[Amps] RF choke switching
Angel Vilaseca
avilaseca at bluewin.ch
Thu Jun 9 23:12:29 PDT 2011
Vic,
Why not use the vacuum relay to short the big choke? That is what is
done on the tank circuit when bandswitchig.
73 de HB9SLV
Vic K2VCO a écrit :
> 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?
>
More information about the Amps
mailing list