Topband: Vertical SWR problem

[George & Marijke Guerin]

Jim,

Move the tap from the vertical toward the hot end of the loading coil 
further to load the antenna down toward 1825 by putting more inductance in 
the circuit.
For better ground add some more radials, not necessarily full 130 feet long 
to better cover the ground currents close in, inbetween the full length 
radials.  Anything from 65 feet and up will do unless you intend to end up 
with over 60 full length radials.

Good luck,

George    K8GG

----- Original Message ----- 
From: <JSimon at GrahamDunn.com>
To: <topband at contesting.com>
Sent: Friday, November 26, 2004 6:45 PM
Subject: Topband: Vertical SWR problem


> I've just installed a Titanex V160S vertical (87') with a V160AS (160m 
> only) tuning unit. Yesterday I connected 12 radials (130') each, adjusted 
> the taps on the tuning unit coil with an MFJ SWR analyzer, and got the 
> resonant point down to about 1850 khz. with tolerable SWR (less than 
> 1.5:1) at 1805 khz. So, here's the problem: today I added another 16 
> radials, and the resonant point moved up to 1900 khz. The SWR is now high 
> enough at 1825 khz that the amp shuts down. I tried adjusting the taps on 
> the coil in the tuning unit, but to no avail.
>
> Anyone have any suggestions as to how to get the resonant point to a lower 
> point in the band? Thanks.
>
> 73, Jim   W1YY/7
>
> (sorry for the duplicate message)
>
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