-----Original Message-----
From: w3oa@roadrunner.com [mailto:w3oa@roadrunner.com]
Sent: Saturday, November 20, 2010 11:36 AM
To: towertalk@contesting.com
Cc: sturpe@gmail.com
Subject: Tune 160/80 Vertical
I'm helping a friend who has an 80 meter 1/4 wave vertical. At the top, he has
a 160 meter trap then a wire extending horizontally for 160 meters. It is
therefore an inverted L on 160.
The SWR on 80 is good and can be adjusted nicely by changing the length of the
vertical component. 160 meters, however is somewhat of a problem.
The minimum SWR he can achieve on 160 is about 1.7:1. Of course the object
here is to lower the SWR on 160. Here are some readings we took with my MFJ
-269 antenna analyzer in case this helps anyone.
1.770, Rs 16, Xs 0, SWR 3:1
1.800, Rs 27, Xs 15, SWR 2:1
1.825, Rs 45, Xs 26, SWR 1.7:1
1.85, Rs 79, Xs 31, SWR 1.9:1
1.875, Rs 128, Xs 2, SWR 2.5:1
Can anyone point us in the right direction to find a solution?
Thanks,
Dick, W3OA
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