[CQ-Contest] Reciprocity in signal strength

[K9MA]

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 at 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 at sdellington.us