[TowerTalk] Takeoff Angles and Non-Reciprocal Propagation

[David Gilbert]

Hi, Rick.

I stand corrected on directional couplers versus circulators.  Thanks.

No, I'm not implying that transformers are non-symmetrical.  It simply 
occurred to me that my suggestion for what might be happening to signals 
over asymmetric terrain might be similar to what happens with a 
circulator, where energy going in one direction takes one path while 
energy coming back takes another, keeping in mind I'm only talking about 
the portion of the path between the originating station and the 
significant terrain in front of it.

I'll find a big rock and sacrifice a 3-500Z (with a shorted grid) on it 
to persuade the radio gods to grant N6BV a terrific Sweepstakes if it 
makes him willing to provide his expert thoughts on this subject ... 
even if he just tells me I'm full of crap.

Dave   AB7E



Richard (Rick) Karlquist wrote:
> What you described is a circulator:
>
> http://www.microwaves101.com/encyclopedia/circulators.cfm
>
>
> You can build a directional coupler out of transformers
> as shown in:
>
> http://michaelgellis.tripod.com/direct.html
>
> You aren't implying transformers are non-reciprocal?
>
>
>
> David Gilbert wrote:
>   
>> Unless I'm using the term incorrectly (certainly a possibility), a 
>> directional coupler routes signals leaving Port A to Port B, whereas 
>> signals leaving Port B in the reverse direction end up at Port C ... not 
>> Port A.  As far as Ports A and B are concerned, I don't think we have 
>> reciprocity.
>>     
>
>   
>> By the way, I've tried to contact N6BV to see what his take on all of 
>>     
> ugh to hear from him.
>
> N6BV is extremely busy getting ready to help NCCC win the Sweepstakes
> gavel again.  Which reminds me, I have to duck out of this thread
> and get ready for SS myself.
>
> Rick N6RK
>
>
>
>   
>> Dave   AB7E
>>     
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