My sense is that "wrestling down" a 425+ lb load could be very dangerous. You might consider hiring an excavator or bucket loader with an experienced operator to lift the tower off the base and place
I don't think you need to bother with insulation. I've had no problems over the past 8 years with my 40m 4-square which has aluminum tubing mounted to pressure-treated 4x4s with plumbing clamps. Each
Joe, Hate to differ with you, but the Ham IV lower mast clamps will fit the AB-577 adapter. I have three AB-557s: a 75-footer with a Tailtwister and two 50-footers with Ham IVs. Both rotor models use
I just measures, and the top cap mast adapter on the AB-577 is 2.35" OD. _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
The same thing happened to me -- twice as well. The aluminum casting broke. The first time it was a clip on one of the launcher guy wires. That wasn't a terrible problem because the top and middle gu
Mike, You were smart to get off the tower. I often have problems with leg cramping while hiking in the mountains, especially on very hot and humid days. Another cramping mode occurs when I do a lot o
I'm a total novice at this, so pardon the dumb question. I can see where the middle thrust bearing adds no value and may be more trouble than it's worth, but isn't a middle bearing shelf useful for w
My MA770-MDP has only a single set screw to hold the mast. For this reason, I always rest the boom-to-mast clamp on the rim of the top section. That way, the mast can't slip into the tube. In additio
Dana, Can you describe the vibration in more detail? Do you mean it sways back and forth at the top? If the guys are adjusted properly, this shouldn't happen -- the mast should be dead still even in
Hi. I'm trying to use EZNEC 4.0 to determine whether there would be any interaction between a 2-el 40m beam at the top of a tower and various beams placed lower on the tower. For example, I've tried
Sounds like the antenna has slipped on the mast, the mast has slipped in the rotor jaws, or the lower rotor jaws have slipped on the pipe -- or any combination of the three! If you expect winds like
A fall-arrest lanyard *cannot* and *must not* be used as a positioning lanyard. It has one function only -- to save you from an accidental fall. The "stretchy" material (the shock absorber) is design
My motorized 72-foot tubular crankup is behind some trees about 250' from the shack, so I use the remote control feature. My comments on coax are mostly relevant for those who have motorized crankups
I've only done one tower base, but I agree with Bob and Steve. I hired a contractor to do the base for my UST MA-770MDP 72' tubular tower. As I recall, the spec called for a 3'x3'x6' hole. Despite us
Yes, I inquired about the alternative base for the heavy-duty 100-footer. It's on the order of 9'x9'x6' (not sure about that depth -- might be 9'!) Anyway, that seemed like an awfully large base for
John, How exactly do you use the Dillon series dynamometer? Looks like you'd have to disconnect the guy wire at a turnbuckle and insert the dynamometer. How do you then remove it and keep the tension
Hard to say without knowing the dimensions and layout of the chainlink fence. How high/long is it? Be advised that the Gap Titan is pretty much a dummy load on 80m. Also, don't run more than 500w out
Guess it depends on which component fails first. In my case, the dielectric in the thin coax melted, shorting the shield to the center conductor. It was a tiny area about 1" long -- hard to find! ___
Jim, That's a pretty steep hill. K4SQR told me the feedpoints should be at the same elevation. That caused me to find the flatest part of the hill I could for my 40m 4-sqr. The max difference in feed
Thanks to all for the quick answers. Found the info in the back of my Rohn catalog -- silly me for not looking. Guess I thought all the info needed would be grouped with each product. Anyway, the dra