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High voltage switch/relays for antenna?
TF3KX wrote: Hello: I am contemplating constructing an antenna where a center-fed HALF WAVE will be bent in a loop, only to be isolated at the almost-touching ends by a relay or some other means of a remotely controlled switch. When the relay contacts are open I will have very high RF voltages between the contacts, probably "a few KV" or even more. Are there any suggestions on where I could find a relay, if any, for this? Or any other means for doing this? An additional constraint is that the switching device needs to be light and small (say, 1-2 oz or 20-50 grams). Some ideas I have come up with a - A small vacuum relay (supplier, type?). - A home-made relay, providing more contact spacing than usually available. - A DC-motor (toy-type) driven mechanism to open and close contacts. - A mercury switch that could be tilted to make or break the contacts. - A string-operated switch to open and close the contacts (would run up the antenna mast). Any comments or suggestions? 73 - Kristinn, TF3KX Dunno.. I used to use 24 volt relays that normally are used for fan motors, etc, but I never fed at a high voltage point. I did run a lot of power though. They always worked fine, but who knows with a real high potential.. Might arc over.. I've heard tell of one kinda weird method that supposably will work. I've never tried it though. You run a line of coax from that open point on the antenna, to the shack, and use a switch on the end of the coax to open and close. Like I say, I've never tried it myself, so it' may or may not work... MK |
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