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Re: Topband: 2 wire beverage question

To: Tom W8JI <w8ji@w8ji.com>
Subject: Re: Topband: 2 wire beverage question
From: Grant Saviers <grants2@pacbell.net>
Date: Wed, 28 Nov 2012 09:18:49 -0800
List-post: <topband@contesting.com">mailto:topband@contesting.com>
Is there any performance difference between a two wire open wire bidirectional Beverage and the bidirectional coaxial cable design also in ON4UN's book?

Grant KZ1W


On 11/28/2012 7:49 AM, Tom W8JI wrote:
ON4UN states in his book that the wires for a 2 wire reversible beverage must be installed side by side, but also may be placed one above the other with satisfactory results.
Did someone try this? How satisfactory is satisfactory?

There is no difference at all.

If the feed system is right, and the line is properly constructed, it would all work virtually the same. It does not matter if one wire is above the other, or if they are side-by-side.

Absolutely the best construction method would be a twisted or transposed line, twisted or transposed at fractions of a wavelength, but even using the best twisted or transposed installation it would be difficult to tell from an untwisted line if the conductor was very close spaced (a few inches or less).

What does make a difference is the wire used, and how the line behaves as a transmission line. I would not use telephone, insulated wire twisted pair, or field phone wire, because they are very poor transmission lines that are lossy and heavily affected by water.

The wire layout of good line, however, is meaningless (except for transposing or twisting which can help maintain balance).
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