I'm about 30 minutes north of Dayton - about 3 hours from you, if it comes down to it, you're welcome to come over here, I've got the tools on the bench and a few micor's laying around :)
... if i ever get this one done lol :) --- In [email protected], Brian Smith <lirc1...@...> wrote: > > 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 <wa6...@...> > >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 ? > > > >Â > >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 > > > > > > >
