John: I believe that it is generally accepted that the beams should be no closer than 6-8 feet. If you have a typical ham tower, extending the mast 15 feet above the top with the 40 up there could we
Eric, you can expect the 15 meter performance of the Bencher to be affected by the 40m beam at any reasonable spacing because the 40m elements are 3 half waves long on 15m. A spacing of 6-8 feet has
I looked at the prices at on line metals and they seem very high. They want $6.68/ft for 2x0.058 . My QST (Jan 07) received yesterday shows $3.10/ft for the same stuff from Texas Towers. I assume the
Some time back I remember reading about a problem with slippage in the Orion mast clamp. I believe it was on K7NV's web page. When Kurt speaks on mechanical issues I listen. If it was somewhere else
Chuck you were very wise to ask your questions before starting down a path with certain failure at the end. I am not familiar with the particular tower you have but I am reasonably sure it is similar
Bob: My Times Wire and Cable book has rather complete info on it. Pwr rating 10mhz 1250w, 50mhz 600w, max voltage rating 1200rms. It is the same as RG188a but jacket is FEP rather than PTFE. If you a
Wendell, you definitely need hardline or your losses will be severe. It can be buried without PVC cover. I have bought lots of Andrews 1/2 and 7/8 used at the Hamcom convention in Dallas when I lived
The photos tell me that it is not in the same strength class with UST and TriEx. The rod cross braces are smaller diameter than current towers. The width of the top section is smaller than current to
A friend is considering buying a used LM470 with the tiltover fixture. He will need a base ( the thing consisting of rebar cage and plates to bolt to the tower). He has tried 4 times to contact Tasji
Thanks to all who responded to my request for info on the LM470 base. All questions answered now, in fact one ham has an extra one for sale and that will possibly take care of the problem. 73, Dan, N
Mac, I faced the same problem several years ago. The bearings were no longer available at the manufacturer after several suppliers checked. One of the guys at the bearing place sugested a sealed bear
Scott, when I moved from Dallas to Spokane 8 years ago I rented a large U Haul type truck. My TX472 fitted inside it and the truck was full of shop equipment, antennas, and much more. It was a diesel
Roger, I have a Toyota Highlander with a roof rack. If you really want to have a good mobile signal with vehicles like this mount the antenna on top and unscrew it when garaging the vehicle. Here is
My radials are soldered to a wire ring about 18 inches in diameter around the base of my Hytowers. The wire connecting the coax shield to this ring is about 6 inches long. The buried hardline extends
At my former QTH in Dallas I buried some aluminum #12 radials for my Hytower. They were totally corroded away in 2 years. The soil there was very conductive and, as I recall, alkaline. I doubt if it
If you are using a hand riveter you need 3 hands or a helper. I use a hand riveter and clamp one of the handles in a vise on my work bench. You only need one hand to operate the other handle and have
We have seen numerous posts on TT about mast clamp slippage. The gist of the posts is that we need to have a tighter grip on the mast and, hopefully, the rotator will tolerate the torque without dama
Gary, I have seen 2 different mounts like you describe. One uses two verticals spaced about 2 feet of the rail material used in garage door openers. The trolley has wheels designed to travel inside t
Seems there was some concern by one of the posters about cable capacitance effect on the motor pulses. I believe that water has a very high dielectric constant (around 80?). Could it be possible that
Clint, our club web page www.sdxa.org has a link to a set of impedance measurements of bead and solenoid baluns at different frequencies. Click DX tips and you will be led to the measurements. 73, Da