[VHFcontesting] Attenuation from polarity mismatch (Re: C6AFP SixMeter Beacon

[N1BUG]

In the real world over a free space path with typical amateur 
antennas I believe it is about 20 dB, perhaps (sometimes) more. That 
is the figure I used in writing software to calculate polarization 
mismatch signal loss on the EME path years ago.

Usually there is a great loss on terrestrial paths but I have seen 
some exceptions where reflections from terrain or large objects was 
involved. In extreme cases, signals can actually be better with 
cross polarization! The owner of a 2 meter repeater (before my 
enlightenment) 70 miles away thought I was crazy when I told him I 
could hit it with horizontal polarization but not vertical. That 
situation was consistent. The antennas (yagis) shared a common boom 
so they were not in different locations.

73,
Paul N1BUG



On 01/29/2017 01:30 PM, w5prchuck at gmail.com wrote:
> The answer is: “It depends.”  In a perfect world, no power would be transferred.  The number I see most often for the real world is 20db.
>
> Chuck W5PR