[amsat-bb] Re: accidental RF into wrong cable of Arrow=bad duplexer?
elanportnoy at yahoo.com
Sun Oct 11 14:28:43 PDT 2009
Duplexer are bi-directional. Essentially passive bandpass filters--don't care which way he RF flows.
--- On Sun, 10/11/09, Tim Goodrich <tim at timgoodrich.net> wrote:
> From: Tim Goodrich <tim at timgoodrich.net>
> Subject: [amsat-bb] accidental RF into wrong cable of Arrow=bad duplexer?
> To: amsat-bb at amsat.org
> Date: Sunday, October 11, 2009, 3:51 PM
> I am an owner of a 2m/70cm LEO
> satellite antenna with duplexer in the
> handle. Sometimes, I operate full duplex (two radios) and
> bypass the
> duplexer by attaching my own cables to the separate parts
> of the antenna (1
> radio for 2m, 1 radio for 70cm). In the course of rushing
> to catch a
> satellite pass, I mixed up my connections and accidentally
> transmitted (5
> watts) into one of the arrow antenna cables, causing RF to
> feed backwards
> into the duplexer.
> Recently, I have noticed decreased performance (poor
> reception, lower S/N,
> even on AO-51 when in the past it was full quieting) and am
> trying to
> ascertain if it could have anything to do with my mistake
> of feeding RF in
> the wrong direction into the duplexer. Could my mistake
> cause this problem?
> Sent via AMSAT-BB at amsat.org.
> Opinions expressed are those of the author.
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