----- Original Message ----- From: "Elan Portnoy" <[email protected]> To: <[email protected]> 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? > > Thanks, > Elan WB2IOL Hi Elan, WB2IOL Read please the article " Switching Four Polarizations on a 70 cm Crossed Yagi " 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. 73" de i8CVS Domenico _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
