[TowerTalk] Voltage at ends of yogi parasitic elements?

[David Robbins]

I have done a reversible 2 element 80m one.  the elements were cut for the driven element length, then I ran a 1/4 wave coax from the feedpoint of each element to a switchbox in the middle.  In the switch box I had relays that connected the feedline to one element and a variable capacitor to the other one.  the capacitor through 1/4 wave of coax looks like an inductor which you can then use to tune the reflector.   its much easier to tune at the middle with either capacitors or inductors or feedline stubs switched in and out.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Rob Katz
Sent: Monday, October 17, 2016 03:09
To: towertalk at contesting.com
Subject: [TowerTalk] Voltage at ends of yogi parasitic elements?

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 that 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.

73,
   Rob  K4OV

--

Rob Katz, Senior Partner
919-219-5324




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