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Re: [TenTec] 4229 Tuner Balun Replacement?

To: tentec@contesting.com
Subject: Re: [TenTec] 4229 Tuner Balun Replacement?
From: Jim Brown <k9yc@audiosystemsgroup.com>
Reply-to: k9yc@arrl.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 14 Nov 2010 17:04:06 -0800
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On 11/14/2010 4:22 PM, Dr. Gerald N. Johnson wrote:
>> There are two causes of feedline radiation/reception -- common mode
>> >  current and conductor spacing. A common mode choke AT THE FEEDPOINT can
>> >  essentially kill the radiation due to common mode current unless the
>> >  feedline is some multiple of a half wave, in which case an additional
>> >  choke placed along the line to act as an "egg insulator" to make it less
>> >  than a half wave would kill the remaining current.
> Or if the feed line isn't perpendicular to the radiator and so gets
> coupled to the radiator beyond the choke.

That's the function of the additional choke as egg insulator -- to break 
the feedline into lengths (from a common mode point of view) where very 
little current can flow.

73, Jim K9YC
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