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Re: [Amps] HV feed through capacitor

To: Carl <>
Subject: Re: [Amps] HV feed through capacitor
From: Larry <>
Date: Fri, 10 Feb 2012 12:34:54 -0800
List-post: <">>

Yeah, it's for a 432 amp. At that frequency the series inductance of a 
single "normal" disc ceramic is enough to prevent good bypass action. 
Results in a lot more 432 energy running around on the HV line than I like.

YU1AW calls for a cap made from FR4 PCB material. Even though I etched 
back the edges and hi-potted the thing, it still managed to prove that 
my HV supply fault mitigation system actually works!

I have some 270 pF/6KV discs that I've been playing with. By cutting off 
the leads and soldering directly to short pieces of 3/8 inch wide copper 
strap and using several in parallel, the network analyzer suggests that 
it might work. I will try that if no reasonable feed through cap shows up.

Thanks to all those that responded with vendors. Nothing seen so far 
looks suitable for my purpose. BTW, Surplus Sales is #1 on my list of 
"never again" vendors.

73, Larry - W7IUV

On 10-Feb-12 12:04 PM, Carl wrote:
> Any reason you cant use a ceramic feedthru and a disc cap for bypass?
> Works for me at the 1500W level thru 222 MHz.
> Carl
> KM1H
> ----- Original Message ----- From: "Larry" <>
> To: "AMPS" <>
> Sent: Friday, February 10, 2012 12:25 PM
> Subject: [Amps] HV feed through capacitor
>> Can anyone suggest a source of high voltage feed through capacitors. I
>> need 5 KV minimum and 270 pF to 1000 pF. Any leads to a supplier would
>> be appreciated.
>> Thanks & 73,
>> Larry - W7IUV
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