[TowerTalk] Guy Wire Affect On Beams

[Guy Olinger, K2AV]

----- Original Message -----
From: <n4kg@juno.com>

> His guys were broken up with insulators, but the first
> insulator was placed 10 ft from the tower, several feet
> below the antenna.

Guys near antennas should be insulated from the tower at the tower
(within a foot or so).

In the situation you mention, the 10 feet connects to the tower. So it
is a LONG conductor with a bent portion (the 10 feet) closely coupling
the antenna. The ten feet probably does not figure in its resonance,
since the conductor is it, the rest of the tower, and whatever else is
connected or closely coupled to it, most likely a hodge-podge of
miscellaneous resonances. It may distort the main pattern somewhat, may
change SWR, but certainly on receive PICK-UP a lot of unwanted noise and
off-direction signals, otherwise eliminated by the antenna.

It will also couple transmitted signals back into other conductors
heading for the shack.

It will in effect reintroduce all the problems for which they probably
placed a balun at the antenna feedpoint.

- - . . .   . . . - -     .   . . .     - - .   . - . .

73, Guy
k2av@contesting.com
Apex, NC, USA

>


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