JOHN MACKEY wrote: > > Regarding the Mastr Pro UHF, I was mostly referring to the early > model, but even the late model can be tricky if you are not familar > with it & know what to do. However, the late model (once running > correctly) is highly reliable & that is why I have built so many > repeaters from them.
The early transmitter was the real squirrely one ... an 8106 driving a 7377 (7737?) tripler tube. The later transmitter used an 8106 driving an 8156 to a varactor diode. The output of either tripler stage drives the 8072 final. > I think the first UHF radio I ever tuned up was an HT-200. What a > nightmare that was. In my book, it gets the award for being the > worst varacter tripler radio ever made! Tuned up & running it > worked OK, but getting it there was sure a bitch. It is a lot of > work to go thru for about 1/2 watt (even though the documentation > says 7/10 watt). I agree, that was another squirrel ... > The first commercial rig I tuned was a Moto T-power low-band on > 29.6 MHz. That really threw me since I was getting TWO peaks on > tuning stages. Then I found that the meter was reverse polarity > for how Moto had the tuning voltages. Reversing the polarity of > the VOM gave me ONE SOLID peak on tuning. Yup, works better that way. > That sure was a good 10 meter FM radio & it talked all over!! > Later, I decided it would be a good idea to upgrade to general. I think my first Motorola radio was the FMTRU-5V ... 7 watts out on the 150 MHz band. My first 440 MHz band radio was the Motorola T44A6A ... the receiver was a triple conversion model ... the first and second IF's were known as walking IF's: The first IF was in the 72-73 ??? MHz range / the second IF was in the 8-9 MHz range. The exact numbers I don't remember any more but, if anyone is curious, I do have the Instruction Manual ... Neil - WA6KLA > ------ Original Message ------ > Received: Tue, 04 Jan 2005 04:45:08 PM CST > From: Neil McKie <[EMAIL PROTECTED]> > To: [email protected] > Subject: Re: [Repeater-Builder] Mobile Repeaters? > > > > > > > This discussion is getting interesting ... :) > > > > JOHN MACKEY wrote: > > > > > > I would think that if you are talking about *CORRECTLY* tuning the > > > Motran for continous duty that you would also be watching the > > > current meter for the power supply feeding the 43MSN, looking for > > > minimum current at the same time as watching for max RF power out. > > > > Also true. > > > > > > > I've never found either the LLT or the MSN motrans to be very > > > diffult to tune. (although the LLT requires being a little more > > > careful) Cetainly the MSN was a far better radio than the LLT. > > > > There are three versions of the LLT transmitters: > > > > U41LLT > > U51LLT > > U43LLT > > > > The U41LLT uses a pair of M9116 PA transistors if I remember > > correctly and put out 30 watts of power. > > > > The U51LLT uses four M9116 PA transistors = 50 watts output. > > > > The U43LLT is basically a U51LLT with a varactor tripler on the > > output = 30 watts output. > > > > > > > For tuning that can be a little tricky to do *CORRECTLY*, I > > > suggesting attempting to tune of the of following transmitters: > > > > > > 1. UHF GE-Mastr Pro > > > > The early or later model? > > > > > > > 2. UHF Motorola HT-200 > > > > Quite a dream to tune ... if you like frustration ... > > > Yahoo! Groups Links > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
