses UHF connectors, I would suggest that it is for VHF. Any help would be appreciated. Doug VE5DA
Re: [Repeater-Builder] 19D424984 G1 Tx Monitor panel
This is still one of my all-time favorite oxymorons! ;^) - Paul, AE4KR - Original Message - From: Doug To: Repeater-Builder@yahoogroups.com Sent: Sunday, June 07, 2009 8:03 PM Subject: [Repeater-Builder] 19D424984 G1 Tx Monitor panel ...since the directional coupler uses UHF connectors, I would suggest that it is for VHF. .
RE: [Repeater-Builder] 19D424984 G1 Tx Monitor panel
At 08:36 PM 07/06/2009, you wrote: Doug, The 19D424984G1 is an IMTS Station Voltage Control Panel. It is designed to run on either -48 VDC or -24 VDC, and is intended for controlling the output power of 50 or 100 watt GE Mastr II IMTS (Improved Mobile Telephone System) base station transmitters. One of its functions is to cut back on the output power during intervals when only the idle tone is transmitted. The specific band in which the panel operates is determined by the part number of the RF Detector Module: 19D424785G1 is low band 19D424785G2 is high band 19D424785G3 is UHF The manual that covers this unit is LBI-8878, but alas, this LBI is so rare that it was not scanned for the GE LBI database. Needless to say, IMTS went away many years ago as cellular technologies took hold. 73, Eric Lemmon WB6FLY - Thanks very much for that info Eric... I picked one up for the right price and was wondering if it would be of any use in our MSTR II repeater system. But, it sounds like it is not... Interesting thing tho.. Has two directional couplers built into a small box and a nice meter. The two couplers are probably calibrated for the power set functions. One high and one low Would sure like to of had a schematic for it Oh well flea bait now... thanks 73 Doug
