I haven't seen QST but have built some 1kW amps using the current
crop of LDMOS transistors - several for 144MHz, 50odd for 200MHz
pulsed applications.
27dB gain - yes, that's what you get. I haven't seen the >70%
efficiency figures others have reported.
There's lots of examples out there, look up F1JRD, F1TE, W6PQL to
name a few off the top of my head.
F1JRD tested an amp with 10ms pulses into all phases of very high
VSWR and it survived, so if you use a SWR trip that acts faster
than that an amp should survive mishaps at the output.
Steve
Have any of you read the solid state 2-meter amplifier article in QST this
month?
New solid state device.
75% efficiency. Also, 27 db gain. Are these claims true?
Seems to be a good device at a reported cost of $270 dollars.
Lee - K0WA
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