at XZ0A the situation was a bit different - high in the solar cycle so the polar oval was in the way for
a lot of paths. The signals we could hear in the first couple of hours at sunset arrived out of some
kind of duct and were dumped down on us at a high angle. We could not hear anything on the beverages (
not very good ones, BOGs on uneven paths- beverages never the less) or the TX quarter wave until way
past dark by a couple of hours. Our signal arrived into the eastern US from the southwest
so, that dipole accounted for a lot of contacts. I am not sure I can put a signal ratio number on it,
but its got to be more than 10 dB as it was hear and copy signals versus hear nothing
RX noise level was not zero even though we were on an island that had diesel generator power - we could
hear the typical buzz from shore several miles away at noon- common in Asia. at night the propagated
sum of zillions of Asia power leaks was not trivial. the dipole helped with that as it did not hear the
lower angle noise sources
Robin
----- Original Message -----
From: <sawyered@earthlink.net>
To: <topband@contesting.com>
Sent: Tuesday, December 15, 2020 10:03
Subject: Re: Topband: Low Dipoles
I have a "really low" NVIS dipole that is at 40ft elevation - ends at 20 ft.
I put it up for very local communication and to experiment with DX angles.
I have only found it to be "okay" at sunset to maybe 30 - 45 mins after,
where, at times, its equal to my 2 el T top phased array to EU. Its NEVER
stronger to EU that I have seen so far.
I have observed it being 10db stronger during that same period than my omni
directional T vertical to stations about 500 miles out. But within an hour,
it loses out to the vertical.
73
Ed N1UR
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|