I'm planning another amplifier (2 x 4-400A, 1.8-28 mHz) and I was thinking that
I would
deal with the "RF choke problem" by having two chokes in series. The one
nearest the
plates will have enough inductance for 20-15-10 meters with no series
resonances below 30
mHz. The second will be 1 or 2 mh to provide enough inductance for the 1.8-7
mHz bands. I
will use a vacuum relay to connect a bypass capacitor from the junction of the
two chokes
to ground on the high bands. Of course there will be further bypassing at the
cold end of
the big choke.
That way, both chokes will always be in the circuit to help keep RF out of the
power
supply but the resonances and distributed capacity of the large one won't upset
the higher
bands.
Is this a good idea or am I missing something?
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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