Topband: Low Dipoles

[donovanf at erols.com]

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 at charter.net> 
To: topband at 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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