The electron gyrofrequency (1.6 MHz or less) causes 160 meter signals
propagating more-or-less east-west at mid-latitudes to strongly favor
vertical polarization.
80 meter propagation only slightly favors vertical polarization for
more-or-less east-west propagation at mid-latitudes. Other factors
such as ground reflection efficiency in the Fresnel zone are much more
significant.
The gyrofrequency doesn't affect horizontal or vertically polarized
signals at 7 MHz and abovc.
73
Frank
W3LPL
----- Original Message -----
From: "K4SAV" <RadioXX@charter.net>
To: topband@contesting.com
Sent: Friday, December 11, 2020 10:17:39 PM
Subject: Re: Topband: Low Dipoles
Saying 160 propagation is complicated is an understatement. Otherwise
someone would have already figured this stuff out. One other
contributor that has to be added to the mix is the effect of Earth's
electron gyrofrequency,. NEC knows nothing about this effect. It's
also a function of where on this planet you live Some people get the
benefit, other don't. Antenna polarization is important when
interacting with the effects of Earth's gyrofrequency,.
Jerry, K4SAV
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