[TowerTalk] Takeoff Angles and Non-Reciprocal Propagation

[Steve Maki]

David Gilbert wrote:

> You say that non-reciprocal propagation (recognizing that neither of us 
> is referring to the ionosphere here) is impossible even taking into 
> account diffraction.  If diffraction happens to cause energy to take a 
> different path in the return direction than it took in the outgoing 
> direction, why is non-reciprocal propagation not possible?  Please 
> explain without simply saying it is impossible.


Dave,

It seems to me that when you model station B (located at ground level 
and fairly close to the hill) coming back at you, you are not producing 
diffraction info that's relevant to a skywave coming back from a DX 
station, which is hitting that hill from a completely different angle.

Steve K8LX