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Re: [Amps] More parasitic choke questions

To: <amps@contesting.com>
Subject: Re: [Amps] More parasitic choke questions
From: "Bill, W6WRT" <dezrat1242@yahoo.com>
Reply-to: dezrat1242@yahoo.com
Date: Thu, 29 Jul 2010 15:31:58 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
ORIGINAL MESSAGE:

On Thu, 29 Jul 2010 16:27:58 -0400, "Carl" <km1h@jeremy.mv.com> wrote:

>I dont understand how moving the resonant frequency of the coil up and using 
>the same resistor raises the Q?

REPLY:

If you are talking about the suppressor coil, it is not resonant and
has little effect on the VHF parasitic frequency because it is
bypassed by a low value resistor. Its purpose is to provide a
low-impedance path for the HF current around the resistor. 

If one did not care about bypassing the HF around the resistor, one
could have only the resistor without a coil at all and the parasitic
suppression would be equally effective. Power loss would be high of
course, but it would work. I have never seen it done that way and I
mention it only to help folks understand what the purpose of the coil
is. I am not recommending it. 

73, Bill W6WRT
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