Here's two great photos of a roof mount tower, courtesy of IK4ADE:
http://www.qsl.net/ik4ade/anni90/casa_mf.jpg
http://www.qsl.net/ik4ade/anni90/antenne_mf.jpg
73s Tim EI8IC
----- Original Message -----
From: "The Linn's" <rangecon@pcisys.net>
To: <towertalk@contesting.com>
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
input.
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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