In the
preferred tower-mounting configuration, the antenna Wind Loading Area must be
less than 1 m2
(G-450A) or 2 m2
(G-650A), and the “K” factor (see below) must not exceed 100 (G-450A) or 180
(G-650A), where K = [Antenna Turning
Radius (m)] x [Antenna + Mast Weight (kg)]. Refer to the antenna
manufacturer’s specification sheet for determining the turning radius and
weight of the antenna
Example: In this example, a 14 MHz 3-element
Yagi of Turning Radius 7.5 m ,
Weight of 14 kg ,
and Surface area of 0.7 m2
is proposed for tower mounting below a 3-element 21/28 MHz trapped Yagi of
Turning Radius 3.5 m ,
Weight of 13 kg ,
and Surface Area of 0.3 m2
. The mast weight is 5
kg .
K1 = K
factor of 14 MHz 3-element Yagi.
K1 =
Turning Radius (7.5 m )
X Weight (14 kg
+ 2.5 kg )
= 123.75
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Antenna Weight Mast Weight (5 kg ÷ 2)
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Antenna Weight Mast Weight (5 kg ÷ 2)
Refer to the antenna manufacturer’s specification sheet for determining the weight and the surface area of the proposed antenna.