Topband: New guy here. Low noise rx antenna for 1/2 acre lot?
Rick Karlquist
richard at karlquist.com
Wed Jan 4 14:25:28 EST 2006
K9AY wrote:
>> As W8JI and others have pointed out often -- antennas can only lower the
> noise through directivity. "Omnidirectional" and "lower noise" are
> mutually
> exclusive!
Generally true, but on the other hand, I frequently can hear as
well or almost as well on 160m using a 40m inverted vee (basically
omnidirectional) compared to a VERY directional Beverage. I am
assuming this is a polarization phenomenon. BTW, this is not
a "lucky" inverted vee. Other inverted vees at different heights,
orientations, locations, etc are nearly indistinguishable from this one.
Also, I can put up a simple loop, again basically omnidirectional,
and orient it in a certain direction and null out power line
noise. I can move this loop 1/4 mile and still null out power
line noise, so again, it is not a "lucky" loop or a "lucky"
location (which is not to say those don't exist).
Last weekend I was listening to JA's on 160m on a 20 foot high
80 meter dipole. Again basically omnidirectional, but it was
close to the beverage in performance, at least that day for those
stations.
Rick N6RK
More information about the Topband
mailing list