[amsat-bb] Re: Please help me design a polarity switcher...
Nigel Gunn G8IFF/W8IFF
nigel at ngunn.net
Wed Nov 4 05:54:37 PST 2009
For VHF/UHF you need proper good quality co-ax relays.
They're not cheap and those available surplus are often 28/48/110V coils.
Elan Portnoy wrote:
> 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
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Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937 825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel at ngunn.net www http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP Club International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC, GCARES, XWARN.
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