[Amps] This Month's QST Article

[Carl]

The QST article is what has been on W6PQL's web site for months, maybe 
cleaned up a bit for the masses.

Carl
KM1H

----- Original Message ----- 
From: "Steve Thompson" <g8gsq72 at gmail.com>
To: <amps at contesting.com>
Sent: Wednesday, September 26, 2012 3:19 AM
Subject: Re: [Amps] This Month's QST Article


>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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