Date: Thu, 9 Mar 2017 05:00:37 +0000 (UTC)
From: <ko7ss@yahoo.com>
To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: [TowerTalk] RF in the shack
My antennas are all above a metal cabin roof. I had big problems, spent $$$,
and now it all works great, even with 1500 W RTTY on 80M:
http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
http://www.balundesigns.com/
This should not be a problem!
73 Bill KO7SS on Mt Lemmon, AZ
## The above W1HIS article needs a serious re-write.
## W1HIS did an article for jan + feb 2013 NCJ, using 3 turns of 142 around
a pair of type 31 beads in binoc fashion.
Works, sorta, but peaks at 15 mhz, with 2200 ohms of rs, then drops off
rapidly on either side. So 2 are used in series. This
is the problem with the binoc config, whether beads or torroids used. Its a
real trick to peak the response where u want it.
http://www.kf7p.com/KF7P/Tech_Resources_files/NCJ%20Jan-Feb%202013%20p1of3.jpg
http://www.kf7p.com/KF7P/Tech_Resources_files/Ecellent%20Choke%20%20p2of3.jpg
http://www.kf7p.com/KF7P/Tech_Resources_files/Excellent%20Choke%20p3of3.jpg
## U could stagger tune 2-3 of these, so they cover the entire spectrum a bit
better, but binoc config is a tough cookie
to work with. too much stray C.
Jim VE7RF
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