Hi Towertalkers, I spent much time this summer rebuilding after storm damage last winter. As part of that I upgraded from inverted V's at 90 and 105 feet for 30m and 40m to an OptiBeam OB1-4030 at 10
Hi Paul, I can provide you a high performance diagram for a 80m vertical antenna. It is based on a 12m spiderbeam pole (fibreglass). Next document contains the details. Apologies, it is in spanish, b
Paul, An alternative which works great for me is to start a quarter wavelength of wire out a few feet, insulated from and up about 50 feet on your 160m shunt fed tower. Run it down at an angle so at
Author: Tony Brock-Fisher via TowerTalk <towertalk@contesting.com>
Date: Thu, 30 Dec 2021 08:09:23 -0500
Paul My solution for 80m is a pair of phased delta loops as follows: Each loop is an equilateral triangle one wavelength long. They are fed 1/4 wavelength from the top, which is fairly near a bottom
Author: Charlie Anderson <charlie12-21@hotmail.com>
Date: Thu, 30 Dec 2021 15:34:20 +0000
Break down and get DX Engineerings 80 meter heavy duty tip over vertical. A full 1/4 wave vertical. NOT cheap, but super easy to raise and lower. I have helped construct 5 and have seen what they can
How to make short self supporting decent performance 80 and 160 verticals is an *interesting* design problem ;) . My goal is to make one for 160m so I can get away from a dense tree area of RF absorb
Hi Paul, A quarter wave is a quarter wave electrically. The rest of it is all mechanical. A thin conductor (whip) on top is fine, because in a quarter wave antenna, most of the current is in the bott
Why can't it be guyed to help stabilize it? Even three ways at the top with dacron or kevlar to some deep earth screws is better than nothing, especially if you use cheap leg insulators. Most leg in
25G tower with whip on top: Why series-feed this thing if you don't have to? Stick the tower up and guy it with Philly, or with steel cable with insulators near the tower. Then shunt-feed it. Nice an
Perhaps UHDPE plastic cylinders would do as well as fiberglass? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will
Many ways to skin that cat. I have a 120 ft Rohn 25 guyed at 30, 60, 90, and 120 ft with about 4 ft in a poured concrete base. I also have an unguyed 35 ft Rohn 35 (the one private labeled for Motoro
If your vertical is out in the open on flat land and you have a wind storm, it will destroy plastic leg insulators and the ceramic ones hams find aren't made for this. Not sure about the fiberglass c
Perhaps UHDPE plastic cylinders would do as well as fiberglass? I use acetal, comparable to aluminum in strength, and as easy to work with. Kurt _______________________________________________ ______
Rob, What your suggesting is similar to the hy-gain hi-tower. I have 4 of these striped down to just he 24 ft tower ( 3- 8 ft. BX tower type) = 24 ft. and a 43 ft. stinger 2 od. to 3/8 od. tubeing Be
IMHO: It is MUCH easier in terms of structural engineering to use a guyed structure vs self supporting. Based on questions posted on TT, I think many people greatly underestimate the difficulty of se
UHDPE likely doesn't have the strength and it does creep besides. <4000psi yield strength. Fiberglass maybe is a better bet. However, there are two kinds or rod, pultruded where the fibers are axiall
I have received a large number of responses both on and off list. Thanks everyone! Several mentioned adding an 80m wire vertical alongside the 160m shunt fed tower, series feeding the 80m and using t
Paul, I have been using an 80m drop wire, I call it, for years off my 160m vertical. My irrigation pipe vertical is 72ft with 4 - 30ft top hat wires for 160m. The 80m wire is installed and insulated