You might be able to use an Omega match system to load the tribander boom on
40M. I'm not familiar with the tribander mentioned so I don't know it's boom
length.
73, Stew K3ND
________________________________
From: Brian Alsop <alsopb@nc.rr.com>
To: towertalk@contesting.com
Sent: Wednesday, August 21, 2013 2:07 PM
Subject: Re: [TowerTalk] Question on mast height above tower
Another possibility.
Put the rotary 40m about 1' above the tribander and at right angles to it.
The extra few feet of height lost won't amount to much. Also you would
still have the advantage of pointing it at the signal of interest.
That will help with the load, but won't impact the torque.
73 de Brian/K3KO
On 8/21/2013 17:56, Gene Fuller wrote:
>
> These numbers looks like calc's for bending moment at the top of the tower.
>
> What about torque ?
>
> Would it be possible to put the rotor plate lower in the tower and pick
> up some extra restraining moment with "overkill" in the mast ?
>
> However, this still wouldn't help the torque problem. If he's stuck
> with this tower and the given antenna family, how about a leg anchor
> plate and torque bars at the top of the tower ? This would also help
> the bending moment problem. Pretty soon a more heavy duty tower, or less
> ambitious antenna system, starts looking good !
>
> With some extra $$$ and a little engineering there will be a good answer.
>
> Gene / W2LU
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|