Topband: 160 VERT

[Tom W8JI]

There is no matching system at the base, and the antenna is pretty short. 
The SWR should be higher than 3:1 except losses are involved. System loss 
will tend to lower the SWR. The worse antenna efficiency becomes (within 
limits), the lower SWR will become.

You could add a shunt capacitor from the feedpoint to ground (directly 
across the coax) or an inductor across the coax. You probably are going to 
need 35 ohms of capacitive or inductive reactance shunting the coax, and to 
retune the antenna with that reactance there. That would be a 2400 pF 
capacitor or a 3.1 uH inductor shunting the coax. The inductor would be 
about 10 turns 2 inches in diameter, and might be easiest.

Then you just retune it to resonance.






----- Original Message ----- 
From: "Don" <w4dee at truvista.net>
To: <topband at contesting.com>
Sent: Saturday, January 17, 2015 8:49 PM
Subject: Topband: 160 VERT


>I put up on of K6MM’s helically Wound 160 vert can not get SWR down
> I put up k6mm Helically wound vert for 160 but can not get SWR below 3:1 I 
> have 8 - 1/4 wave radials of 16 awg wire out .  Any suggestions you can 
> offer would be appreciated
>
> W4DEE
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