I am finishing up 100 foot Rohn 45. I have a 7 foot flat top section. I have one TB-3 Thrust bearing on top and one 3 feet down and a Yaesu G-1000DXA at the bottom. I will set the mast in the rotor a
So why does a rotator want to have that second thrust bearing? I wanted two because when you take the rotor out and with only one thrust bearing you don't have control of the mast horizontally. With
Another option for mast stability when the rotor is removed is 2 pieces of angle iron, held together with a bolt and nut, shaped like the letter T. 2 U-bolts hold the top of the T to the tower face a
Possibly you should reread my posting ... A plate (positioned between the rotator and the top thrust bearing) with a hole (but without a thrust bearing mounted on it) positions the mast laterally jus
I assume what we're talking about here is a bearing to take a radial load as opposed to an axial load, or perhaps both (i.e. like a wheel bearing on a car). I can see that having two bearings and hav
How do you keep the antennas from turning in the wind and damaging your coax? John KK9A So why does a rotator want to have that second thrust bearing? I wanted two because when you take the rotor out
Most of the rotators I've seen (and I'm a long way from seeing them all) really need a load in the vertical plane for their bearings to work the properly. That works, but it translates all force to
Even with this http://www.rogerhalstead.com/ham_files/Tower29.htmb that has never been a problem. 73 Roger (K8RI) _______________________________________________ ____________________________________
John: What some on TT have suggested is installing two angle irons from the mast out to and beyond the tower legs. Use a muffler clamp to hold each angle onto the mast and arrange them so each rests
I agree, Jim. If there is any benefit to a second bearing, it would be reduction of the side load that is transferred to the rotator by the antenna side load when the top bearing behaves as a fulcru
I use a similar solution to hold the bottom of the mast when changing out a rotator. Three straight pieces of angle iron with u'bolts. Each piece attaches to the mast with one u-bolt, and goes straig
Gene, I agree that a second shelf would contain the mast while the rotator is removed, although I am not sure that the mast would flip out of the tower. I just don't see any benefit to having a secon
really need a load in the vertical plane for their bearings to work the properly. Roger, thank you for cutting to the chase. You are entirely correct but hardly anyone is aware of this and only the O
The bottom bolts on a Ham IV I had would work loose every few months when I had no load on it (I bought into the thrustbearing-takes-the-weight thing when I was new...). After I placed the full load
Maybe a flat washer and a spring washer would stop the bottom bolts coming loose. Blue loctite will certainly stop them coming loose. Mark N1UK G3ZZM _______________________________________________ _
Tailtwister with roughly 1/2 the weight of the array when dealing with a large stacked array and dual bearings. Hy-Gain doesnt specify maximum dead weight. Since very few would bother actually measu
Blue Loctite is excellent for many antenna jobs. It lubricates as you tighten the threads (prevents galling of stainless steel), locks the threads together so they won't vibrate loose, and seals them
I realize "large stacked array" is a relative term, but from experience, I don't consider the Tailtwister type of rotator any where near adequate for what would be called "large stacked arrays". Tha
When there is insufficient meat to drill oversize, even to a metric size, then JB Weld or a similar hard epoxy can be used to fill the hole. Then drill and tap to the original size. Ive done this wit
Have you ever tried to helicoil it instead? Mark N1UK G3ZZM _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting