B's lower antenna, on receive, should have less gain at the vertical
arrival angle of the 2 hop signal, so I think it all cancels out. That's
not to say other effect may not cause non-reciprocity.
73,
Scott K9MA
On 1/25/2023 3:23 PM, Richard Smith wrote:
Can something also be said for take-off angles?
Using a higher antenna, the transmission from station A might arrive at station
B in one hop. If station B has a much lower antenna, the transmission from B to
A might arrive in two hops. I believe each hop loses 10 to 20 dB. If both
stations use the same transmitting power, I believe A will be stronger at B
than B will be at A.
73, Rich, N6KT
On Wednesday, January 25, 2023 at 12:16:39 PM PST, Bill
N6MW<billsstuffn6mw@comcast.net> wrote:
Due to the earth's magnetic field there are just O and X modes and
neither obeys reciprocity except for special cases. Also the X mode
generally has more absorption loss, and further what you hear depends on
the antenna polarization and the sum of the O and X signals you receive
by different paths. It's a long story.
Of course local noise is probably still the biggie.
Bill N6MW
--
Scott K9MA
k9ma@sdellington.us
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