I agree that water inside a tube can freeze and cause it to fracture. On all of my antennas the horizontal elements are open at each end so water does not build up, freeze and crack the tubing. It se
I had a 350' run at my previous station and I direct buried 1 5/8 hardline without any problems. John KK9A I am in the process of moving my tower, which requires me to re-cable the feedlines. The new
I have a similar vertical that I built that works pretty well on top band at P40A. Mine 54' feet of freestanding aluminum and I top load it with a wire going back toward the ground in an inverted "L"
I am not at all familiar with the antenna you are referring to, however it sounds like you have modified it into a conventional style yagi. If the impedance really is 13 ohms and you are using a 4:1
Since it is unlikely that your 2el 20m beam has a long enough boom for a 40m beam, I would just add a 40m dipole element to the middle and run a separate feedline. I have not modeled this, however I
You probably should look at a Rohn catalog so you don't have to guess or rely on other people's guesses. It will tell you at what height to guy your tower, what size guy wire to use, how many cable c
John, W2GD / P40W is a very nice guy and a great contester. I am very saddened to hear this news. John has given me a lot of contesting advice over the years which I am sure has improved my scores an
Star guying substantially reduces the twist on a tower. Torque arms are much less effective. According to K7LXC : When Rohn implemented one of the early EIA/TIA-222 tower standards, they found that t
I think that the 40m OWA design is only available to people who purchase the antenna. If it is publicly available I would also like to see it. John KK9A I obtained a used 3 element yagi on a 39 foot
I own two Array Solutions Sixpak antenna switches and both had the problems you describe. One was 350 feet from my shack so I thought that the problem was from the long control line. I also use Top T
They are open frame relays and the only noticeable identification on them is WX0B. John KK9A Does anyone know what make/model of relay is inside this box? ____________________________________________
As I recall five years ago you were using a 15 volt power supply and still having to occasionally kick the relay box to get them to engage. Do you have any idea what was done to the relays to solve t
I too have replaced many many potentiometers, hash filters and a few motors on TIC ring rotators after lightning strikes. Is there a way to protect them? Do MOVs protect the motors? John KK9A I'm sur
What is the adjustment procedure? Fellow TowerTalkers, Just a follow-up post regarding my posting about the endless problems with my sixpak switch. Jay did contact me and talked me through the whole
It's hard to imagine the stiffness of the wire not having a dramatic effect on this gauge. Apparently <:-)) I'm running Phyllistran with 10 to 15' headers of EHS at the bottom. It seems to matter lit
I want to measure the impedance of an antenna and it is not practical to connect an antenna analyzer directly at the feed point. I believe this can be done using a 1/4 wl section of coax. Can it be d
I guess how much money you save depends on how long your cable run is. The remote control unit is $1449. John KK9A I use a Green Heron to control a K7NV prop pitch turning a MonstIR. It is absolutely
Do you really need a guy anchor 8 feet high? The leverage at that height is high and it would require a very strong steel beam and many yards of concrete. There is a lot of information in the archive
I have seen this done in the Caribbean where corrosion is a huge problem. Aluminum corrodes rapidly when in contact with stainless steel, such as under an element hose clamp and taping the joint may
About 15 years ago I purchased a Rohn 65G tower with a pier pin base. The drawings showed a bearing plate, but one was not included with my tower package. I called Rohn and I was told that it was not