What's the word these days on guy wires. Break 'em up with insulators or make up transmission line sections to get away from resonance near operating freqs? Thanks, -bob
I've spent as much time as anyone worrying over guy wire resonances. The ARRL anti-resonant sections are a myth. They don't work because the guy wires are in the antenna near field and currents are N
For completeness, when looking for guy wires that don't interfere with HF antennas, you need to look at fiberglass guys as well. In the quantity I used, they were cheaper than Phillistran and cheaper
Yup, fiberglass if you know to manage the sproing and have some way to deal with the minimum order business. Good stuff. What kind of commercial installations? AM radio stations stay away from dipole
Guy, All the points you are making, I have never heard anyone complain about, including the 486/f "thing". What, BTW, is that all about? That formula is an approximation. I've used it for years and n
I just modelled a two element phased array, and adding a "nonresonant" wire right in the middle of a recommended "safe length" 1/8 wl below the phased array center decreased the null from almost inf
Can someone quantify the value in db in either angle of radiation, forward gain or other significant factors when a tri-band beam at 100ft is retro-fitted from guy wires which are not broken up with
At the risk of getting into something that I really know nothing about on a technical level, let me give you some anecdotal input. I had 100 feet of Rohn 45 guyed with quarter inch ehs as follows: Gu
In my case, using all P-stran (except for the EHS lower end tails) meant I did NOT have to make up a bunch of big fat egg insulator connections using EHS. Count the HD strain insulators, the extra gr
Just a word of something that "has" worked for me in the past.........we are dealing with wire "lengths" that interfere with "some" freqs right?........It helped me in the past when I simply "added"
N3RR asked: Bill, Rick Craig - N6ND - had some poorly performing yagis partway up a big tower which had steel guys proken up with insulators. When modeled using K6STI's Guy modeling program, it imita
Since you asked, the reason I use all Phillystran is because 1. I got it for an affordable cost and 2. it makes sense that my actual antenna system will get closer to how it was modeled (I didn't bo
Many probably don't bother or notice, if the SWR is not killed, many would not care as long as a yagi seemed to have a pattern and took power. And someone can make the case that for much amateur acti
Guy, I think if you look back a few years (perhaps 20-25), the whole theory of guy resonances was first mentioned and explored by the late Jim Lawson, W2PV, and I think he provided the info that is n
For what it's worth, another supporting anecdote. I have a Force 12 EF-240S, at 104 feet, on a Rohn 25 tower with top guys at about the 95-foot level. Originally, I had 21-foot semi-rigid fiberglass
"It Depends"... It depends on how the steel guys are configured (insulator placement) etc. A friend had his first insulators 10 ft out on guys 10 down from his tribander. He reported that the antenna