[Towertalk] Mounting multiple antennas on mast

on4kj on4kj@skynet.be
Sun, 17 Nov 2002 23:47:43 -0000


Hello Wes,

If you are not in a hurry, I'll try to explain how I fixed the problem here
recently.
But I have to prepare the description, as english isn,t my mother tongue.
With a drawing it would be easier, unfortunately its not possible here.
Roughly, I putted my rotor at 5 meter from ground level, the tower is 21
meter. The whole system works  as a lift with a counter weight  equal the
complete antenna gear weight  less the beam who sites on the top of the
tower when jobbing on top. So the climber can lower  and lift the antennas
with only one hand.
I have a 5 elements fritzell fb-dx 506 just a couple of inches  of top. A 4
meter mast goes out of the tower with a 4 ele 50 Mc/s beam and a vertical on
top for VHF/UHF.
Jos on4kj



----- Original Message -----
From: "Wes Cosand" <wz7i@arrl.net>
To: <towertalk@contesting.com>
Sent: Sunday, November 17, 2002 10:43 PM
Subject: [Towertalk] Mounting multiple antennas on mast


> I'm have not seen much discussion of an topic that worries me.  I'm not
> certain I am using "best practices".
>
> How do most folks go about mounting multiple antennas on a mast?    Here
is
> my technique.  Is there a better procedure?
>
> I erect the tower with a rotor shelf and two thrust bearing shelves with
> the mast inserted through the three shelves without the rotor.  Then  I
> mount and tune the top beam on the mast.  Then I use a small "come along"
> hoist between the top shelf and a U-bolt low on the mast to raise the mast
> before clamping the thrust bearings in preparation to mount the second
> beam.  The two thrust bearings keep the mast from getting away from me
> while I mount the rotor.
>
> Is this the way everyone does it?
>
> Wes WZ7I
> _____________________
> Wes Cosand, PhD
> 6299 Durham Rd; Rt 413
> PO Box 349
> Pipersville, PA 18947-0349
> Email: wz7i@arrl.net
> Phone: 215-766-3842
> FAX:   215-766-3843
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