>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? 73, Larry K4AB On 12/10/14, Charlie Cunningham <charlie-cunning...@nc.rr.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 > it? > I appears to be resonant, well-matched and it appears to have an > excellent > 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"! > > 73, > Charlie, K4OTV > > -----Original Message----- > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Larry > K4AB > Sent: Wednesday, December 10, 2014 2:41 PM > To: topband@contesting.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. > Note > that the elements are insulated from the boom. The base of the tower is > grounded. > > 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! > > 73, > Larry K4AB > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband