[amsat-bb] Re: Remote polarity / preamp switching
domenico.i8cvs at tin.it
Sat Dec 3 16:58:07 PST 2011
----- Original Message -----
From: "Dominic Hawken" <dominic at del.co.uk>
To: <amsat-bb at amsat.org>
Sent: Sunday, December 04, 2011 12:54 AM
Subject: [amsat-bb] Remote polarity / preamp switching
I currently have two runs of coax from the shack up to the roof, each
connected to smallish dual band 2/70 yagis, horizontally polarised, on an
az/el rotator. One's connected to the 70cm output of my FT847, and the other
to the 2m output.
> I'd like to upgrade to cross-polarised beams for 2 and 70 that I can
switch between vertical, horizontal and circular polarisation, and also add
masthead preamps powered through the coax. Some form of remote switching
seems to be the way to go, but the few commercial switches I've found
googling are really expensive (and I'd need two afaik).
I'm basically wanting to upgrade without having to run more coax or power
cable up to the mast if possible - wondering of anyone has done something
similar without breaking the bank.
> Thanks in advance tor any help,
> Dominic G6NQO.
Hi Dominic, G6NQO
Your project is a difficult task on time and money.
BTW in a separate email to you I have attached my articles
"Switching Four Polarizations on a 70 cm crossed yagi"
publisced into the AMSAT Journal March/April 2007 first
part, and May/June 2007 the second part.
More information about the AMSAT-BB