Topband: Comments on High Performance RX Antennas for a Small Lot (Webinar)

Don Kirk wd8dsb at
Fri Mar 4 01:57:26 EST 2016

Hi Rick,

I would also think that peak radiation angle of the RX antenna versus the
arrival angle of the desired signal is also a big variable that would not
allow the relationship you heard on the webinar to be true under all
conditions.  As you said it probably is too much of a generalized
statement, and needs some very specific conditions to be true.

I know with my RX antennas the improvement in signal to noise compared with
my TX vertical is very dependent on arrival angle (as an example).

P.S I did not hear the webinar.

Don (wd8dsb)

On Friday, March 4, 2016, Richard (Rick) Karlquist <richard at
<javascript:_e(%7B%7D,'cvml','richard at');>> wrote:

> In this webinar, it was asserted (without explanation) that
> for every 1 dB increase in RDF, you get 1.5 to 2.0 dB
> improvement in S/N ratio.  I've never heard that before
> and don't even see how it makes sense.  Actually, I don't
> even know how you can make generalizations like that
> unless you are describing a theoretical QTH with uniform
> isotropic noise.  I'd like to believe this is true.
> Can someone educate me as to why I should believe this?
> Rick N6RK
> _________________
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