The power output is from the a sticker on the front of the transmitter with a hand-written "78" in the watts blank.
The repeater is currently in the 455 range and we have been coordinated the 442.225T/447.225T pair. As guessed, I am located in Columbus, Indiana (about 40 miles south of Indy). Thanks for the help! Brian, WW9A > >From: Mike Morris <[email protected]> >To: [email protected] >Sent: Sun, May 30, 2010 12:22:26 AM >Subject: Re: [Repeater-Builder] Retuning a UHF Motorola Micor without a >deviation meter or signal generator ? > > >At 08:31 PM 05/29/10, you wrote: > >>I will apologize in advance, as I am an extreme newby in the world >>of repeater building / operation. > >No apology needed. We've all had to start somewhere. > >>We've been donated a UHF Motorola Micor system. The system has >>documentation that shows that it once ran at 78W out in commercial service. > >Is that on the "Power Set" sticker, or do you actually >have a station logbook? (very rare). > >>Being an amateur radio operator without a commercial or well-stocked >>test bench, I do not have ready access to a deviation meter or >>signal generator. > >Nobody does when they get started. But both can be "faked". > >>Is it possible to retune these things down to the amateur radio 440 >>band without these two pieces of test equipment? > >Yes, but it is more difficult without them. > >Where is the station now (i.e. frequency) ? > >Where are you going? (i.e. frequency) ? >Do you have a coordination there? > >A peak deviation meter can be faked with a >DC coupled oscilloscope and a discriminator >based receiver, You offset the transmitter + >and - 5khz and adjust the gain so that the display >shifts + and - 5 lines on the scope face. Then >you run enough audio into the transmitter to >saturate the audio stages (i.e. force it into limiting) >and set for 4.8 KHz. Set this way nothing is going >to go beyond that point. Then you adjust the level >from the repeater controller for a 1:1 repeat gain. >There's more to it than that but that will get you >started. > >A signal generator can be faked with a >programmable scanner (you use the local >oscillator / multiplier as an uncalibrated >radiating source). There was a comment >thread on that topic not long ago, you >might want to check the list archives. > >>How likely is it that I will run into significant performance issues >>without these pieces of equipment? > >You might want to say where you are. This mailing list >has almost 5,000 members worldwide, mostly in the USA, >and we might have someone local to you that would >be willing to "Elmer". > >And retuning the station only has to be done once. When >I was getting started I would take the receiver and transmitter >chassis over to a friends 2-way shop, we'd tune them up, >and I'd take them back home and do the rest of the work >there. > >>Thanks! >> >>Brian, WW9A > >Your license comes back to Columbus, Indiana which >is south of Indianapolis. Is that where you are located? > >Mike WA6ILQ > > >
