On Sun, 2 Sep 2001 "Tim Makins, EI8IC" <email@example.com> writes:
> I feel the topic of horizontal loops should be expanded on here.
> They seem a cheap and easy-to-construct antenna, which can be
> supported from 3 or 4 wooden poles, 20-30' high, in the corners
> of a small lot. The wire can be of a small gauge, and hence almost
> invisible, as long as you don't mind repairing it after occasional
> ice or bird-strikes. I have heard of one Scottish station using two
> one above the other, on the same poles, and claiming very good results
> QRP to VK-land.
> Who else has actually used a horizontal loop on the low bands, and
> what are your comments ?
> Tim www.qsl.net/ei8ic/
Sorry to disagree Tim, but a LOW horizontal 1WL loop is not my
idea of a good DX antenna. It IS a good high angle radiator for
local coverage. On harmonic frequencies, each side behaves
as a phased array of dipoles or long wires, depending on how
the sides compare to one wavelength at the frequency of interest.
A 2WL square loop (1/2 WL on each side), fed on the center of
one side, is an interesting antenna. It acts as two pairs of half wave
dipoles spaced 1/2 WL and fed out of phase. Each pair of opposite
half waves gives a bi-directional figure 8 pattern resulting in a nearly
omni-directional horizontally polarized pattern for the square loop.
If mounted at 1/2 WL high it is an effective and useful antenna.
At 20 or 30 ft on 80 or 40M, it SUCKS compared with a higher
dipole or good vertical.
Regarding wire size, anything smaller than #18 copper based wire
is subject to breaking readily from falling limbs or ice loading.
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 96 feet for under $1500!! http://www.anwireless.com
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Administrative requests: towertalk-REQUEST@contesting.com