[TowerTalk] Voltage at ends of yogi parasitic elements?

john at kk9a.com john at kk9a.com
Mon Oct 17 12:44:24 EDT 2016

That is a good question.  Years ago I thought of building an 80m vertical
with a relay on top to make it a 160m inverted L at my P40A home but I did
not know if even a vacuum relay would hold up and I knew that there would
be RF issues with the control wires running down the vertical. I had never
seen it done and did not want something likely to fail. If you are just
changing band segments most manufactures are using switchable loading
coils at the feed point.

John KK9A

To:	towertalk at contesting.com
Subject:	[TowerTalk] Voltage at ends of yogi parasitic elements?
From:	Rob Katz <rob.katz at thelegacycenter.com>
Date:	Sun, 16 Oct 2016 23:09:11 -0400

I’m playing with some wire yagis, and I’d like to put relays at the ends
of the
parasitic wires to switch the director to a reflector (and vice versa). 
If I’m
driving the antennas with a full 1.5 KW, what would be the maximum voltage
I can expect at the ends of the PARASITIC elements?  Even a rough estimate
would be useful, I just need to get a sense of what kind of a relay I would
need to use.

   Rob  K4OV

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