Your last idea is the best. Put the mast inside the tower at the bottom and pull it up the middle when you are done. Doing it after the top is on safely is a big pain, though with care and a very lon
Actually... the knot/shackle or a through-bolt doesn't matter at the bottom of the mast. Only the top of the mast has to fit through the bearing(s) or top tube. Raise the mast up to near its final po
Ummmm, it wouldn't be much of a 'thrust' bearing if the set screws couldn't hold the weight of the mast. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node:
Just to put in another anecdotal comment... all my masts have all their weight supported by tb-3's with no weight on the rotors. This includes 5 towers, the oldest has been up 20 years now. Where I h
The 3 large bolts with locking nuts used on tb-3's and tb-4's are more than adequate to handle the weight of amateur installations and have never slipped on me. David Robbins K1TTT e-mail: mailto:k1t
I have had good luck with two pipe wrenches, put them on in opposite directions and lift up and turn back and forth a bit while pulling. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://
Sounds like time to buy a chainsaw! David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net __________________________________
The story of the installation of my new m-squared 40m4lldd is now on my web site at: http://www.k1ttt.net/2005towerwork.html David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.ne
I stand up a section where I want to put the tower and use a carpenter square as a sighting device to get them approximately located. Then calculate the proper spacing and use a piece of rope to meas
That would depend on how conductive your dog is. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net ____________________
At the request of someone who wanted to make a case about using that gunk I recently dug out some old elements that had been assembled and in the air for probably 15 years. He could not get a voltage
1. keep hands and feet clear of the mast at all times. 2. make sure thrust bearings are tight, add a muffler clamp or two above one of the thrust bearings just in case they don't hold. 3. remove roto
There can be some effects at high altitudes for vhf/uhf stuff. there can be tropo ducts that are only experienced above a certain altitude. It is also used in figuring line of sight paths for microwa
Well, if its got 3 legs it's a perfect triangle, unless they are in a single line. However, if those 3 legs are not part of a perfect 'equilateral' triangle I would say something is wrong with the to
I would be surprised if rohn had done specific foundation design unless it was a very large tower for a very rich customer. That is usually left to the buyer/installer to get a local engineer to do a
http://www.k1ttt.net/technote/tram.html look at the 3 page scanned article at the top of the page. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69M
There have apparently been some dns problems with that server. Yesterday afternoon I couldn't get any of the links, today it is working fine. If there was a dns change or routing problem it could tak
Its not really a loss. It is current that would otherwise be on the other side of the dipole. The problem with it is: 1. it takes away from the desired pattern 2. is often the wrong polarization 3. a
I once had a 40m 4-square inside an 80m 4-square and they functioned adequately. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc
Some possible problems to check are here: http://www.k1ttt.net/technote/techref.html#rotors David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or t