[TowerTalk] Top of 45G Tower- Stress

[Jim W7RY]

I'm in the process of installing my 70' Rohn 45 tower. I'm looking at where the rotator is placed in reference to the top of the tower. I'm using a 21 ½ foot mast (1/4 wall chrome molly etc). I'm using a Rohn 45AG4 top section with a heavy duty thrust bearing on the top of the tower. I will be using a Orion OR-2800 rotator.

The lowest that I can get the rotator plate in the tower is 3 feet below the top of the tower.

 

I will be putting a 2 element 40 on the top of the mast and a TH7 just above the thrust bearing. I want to keep as much spacing between the 2 antennas as possible. I estimate about 14 feet between the 2 antennas with the boom support of the 2EL 40 at the very top of the mast.

 

How much stress will this put on the top of the tower? How about on the rotator? Too much? What about changing the rotator? The sort end of that mast could get a little unruly!

Opinions please...

 

Thanks and 73!

Jim W7RY