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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