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Re: Topband: 160 GP Choke

To: topband@contesting.com
Subject: Re: Topband: 160 GP Choke
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 06 Oct 2014 01:29:47 -0700
List-post: <topband@contesting.com">mailto:topband@contesting.com>
On Fri,10/3/2014 12:58 AM, Mike Waters wrote:
That is the design that I was originally going to use, except that I would
change it slightly because I use all 75 ohm coax. Anyway, what is the
advantage over one made with coax? Better bandwidth, I suppose?

Yes, the advantages of THHN are better bandwidth, and a closer Zo match to a high dipole. Jerry Sevick wrote about Zo of parallel wire line chokes, and had established the Zo values I noted. Many years later, I wound some chokes and confirmed these values within the range of experimental error.

73, Jim K9YC
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