[Amps] This Month's QST Article

[Steve Thompson]

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