[amsat-bb] Re: Remote polarity / preamp switching

Dominic Hawken dominic at del.co.uk
Sun Dec 4 01:42:16 PST 2011

On 4 Dec 2011, at 00:58, "i8cvs" <domenico.i8cvs at tin.it> wrote:

> ----- 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.
> 73" de
> i8CVS Domenico

Thank you Domenico - much appreciated.


Dominic G6NQO

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