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@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
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