Topband: Shunt-Fed Tower 160/80 Meters

[John Cowan]

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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