[TowerTalk] Antennas on a crank-up

Steve Weisbrod sweisbrod@prodigy.net
Wed, 15 Apr 1998 08:58:39 -0500

Hi Mitch
I have a similar set up with a EF320 on the bottom which is not near the
wind load of the magnum combo. My 4BA is 11 feet above the EF320. They are
on a 50ft guyed Glen Martin Eng. Al tower with a Hazer tram system to bring
the antenna system up and down the tower.  I think my weakest link is the
mast and with 6061T6 .250 wall Al I think I'm good to 70mph. I used K7LXC
Steve's mast calculating program. The tower is in a woods with large oak
trees all around so while they offer wind protection one of them might fall
and take the whole mess with it. I chose to go with this set up because of
turning radius and ease of working on it and how it fit my property. I am
very pleased with the performance.  I don't know which crank up you are
considering or where you live but I would guess you will be overloading it
if it is left cranked up.

73 Steve W8GAZ

-----Original Message-----
To: towertalk@contesting.com <towertalk@contesting.com>
Date: Wednesday, April 15, 1998 8:59 AM
Subject: [TowerTalk] Antennas on a crank-up

>Hi, Gents:
>I am getting set to put up a 100' aluminum crank-up tower.  On the top,
>at 100' I plan to put a Force 12 Magnum 620/340.  Up from that, about 8
>feet -- will go a Force 12 4BA.  I chose these antennas because of the
>decreased wind loading, as I am (still) a little nervous about having
>those up at the tippy top swayin' in the breeze with no guy
>wires....this is my first attempt with a crank-up tower.
>73 and best regards,
>Mitch Alexander  KG9DB
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