[amsat-bb] Re: Please help me design a polarity switcher...

David Wing david at cdwing.com
Tue Nov 3 22:43:15 PST 2009

Try this


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Elan Portnoy
Sent: Tuesday, November 03, 2009 9:25 PM
To: amsat-bb at amsat.org
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?

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