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.
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). 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. 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. ------ Original Message ------ Received: Tue, 04 Jan 2005 04:45:08 PM CST From: Neil McKie <[EMAIL PROTECTED]> To: Repeater-Builder@yahoogroups.com 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 <*> 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/