From: Bill Turner <dezrat@outlook.com>
To: Amps group <amps@contesting.com>
Subject: Re: [Amps] Choke anomoly
>Any comments would be greatly appreciated.
>
>Jim VE7RF
<REPLY
<You don't need a choke at all, at least for SSB or CW. A choke is a
<constant-current device, exactly wrong for SSB and CW. Just bypass it
<and be sure you have at least 35 uF of capacitance. Your SSB or CW
<amps needs a constant voltage source, not constant current.
<73, Bill W6WRT
## Bill this is for a C – L – C filter. The software depicts superb
dynamic
regulation, with or without the choke. The addition of the choke just kills
the
ripple to an extreme low value. I can shunt the choke with a spst 25 kv
ceramic vac relay. Then it becomes a C-C network... IOW 2 x filter caps
in parallel. I used the stepped load feature of PSUD..and toggled between
normal idle current..and full bore plate current ( asap, instantaneous load
switch),
then compared the C – L – C vs the C-C.
## heres what does not work, a C-L or C-C-L. In those cases, the choke
provides zero ripple reduction, none.
## What else that does work is a C-R-C filter. Not as good as a choke,
but extremely
effective. Again, what does not work is a C-R or C-C-R filter, no
improvement in ripple.
Jim VE7RF
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