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Re: [RFI] Coaxial Choke

To: "RFI List" <rfi@contesting.com>
Subject: Re: [RFI] Coaxial Choke
From: "Andy" <ingraham.ma.ultranet@rcn.com>
Reply-to: Andy <ingraham.ma.ultranet@rcn.com>
Date: Wed, 15 Apr 2009 11:08:05 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
> The material in the ARRL Handbook is woefully out of date and quite
> inadequate.

I'm not sure if "out of date" is exactly right in this context (neither the
coax nor the theory changed, did they?), but I believe you are right that
air would coax chokes are inadequate for HF.  OK for VHF, maybe for the
upper HF bands too, but not as a general HF band choke.  Not nearly enough
impedance to choke off common-mode currents.

There was an email thread about this on one of the many other email lists I
subscribe to, saying pretty much the same thing.  To be effective at HF, one
must use some ferrite core(s) to make an effective choke.


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