W2RU - Bud Hippisley wrote:
3. I operate 99% CW, and have added a 25 - 28 volt (50 watt!) Zener in
series with the stock 5.1 volt operating bias Zener when I am on CW. I
originally did this because I run full break-in on CW, and use an electronic
TR switch on the output of the amplifier, so I needed to cut off all plate
current to eliminate "hash" in the receiver. Secondary benefits of this are
that I have no power dissipated in key-up idling current and my key-down
efficiency is probably slightly higher than it would be with the stock class
B biasing.
I am also primarily a CW operator and would be interested in hearing about any
others who have optimized amplifiers for CW. I've always felt that it's a shame
to waste power by biasing CW amplifiers for minimum IMD!
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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