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 ...
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