This sounds the same, and I made it to protect the front end of each radio by switching the radio not being tested to my dummy load in case one of the radios should transmit. I intended my switch for receive comparisons. I am surprised the commercial switches can handle a kilowatt and provide adequate isolation. I wouldn't want to use that kind of power with the switch I made.
I didn't know about the switches you mention. I thought there should be a need for them, so I called MFJ. I like to protect my equipment. I know guys who don't think this way. Maybe MFJ didn't sell any and discontinued them. At the time, I thought they described them rather vaguely, missing the whole purpose. Maybe I haven't found them on their website now. Dick, n0ce On 1/2/2017 7:06 AM, Charlie T, K3ICH wrote: > Several companies (Bird, Transco) make what you describe. It is a four > terminal coax relay called a "Transfer Switch" that for example, connects > any two antennas to any two radios, but never at the same time. In other > words, radio A connects to antenna 1, and at the same time, radio B connects > to antenna 2. Activating the switch ( either mechanical or electrically > activated) changes the condition for A to 2 and B to 1. Most are good for a > kilowatt well up into the UHF ranges. For HF, I made one using a heavy > DPDT relay. > > 73 Charlie k3ICH > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
