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Topband: Shunt-Fed Tower 160/80 Meters

To: topband@contesting.com
Subject: Topband: Shunt-Fed Tower 160/80 Meters
From: John Cowan <w0tmm@yahoo.com>
Date: Tue, 12 Dec 2006 15:23:17 -0800 (PST)
List-post: <mailto:topband@contesting.com>
I have two shunt wires on my tower now. One for 160 and one for 80. The 160 
side is working fine now. The 80 meter side has the following readings:

3.25 MHz Rs=111 Xs=13 SWR 2.7
3.50 MHz Rs=129 Xs=0  SWR 3.2
3.75 MHz Rs=189 Xs=0  SWR 4.5
4.00 MHz Rs=230 Xs=0  SWR 6.3

I have a 500-pf cap on each shunt wire.

Should I move the shunt wire closer to the tower or move the tap point downward 
to get the SWR down on 3.75 MHz?

John W0TMM

 
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