[Amps] plate bypass caps

[Alex Eban]

...OK guys! Just please remember: the RF current at the choke's base can be
quite high, so RF withstanding current must be quite high! 
Apart from that, it's better to use different kinds of capacitor in
parallel, rather than one alone, except if it is made especially for high
current duty: one value in the tens of nanofarads for the very low
frequencies, one or two ceramic units for the higher frequencies. I measured
RF currents in the Ampere range on a 1200W PEP amplifier.
Alex	4Z5KS

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Russ Williams
Sent: Monday, January 12, 2009 7:06 PM
To: Jim W7RY; amps at contesting.com; k7fm
Subject: Re: [Amps] plate bypass caps

Ooops; I mis-read as blocking caps.  Oh well.  Yes, they will be fine at the
base of the plate choke; I use similar caps in my projects but use good
doorknobs for blocking caps.  

Thanks.

Russ


--- On Mon, 1/12/09, k7fm <k7fm at teleport.com> wrote:

> From: k7fm <k7fm at teleport.com>
> Subject: Re: [Amps] plate bypass caps
> To: "Jim W7RY" <w7ry at arrl.net>, hrd998cc at yahoo.com, amps at contesting.com
> Date: Monday, January 12, 2009, 6:06 AM
> :There is no RF current (or very little) to speak of at the
> BASE (cold RF end) of the plate choke."
> 
> And, two in parallel handle twice as much rf current as
> one, in any event.
> 
> 73,  Colin  K7FM


      
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