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[Towertalk] Tower and rotator for Force12 C3 antenna

To: <>
Subject: [Towertalk] Tower and rotator for Force12 C3 antenna
From: (Tim Makins, EI8IC)
Date: Tue, 23 Jul 2002 20:29:18 +0100
Here's two great photos of a roof mount tower, courtesy of IK4ADE:

73s Tim EI8IC

----- Original Message -----
From: "The Linn's" <>
To: <>
Sent: 23 July 2002 03:51
Subject: [Towertalk] Tower and rotator for Force12 C3 antenna

I have a Force12 C3 antenna and am currently trying to decide on the right
tower and rotator.  I would like to use the smaller roof mount tower because
it would be easier to maintain the antenna and rotator.  I am concerned that
I may be too close to the upper limits of the smaller Glen Martin roof mount
tower (RT424) given the wind speed in my area.  I would appreciate some

The wind speed for the Front Range County in Colorado is 85 mph

                         |   C3                |     RT 424       |     RT
832       |     Yaesu 405 Rotator

Wind load         |   5.5 SF           |   6.0@87mph |  8.0@87mph   |
10.7 SF

Weight              |     32lb

K factor            |   633.6ft/lb
|  723 ft/lb

Max. Ant Load |                        |      100 lb        |     120 lb

Mast torque      | <280in/lb         |

Breaking torque
|  260 ft-lb

Rotating torque
|    52 ft-lb

The rotator appears that it should handle the C3 antenna and it looks like
the RT832 tower would be a safe choice with its higher wind load rating.
But, as stated above, I would like to use the RT424.  My concern is that I
may be flirting with disaster if I go with the smaller tower with wind load
specs that are close to the antenna's and the wind speed for my county.

Any thoughts?

Jeff, WØUZ

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