Topband: one-way propagation

[ZR]

It just goes to show that what looks good on paper in theory does not mean 
it HAS to be the same in the real world.
There is nothing to prevent 2 signals a continent away and with different 
antennas from taking completely different paths when one is at either sunset 
or sunrise.

There hasnt been a book written yet to explain it all.

On a different note there was no way anyone would have believed that it was 
possible to work JA on 6M at the bottom of the cycle from New England yet 
several of us made the trip starting a few years ago. Experts are still 
arguing about that mechanism while on here one stands on a platform (not you 
Carl) and expects everything said to be believed without question.

Carl
KM1H


----- Original Message ----- 
From: "Carl Clawson" <clawsoncw at gmail.com>
To: "topband" <topband at contesting.com>
Sent: Tuesday, December 04, 2012 6:22 PM
Subject: Re: Topband: one-way propagation


> Yes, a good point that I neglected. This entirely circumvents my 
> yammerings
> about reciprocity. Reciprocity is a characteristic of a single pair of
> ports in a network. Introducing separate receive antennas can surely cause
> a one way effect. Consider what happens when I hook up a dummy load as a 
> Rx
> antenna ...
>
> 73 and thanks for listening,
> Carl WS7L
>
>
> I've often thought that some "one-way propagation" is simply due to the
>> differences in antennas. For example, two stations with the same power,
>> ambient noise level, etc. are receiving on Beverages pointed at each 
>> other,
>> but their TX antennas have different takeoff angles and/or patterns.
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