----- Original Message ----- From: "Elan Portnoy" elanportnoy@yahoo.com To: amsat-bb@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?
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