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Antenna Considerations
The types of antennas that can be attached to this product differ widely, depending on the installation method, local
terrain, and the maximum expected wind speeds at your location.
The following pages described typical antennas which are acceptable for installation with the G-800SA or G-1000SA.
The discussion below assumes maximum wind speeds of 30 meters per second, and it is recommended that you include
a safety margin of at least 40% to account for higher wind gusts or other factors which might potentially cause
damage to your installation.
Mounting of the rotator on a pole or mast results in a significant de-rating of the size of the antenna which can be
mounted, due to the tremendous bending forces applied to the rotator's clamps. For pole mounting, the product of
multiplying the [Antenna Wind Load Area (in m )] by the [Height of the Antenna Mast (in m)] must be less than 0.45.
See below Table and Figure.
[ Antenna Wind Load Area ] x [ Height of Antenna Mast ] = 0.45
Refer to the antenna manufacturer's specification sheet for determining the weight and the surface area of the proposed
antenna.
For a 14 MHz 3-element Yagi of Surface area of 0.7 m (see Table 1), the above specifications for pole
mounting will be met if the antenna is mounted on a mast not longer than 0.3 m (0.7 m x 0.3 m = 0.21
< 0.27 [ 0.45 x 40% safety margin ] .
We recommend that your antennas/mast should not exceed 60% of the maximum rating, to ensure a
safety margin.
Wind Loading Areas for Common Antennas (Typical)
Band
Elements
(MHz)
7
2-element
7
1-element, w/loading coils
7
2-element, w/loading coils
7
3-element, w/loading coils
14
3-element
14
4-element
14
5-element
21
3-element
21
4-element
21
5-element
21
6-element
21
2-element, Swiss Quad
G-800SA/G-1000SA User Manual
P
-M
OLE
OUNTED
Less than 0.3m
Optional Mast Clamp GC-038
Example of a 14 MHz Band, 3-Element Yagi Antenna
Area
Band
Elements
2
(m
)
(MHz)
2.2
28
3-element
0.2
28
4-element
0.6
28
5-element
1.1
28
2-element, Swiss Quad
0.7
7/14
3-element, trapped
1.2
7/14
4-element, trapped
1.7
14/21
3-element, trapped
0.45
14/21
4-element, trapped
0.6
21/28
3-element, trapped
0.8
21/28
4-element, trapped
1.3
14/21/28
3-element, trapped
0.3
14/21/28
4-element, trapped
A
NTENNAS
Area
Band
2
(m
)
(MHz)
0.3
50
4-element
0.42
50
5-element
0.6
50
6-element
0.3
50
2-element, Swiss Quad
0.5
144
10-element
0.8
144
10-element, stacked
0.4
144
10-element, x 4
0.5
144
10-element, x 4 x 2
0.3
430
12-element
0.4
430
12-element, stacked
0.4
430
12-element, x 4
0.5
430
12-element, x 4 x 2
Area
Elements
2
(m
)
0.25
0.3
0.37
0.3
0.2
0.44
0.95
2.0
0.06
0.12
0.3
0.6
Page 3
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