[Amps] RF choke switching

[Angel Vilaseca]

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?
>