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Re: [TowerTalk] Fair rite materials for choke baluns

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fair rite materials for choke baluns
From: jimlux <jimlux@earthlink.net>
Date: Tue, 5 Jul 2016 10:42:34 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 7/5/16 9:23 AM, Jim Brown wrote:
On Tue,7/5/2016 7:34 AM, Jim Thomson wrote:
IF your sloping  half wave dipole is  UN balanced...then why insert a
CMC  at the feed point at all ??
I would dump the CMC at the feedpoint, then perhaps  use a CMC  way
downstream , like just
before the coax meets the tower..or at the base of the tower..or both.

Nope! The first choke should ALWAYS be at the feedpoint. Additional
chokes farther down the line can be used to prevent current induced on
the feedline from causing grief in the shack (like with your rack full
of un-necessary audio processing gear). :)


I can conceive of situations where putting the choke somewhere down the line might be ok or desirable (from a mechanical standpoint). Maybe not realistic or practical situations. But if you had a 40 m sloping dipole that's 20 m long, and your choke were at, say, 2 meters, and the coax from dipole to choke were at right angles to the antenna, I think it would work just about as well.



On the other hand, and getting to the "practical" aspect putting it at he feedpoint, the mass is better supported by the antenna itself.

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