[TowerTalk] Tower Detuning

[Jeffrey Okamitsu]

How are you setting up the W8JI parallel resonant circuit?

I detune my 140 foot tower using the W8JI method because it was coupling into 
my 160 m inv L.  Works great.

I hang a wire from aboout 80 feet to ground and use a 1500 pF vacuum variable 
that I can tune remotely from the shack - allows me to tweak the tuning as I 
move up and down 160.

GL

73, Jeff W3KL
 Jeffrey K. Okamitsu, PhD, MBA
+1-609-638-5402 US Mobile Phone
+1-240-421-0692 GSM Mobile Phone 




________________________________
From: Mike Wetzel <mjwetzel at comcast.net>
To: towertalk at contesting.com
Cc: topband at contesting.com
Sent: Mon, October 4, 2010 5:51:36 PM
Subject: [TowerTalk] Tower Detuning

Dual posting Towertalk and TopBand.



I need to detune a tower that has 2 side mounted rotating 20 meter antennas
on it (not TIC rings but swing arms) (tower 170', boom 46').  I have tried
the sectionalizing method (from W8JI's website) but unable to make this work
so I was thinking the only other way is to do the  3 wire skirt method (NCJ
Nov/Dec 2005 WX0B article).  With the rotating side mounted antennas does
anyone have any experience with how close to the tower the skirt wires can
be?  Any other ideas that I might try to detune it?



The tower seems to be interfering with a new 8 circle (EFBS) 80 meter rx
array (f/b only 10db and pattern is not clean).



Thanks,



Mike W9RE



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