Fw: RE: [Amps] RFConcepts Mini-Amp 144

[nospam4me at juno.com]

Ken,

A bias control circuit with temp tracking is in order. 
Examples have been detailed in past ARRL 
Handbook Projects and the famous Motorola 
RF Data Applications (notes). 

Cheers, 

Skipp

--------- Forwarded message ----------
From: KE2N at cs.com
I have a mirage 300 w brick with a similar biasing scheme. It had
terrible SSB linearity until it "warmed up". I increased the forward bias
so that it was clean cold, but now it goes into a kind of thermal runaway
when it gets hot (draws 40 amps contiuously - class A!). My cure was just
to put a really big fan on it so it does not get hot. A less-than-ideal
situation. A "real" bias circuit would certainly help. I don't think any
of the Mirage amps have them.
Ken


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