[Amps] one way coupler

Vic Rosenthal vic at rakefet.com
Sat Jan 31 14:07:49 EST 2004


Steve wrote:

> I tried running two smaller (HF1250) amps each feeding one element of a
> phased vertical. One amp receives a lot of reflected power from the
> other element. I would like to know if there is a circuit to stop
> reflected power but allow the forward power ?

How do you control the phase relationship between the elements with this 
setup?  Wouldn't slight differences in tuning of the tank circuits of 
the amplifiers result in phase differences?

I think the way to eliminate the 'reflected' power (which is really a 
result of the parasitic current (as in 'parasitic array', not 'parasitic 
oscillation'!) in the element would just be to insert a matching network 
in the line or at the base of the tower(s).  Then you could adjust it 
(them?) for zero reflected power.  I don't know what this means for the 
phase and current relationships in the elements, though.  Wow, the idea 
of trying to make this work makes my head spin.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco




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