RE: [TowerTalk] one way coupler

[Jim Lux <jimlux@earthlink.net>]

At 10:28 AM 1/30/2004 -0500, Kevin Adam wrote:
> Yes Comtek Phase Box will do just what u want it to do
> www.comteksystems.com
> just proud owner of two for 160m 80m


I'd kind of want to see some analysis or measurements that shows that the 
Comtek device will do what Steve needs.  He's running two amplifiers, one 
to each antenna.  The Comtek is similar to a variety of hybrid couplers, 
and is narrow band (which, in Steve's application probably isn't a 
problem). The Comtek (in my recollection) uses a "Collins bridge" type 
hybrid to create the quadrature outputs.  In any event, these devices are 
fairly run of the mill quadrature hybrids.

For narrow band applications (and where the phasing of the two elements is 
fixed relative to each other), one can design an LC network, or even, a 
fairly broadband transformer arrangement, that will dump the  power coming 
out of the element into a load (there's a multioctave hybrid in basically 
every telephone, for instance, to do the 4wire/2wire conversion).  I'm not 
a fiend on efficiency, per se, but it strikes me that this isn't what Steve 
really wants to do.


> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Lux
> Sent: Friday, January 30, 2004 10:02 AM
> To: Steve; towertalk@contesting.com
> Subject: Re: [TowerTalk] one way coupler
>
>
> ----- Original Message -----
> From: "Steve" <ve3tu@rac.ca>
>
>
> > 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 ?
> >
>
> Very interesting (since this is something I'm also working on doing)..

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