[amsat-bb] Re: Please help me design a polarity switcher...
domenico.i8cvs at tin.it
Wed Nov 4 08:27:38 PST 2009
----- Original Message -----
From: "Elan Portnoy" <elanportnoy at yahoo.com>
To: <amsat-bb at amsat.org>
Sent: Wednesday, November 04, 2009 6:24 AM
Subject: [amsat-bb] Please help me design a polarity switcher...
> I have both vertical and horizontal elements of my 70cm yagi coming into
the shack via separate runs of LM400. They meet in a box with bits of coax
for matching and phasing before going to the radio.
> I would like to add a relay to make polarity changes quick and easy. Do I
need to use a specific type of relay or will a garden variety DPDT from
Radio Shack be sufficient?
> Elan WB2IOL
Hi Elan, WB2IOL
Read please the article " Switching Four Polarizations on a 70 cm Crossed
Part-1 AMSAT-Journal March/April 2007
Part-2 AMSAT-Journal May/June 2007
In a separate email I have sent to you a pdf file for both articles.
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