I buy used TPL amps on Ebay. I've actually bought many of them. the
50W "mobile" amp does well if you don't push it hard and put plenty of
fan on the heatsink. The prices are usually quite good, and the vast
majority of the time, so are the amplifiers. If memory serves, there
is a 1-4W in 25-50W out one that would work well here if you can kick
the Hamtronics PA back to around 2.5-3W
On Aug 20, 2008, at 8:58 AM, Ian Miller wrote:
Hello.
Our club has a Hamtronics UHF repeater with the optional PA enclosed.
It puts out a whopping 7 watts to a dummy load.
Antenna is a Sinclair 8 dipole array.
The repeater has been moved to a site 25 miles north of where it
was. Although it hears well, it could use a little more oomph on
transmit.
I have at home what looks like a UHF PA from a Mastr 2. Goldish
color, main transistor is a MRF646. Feeding in about 5 watts from an
HT only got me 15 watts into the dummy load.
I scoured the net looking for a simple UHF Class C design that I
could transplant that 646 into. I cant even find the old Motorola
data sheets that gave a test circuit.
Is any company making a reasonably priced UHF PA? Or can someone
forward me a circuit or a link to a circuit that I can try?
Thanks in advance.
Ian
VA2IR
VE2RMP repeater group
--
Cort Buffington
H: +1-785-838-3034
M: +1-785-865-7206
