Stan, Thanks and another daft question.....what sort of wire would recommend for the coil?
Regards Paul MM0ZBH On Fri, 21 Sep 2018, 21:20 Stan Stockton, <[email protected]> wrote: > Paul, > > The antenna is too short since you want to operate at 1825. Make it > longer by about four feet. > > Then wind a coil that will probably have 20-30 turns of wire and maybe 3 > inches diameter and connect one end to the bottom of the antenna and the > other end to your radials. > > You will have to experiment with the number if turns on this hairpin but > you are trying to bring the R up to about 50 where you will see a nearly > perfect match. > > 73...Stan, K5GO/ZF9CW > > On Fri, Sep 21, 2018, 3:07 PM Paul Mclaren <[email protected]> wrote: > >> Looking for the advice of the experienced hams for what if anything I >> should do to make my 160m inverted L more efficient. Being realistic I >> am >> limited as I have a postage stamp garden so can't really lay more radials >> or change much beyond the inverted L. I guess the question is would some >> sort of match at the base help? >> >> Antenna is inverted L with 18m vertical section >> >> Radials are approx 40 x 10m lengths and a layer of copper mesh out to >> about >> 5 metres from the base as well. >> >> Using my RigExpert AA30 analyser the readings are: >> >> Usual TX frequency: >> >> Freq 1825khz: SWR: 2.6, R33ohm, X 31ohm, Z 44ohm, L: 2700nH >> >> >> Lowest SWR is: >> >> Freq 1882kHz: SWR 1.7, R72.5ohm, X20.5ohm, Z77ohm, L: 1900nH >> >> I'll be honest and confess I don't fully understand how to best optimise >> the antenna and what "good" looks like particularly on the low bands. >> >> Help please and thanks in advance. >> >> Regards >> >> Paul MM0ZBH >> >> The antenna works but no >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband >> > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
