[TowerTalk] Takeoff Angles and Non-Reciprocal Propagation

[David Gilbert]

Yes, the single ray (for the sake of argument) that travels from A to B 
is monochromatic, but it isn't infinitely thin in terms of it's 
interaction with surroundings.  That single "ray" is energy traveling 
with a spatial density (in terms of it's interaction with surroundings) 
that is a function of it's wavelength.  A "ray" passing within a 
wavelength or few of a physical feature is going to be influenced by 
that feature in a manner that is a function of its conductivity, 
dielectric constant, physical shape, and the incident angle.  My 
proposition is that since the shape of a feature (relative to a 
wavelength) as seen by the ray isn't necessarily the same going in both 
directions, the paths taken aren't necessarily the same.

Dave  AB7E



Jim Lux wrote:
>
> As far as propagation through the air/over edges goes, your radio signal 
> is monochromatic.
>
> And, it's only one ray that's propagating from here to there.  Yes, you 
> launch many rays, but most don't go to there.  So, it still does work.
>
> Multipath does occur, but each of the individual paths is reciprocal at 
> any given instant.  They just change relative to each other 
> (particularly on skywave) so you get frequency selective fading.
>
>
>   
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