>Why do you feel a need to improve it?
Thanks for the response, Charlie!
I'm concerned about a few things:
1) I'm thinking the antenna is electrically too short. After all, the
Yagi at the top really isn't adding too much top loading. And I'm thinking
adding a couple of top loading wires connected to the tower
might be beneficial.
2) What exactly is the analyzer telling me when it says C:15893pF?
I'm far from an engineer, but something tells me that's way high. Or is it?
On 12/10/14, Charlie Cunningham <email@example.com> wrote:
> From your description and your measured data, Larry, I don't see how you
> could improve the antenna noticeably! Why do you feel a need to improve
> I appears to be resonant, well-matched and it appears to have an
> ground image system! I think you might be kidding yourself if you change
> anything! As the old adage says n "If it ain't broke -don't fix it"!
> Charlie, K4OTV
> -----Original Message-----
> From: Topband [mailto:firstname.lastname@example.org] On Behalf Of Larry
> Sent: Wednesday, December 10, 2014 2:41 PM
> To: email@example.com
> Subject: Topband: 160 Shunt-Fed Tower Readings
> The antenna is a 94' Rohn 25, with a Force 12 24'boom Delta 6BA on top.
> that the elements are insulated from the boom. The base of the tower is
> 73 radials are attached to the base ranging in length from 130'-250'.
> 15,000 feet of radials, average length of ~200'.
> It is fed through a series 1000pF 10KV Jennings vacuum variable.
> The shunt is a 4 wire cage about 3" in diameter and attached at ~45'
> level. It is spaced about 3' from the tower.
> Here are the readings I get from a RigExpert AA-30 at the feedpoint:
> 1.830 kHz
> Series model: lZI: 59.7 Ohms
> R:59.5 Ohms
> SWR: 1.23
> X:5.6 Ohms
> C: 15893 pF
> What are these reading telling me,and how can I improve the antenna?
> Thanks, in advance!
> Larry K4AB
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