Huh, my burnishing tool is from the 70's!
-----Original Message----- From: Neil McKie [mailto:[EMAIL PROTECTED] Sent: Monday, December 01, 2003 5:10 PM To: [email protected] Subject: Re: [Re: [[Repeater-Builder] Re: GE Stuff.....]] I had two problems with the base & repeater station Mastr Pro power supplies: ( EP38 Series ) 1) the electrolytic capacitors which had to be replaced every 20 years or so. 2) the cooling fan motor - which needed to be lubricated from time to time. Didn't hurt to burnish the relay contacts from time to time too. I still have the burnishing tool from the sixties. As many of you personally know, there are two variations of the UHF Mastr Pro transmitters: The early version has a 7377 (tube) tripler/driver stage. Tuning was a severe pain as some will remember. Model numbers included: ET-59B and ET-60B The late version has the Varactor Diode tripler stage. Tuning was quite simple in comparison. Model numbers included: ET-59C, D and F; and ET-60C, D You might note, John Mackey. KS0F, has written an excellent paper on the proper care of the UHF Mastr Pro Transmitter. My first repeater was a GE (early) Progress Line - the series that used the 2C39 as a driver and another as the final. The repeater came in various output power ratings. 20 watts for the lower power to 60 or 90 watts for the higher power units. Another repeater used the Motorola T44A6, T44A6A and T44AAV receiver and transmitter strips. (Yes Mike, I have the manuals for those radios of yours here.) Neil McKie Paul Finch wrote: > > John, > > Your correct, the Master Pro was a very good radio, in the shop that > I worked at we did the service for a freight delivery fleet of over > 200 Master Pro's. The only part that I did not like was in the UHF > transmitter where it had a varactor diode tripler. It could and from > time to time did cause serious harmonics and or transmit noise. GE > fixed that problem with the Master II. The only other problem I know > of was with the mobile power supply, the rectifier diodes were poor > quality and they would go bad, we got to where we would just replace > all of the high voltage diodes with M-2.5 Mallory replacements. > > My second repeater was a UHF Master Pro, I removed the 12 volt mobile > power supply and installed a 110 volt Motorola Compa Station supply > (with a few modifications). I built a 10 and 12 volt regulated power > supply and used the repeater controller I had built for my first > repeater. By the way, my first repeater was built out of a T-44 with > a AC power supply. The GE Master Pro repeater worked for years. Sort > of takes you back don't it! > > Also, your very correct about the GE TPL radios, they stunk! > > Paul > > -----Original Message----- > From: JOHN MACKEY [mailto:[EMAIL PROTECTED] > Sent: Monday, December 01, 2003 11:20 AM > To: [email protected] > Subject: Re: [Re: [[Repeater-Builder] Re: GE Stuff.....]] > > The Mastr Pro was a excellent radio, & still it's spec's are very good even > by > today's standard. I still have SEVERAL of the late model Mastr Pro's in > service as repeaters on 6 meters, 2 meters, and 440 MHz in Oregon & > Washington. Their receivers hold up in the most harsh environments. I have > no immediate plans of retiring my Mastr Pro repeaters. > > (Of course, the Micor is no slouch either - I have those on as repeaters in > Iowa) > > Neil McKie <[EMAIL PROTECTED]> wrote: > SNIP > > the Mastr Pro showed the county shop guys all was not lost. > > I know, I was impressed. > SNIP > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
