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Re: RF Chokes + Bypass caps = resonant rise?
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Friday, November 21, 1997 6:40 PM
To: Tesla List
Subject: Re: RF Chokes + Bypass caps = resonant rise?
Hi Adam,
> From: Adam[SMTP:absmith-at-tiac-dot-net]
> Sent: Thursday, November 20, 1997 1:10 AM
> To: tesla list
> Subject: RF Chokes + Bypass caps = resonant rise?
>
>
> I just thought of something kind of disturbing. It occured to me that
> the 2mH RF chokes I borrowed from my small coil setup, in combination
> with my 500pF bypass caps, should have a cutoff freq. of 160kHz. Now, my
> current larger coil with it's big toroid operates at almost exactly
> 160kHz, so this is really bad- especially dangerous with no damping DC
> resistance. I suspect that these small chokes are actually working
> against me in this new setup! I am removing the chokes, and I will
> probably try to replace them with 10mH values or bigger, so that any kick
> back from the tank is dropped across the choke, not across the bypass
> caps!
>
> Any thoughts? Am I correct to do this?
>
> -Adam
Yes - go bigger and usethe smallest wire you can get away with for
max choke current (contributes to killing their Q).
Malcolm