PROTECTED] On Behalf Of Solosko, Robert B
(Bob)
Sent: Tuesday, February 19, 2008 1:00 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] OT: Relays for antenna switching
Hello All,
I planning to put up a 20m switchable vertical yagi made up of 4
vertical elements, with a relay control box
Hello All,
I planning to put up a 20m switchable vertical yagi made up of 4
vertical elements, with a relay control box to switch the elements to be
either the driven element or the reflector elements. Preferable the
relays should be DPDT, although I can use SPDT relays if they're cheap
Bob ...
I recently built an outside switching box for another antenna project. Not
switched verticals like you will have, but a way of switching a multiband
doublet from doublet to tophat vertical operation. Also at 100W power
level, so I'm guessing that the possible maximum voltage and
I've built a lot of HF relay-switched projects, including a relay-based QSK
switch for my ALS-600 amplifier. I've found that virtually any relay works
well at HF as long as the contact rating and voltage breakdown are
sufficient.
Since Power = I-squared R, at 100 watts and 50 ohms, you will have
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