Thanks John,
"I think" I can "almost duplicate the Quadra RF deck. I'd use a
different power supply. Maybe a couple of those from the telcos. The
gates would likely require 1 ohm resistors. 8 of those will put out 2400
Watts, so a little NFB to let them run 1500 to 2 KW should make for a
rugged and linear, no tune amp. I think I could get a LPF kit off E-bay
although I didn't find any anp parts from the ham in Israel.
73, Roger (K8RI)
On 5/3/2017 3:34 AM, John Lyles wrote:
The MRF151G is a push pull 'gemini' packaged part. MACOM sells their
equivalent on Mouser's website for about $105 in 10 piece qty. This
part has been around for decades and is very well known and used in
thousands of places. It is one example of a power RF semiconductor
that has market longevity like a tube. Recently at CERN, the
Swiss/French particle accelerator site, a new design of RF drivers was
developed around this part. They are modulator units that provide
about 1 kV of kick to the protons, and are driven by a cluster of
MRF151G's running in HF range. Radiation can kill semis, but the
MRF151G has pretty good lifetime and they have figured out a special
way to compensate for the bias shift in the parts. Plus, its cheap
enough just to throw the transistors away every year or so and replace
with new, in the big scheme of things.
I recommend designing around the 151G if you want a long time source
for parts. We use them in a number of solid state amplifiers where I
work too.
73
John
K5PRO
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