I have had a TH-11 for many years. I agree with Steve. I have tried several 40m dipoles and yagis 10' above it, at different boom angles, and there was interaction on one antenna or another every tim
Perhaps when they were bought out by Telex they were put on the back burner, or became a step child. I dealt with Hygain for years, buying a Hytower and a yagi in 1962, and many antennas since then.
Does the LPDA manual give a minimum height above ground to get the published specs? Looks to me like 20 and 17 meters will be influenced by the nearness to the ground. (((73))) Phil, K5PC "The Dark
You can check with the 80m big guns; I think you will find that you are short about 40 feet of tower to get an 80m yagi to play well. I always heard that 135 feet is a minimum height for these beast
You did not mention if you have a choke balun at the feed point. Before you go to a lot of trouble, why not install a good balun, and a short piece of coax and sweep the thing again with your meter.
Why don't you put a 75 to 50 ohm un-un transformer at the point where the CATV-coax junction is. This will serve as a choke from 1-30 mhz, and your radio will see 50 ohms on all bands. Beware of the
Hi Tom, I just finished soldering 100 radials to a 1/4 inch circular tube last week. I cleaned the tube with plumber's cloth first, and just used an open flame torch and Radio Shack solder. It turne
Guys, That is correct. Sub panels are wired so that the neutral and ground wires are seperate. The ground is bonded to the sub panel box, but the neutral wires all float and are insulated from the bo
There is an optimal height for every band and every location. Here in Texas, 72 feet for 20 meters and 42 feet for 15 meters. 40 meters is not an issue here, because your tower is too short. Good DX
Paul Harvey reported the story today...it HAS to be true! Perhaps Jessie Ventura should reconsider his re-incarnation desires..... Phil, K5PC -- FAQ on WWW: http://www.contesting.com/towertalkfaq.ht
If it were me, I would resonate and space the verticals for 3.510, and use switched capacitors to QSY to the SSB window. The caps are a much less lossier proposition than coils, and you have more ca
Additions to "Lemon" comments: I put up my first rotator in 1954. When the television craze started here in Texas at that time, we all had to have fairly complex antenna systems; especially those of
Four turns, 2 inches in diameter, spaced 1/2 inch apart. Push and pull the coil like an accordian to vary the frequency. (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html
I have several sets of fiberglass insulators for Rohn 25 E-Mail for details/prices. Phil, K5PC -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Adminis
I think this was an "old wive's tale" started years ago by the owner of a cheap, flimsy, crank-up! I have owned and shunt-fed a Tri-Ex LM-470D for years. I have worked the world on 160 with it and ne
I'm putting up an 80m four-square, as pictured in ON4UN's new book on page 11-79. It shows that the dipoles are pulled out away from the tower at a 30 degree angle. This is not very close to .25 wave
I do not believe you can make a blanket statement like that. I do not buy for one minute that pressure on the rotor is needed for sealing, or any reason. The use of two thrust bearings is ideal, as t
I had one of these beasts for many years. Are you using the stock Telrex balun? Open it up and check for water damage. Try varying the coax length to the transmitter on 10m. If the resonant frequency
That is the way I have seen it done many times. Use the best bolt you can find. (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Ad
That will work fine, Paul. I use a 1 meg ohm wire-wound 25 watter accross my 450 ohm line from my high dipole. For my 160 meter ground plane, I wound 2 RF chokes out of #20 wire on 3/4 inch PVC pipe