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Re: [TowerTalk] To get a truly balanced antenna feed

To: jimlux <jimlux@earthlink.net>, towertalk@contesting.com
Subject: Re: [TowerTalk] To get a truly balanced antenna feed
From: Steve Hunt <steve@karinya.net>
Date: Sat, 25 Jun 2016 16:57:59 +0100
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Some readers may be interested in measurements made on a "real world" antenna - a 100ft doublet centre-fed with window-line.

At the shack end of the window-line, the equivalent star-network impedances measured at 3.5MHz were:

Z1 - Window-line Leg 1 to Star Common: 15.1 - j79
Z2 - Window-line Leg 2 to Star Common: 1.6 - j109
Z3 - Star Common to Ground: 30.7 + j110

A perfectly balanced system would show Z1 = Z2
Z3 is related to the common-mode impedance of the system to ground.

Steve G3TXQ
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