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Long
Beverages overrated
By Tom Rauch, W8JI
Topband Antenna mail list, October
14, 2000
I have reservations about using multiple-wavelength-long Beverages.
First, the loss in the antenna limits the directivity increase
as it is made longer. That won't hurt much, but what it does mean
is you often won't get the sharp pattern you expect. The extra wire
may not be worth it.
Second, I've found that with distances as small as two wavelengths
or more...the signal is almost never in a stable phase relationship
at both places at the same time. This means the signal will have
random phase and amplitude differences and not "add" properly in
the wire.
I used to think the first reason was why I was always disappointed
when comparing long Beverages (over 2wl) to shorter Beverages, but
after playing with antennas spread over a large area I find that
a signal often has different fading times on an identical antenna
just 1000 feet away on 160 meters!
Now I believe that effect is a big player in why I never saw a significant
improvement with long Beverages compared to 1 wl antennas. |
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