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High voltage switch/relays for antenna?
In article .com,
"TF3KX" wrote: 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? I assume that when used on higher frequencies where the antenna is more than 1/2 wave long, the relay contacts are to be closed. If that is what you want to do, and if the higher frequency bands are even multiples of the lower frequency, then you could connect the ends of the 1/2 wave antenna to a shorted 1/4 wave stub made out of open wire. At the lower frequency this would place a very high impedance between the two ends of the antenna, and at even harmonics where the stub would be an integer number of 1/2 waves long, it would place a low impedance between the antenna ends. Cheaper than a relay, too. David, ex-W8EZE -- David Ryeburn To send e-mail, use "ca" instead of "caz". |
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