Topband: Vertical SWR problem

[JSimon at GrahamDunn.com]

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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