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[Towertalk] More on tree antenna mounts

To: <>
Subject: [Towertalk] More on tree antenna mounts
From: (Stan & Patricia Griffiths)
Date: Tue, 10 Sep 2002 01:55:28 -0700
I see an interesting directional indicating problem with the beam attached
under the rotator.  When you push the control for the rotator to rotate
"clockwise", the normal part of the rotator that turns now remains
stationary and the part normally attached to the rotator plate (now attached
to the beam) turns "counterclockwise".  You could probably modify the
indicator system to account for this . . .


----- Original Message -----
From: "W0UN--John Brosnahan" <>
To: <>
Sent: Saturday, September 07, 2002 8:29 AM
Subject: Re: [Towertalk] More on tree antenna mounts

> >
> > > > Another way is to string a guy wire between two trees; use it to
hang a
> > >  > rotor upside down and a beam hangs from the rotor.
> > >
> >     A good way to fill up a HAM IV or T2X with water. Don't know about
> Don't think you actually have to hang the ROTATOR itself upside
> down. Just mount the normal top side to the fixed guy by using a
> short vetircal pipe mast welded to the center of a long horizontal pipe
> which is supported by the horizontal cable.  Then mount the beam to the
> normal bottom side of the rotator.  Easy to do if the bottom side has
> a mast mount clamp, but it could also be done with a flat plate bolted
> to a flat-bottomed rotator and then the plate could be drilled for U-bolts
> to attach the boom.
> Probably not all that wonderful around here were the trees are only
> 25 ft tall, but it is an interesting idea conceptually--at least
> for relatively modest beams.
> I could also see this technique used between two towers when tuning
> a beam and rotation is also desired.  But not sure how long the
> swinging would continue after movement (making the cross-pipe long
> would greatly reduce the rotation instability, but not the bouncing
> and swaying mode.
> Probably most useful as a Saturday-morning mental exercise than
> as a real project--but it is always nice to have "secret weapons"
> for unusual circumstances--such as Field Day in the Pacific NW.
> John   W0UN
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