T hanks for the correction, Stan. My old eyes missed that!! A 90' tower won't require much top-loading at all!
Sorry for my error 73, Charlie, K4OTV -----Original Message----- From: Stan Stockton [mailto:wa5...@gmail.com] Sent: Wednesday, February 04, 2015 1:41 PM To: Charlie Cunningham Subject: Re: Topband: [Bulk] Top Loading wires It's a 90 foot tower he is describing. Sent from my iPad > On Feb 4, 2015, at 12:11 PM, Charlie Cunningham > <charlie-cunning...@nc.rr.com> wrote: > > Gee, I surely agree with Grant, Larry! I've used EZNEC for MANY years, with > great results, and I've designed, built, tested and measured many wonderful > EZNEC designs - including some really complex "killer" antennas! > > > I do think that 28' top loading wires will be WAY TOO SHORT atop 50 ft. of > Rohn 25! More like 50-70' will be needed to resonate that tower. You will > probably do just as well with TWO top-loading wires in a Tee configuration! > The point is for the top-loading wires to extend the tower to 1/4 wave > resonance on 160. Of course you could make an excellent 80m antenna with the > 50' tower and some modest top-loading wires approaching the length that you > are considering. GL! > > If you are going to be experimenting with low-band antennas, EZNEC is a GREAT > investment > > 73, > Charlie, K4OTV > > -----Original Message----- > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Grant > Saviers > Sent: Wednesday, February 04, 2015 11:28 AM > To: Larry - K1UO; Topband Reflector > Subject: Re: Topband: [Bulk] Top Loading wires > > With an insulated tower, the cheapest EZNEC and other free NECs will yield > good results. Would you rather climb, cut, and trim a few times or spend $89 > to get EZNEC? Simple to learn. And the demo version is free eznec.com > > Grant KZ1W > no affiliation, just a long term happy user > >> On 2/4/2015 7:27 AM, Larry - K1UO wrote: >> Could someone tell me the length of top loading wires (4 wires planned) >> needed to add to the top of a base insulated 90 foot Rohn 25g tower to >> maximize the radiation resistance on 160 meters. I understand there is a >> point of diminishing returns on the top loading lengths. The 4 wire angles >> will be around 45 degrees or as close as possible. If I knew how to model >> ,or even had a modeling program, I would attempt this already relatively >> simple task to many. >> From 50+ years of practical experience, I am ‘guessing’ maybe 28 feet long >> each? >> >> >> >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband