> > The RF power transistors are listed as "Factory Select".
> > Do you know what the mfgr and part no. is or what would work?
> > Thanks
> > Gene
> > WA2IJE
>
> Probably some Motorola MRF-xxx type equivalent. I'd probably use
> a Motorola RF Transistor Data Book to look for a matching power
> level and case style. I'd also need to know how many stages
> are in the amplifier...? ... direct drive of 2 output transistors
> or if there's a single or dual predriver stage before the
> final sections.
I have a new (well, it's been sitting on the shelf for a few years) TPL RXR
series 220 amp here. It uses an MRF-646 driving a pair of MRF-648's. This
is the same configuration as used in their UHF amps that take 8-15 watts in
for 70-100 watts out (though obviously with different component values and
microstrip Z/geometry). Obviously, at the lower frequency, the gain is
higher - this one is labeled 5 in for 100 out.
--- Jeff
--------------------------------------------
Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant
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