Yaesu G-1000DXC Bedienungsanleitung Seite 9

Antenna Considerations
In the preferred tower-mounting configuration, the antenna Wind Loading Area must be less than 2.2 m
2
or 3 m (G-2800DXC), and the "K" factor (see below) must not exceed 230 (G-1000DXC) or 950 (G-2800DXC),
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.
In this example, mount the following antennas stacked on a 6 kg mast.
Example
(1) 14/21/28 MHz 5-element Yagi of Turning Radius 5.6 m, Weight of 26 kg, and Surface area 0.7 m
(2) 18 MHz 3-element Yagi of Turning Radius 5.0 m, Weight of 14 kg, and Surface area 0.7 m
(3) 50 MHz 5-element Yagi of Turning Radius 2.6 m, Weight of 4.5 kg, and Surface area 0.3 m
Note: In such "Christmas Tree" installations, compute the mast weight separately for each antenna, using the relative
heights of the antennas to apportion the mast weight.
The antenna system K factor, then, is the sum of the three antenna K factors:
1
K = K factor of 14/21/28 MHz 5-element Yagi.
K 1
= Turning Radius (5.6 m) x Weight (26 kg + 2 kg) = 156.8
K 2 = K factor of 18 MHz 3-element Yagi.
2
K = Turning Radius (5.0 m) x Weight (14 kg + 2 kg) = 80
3
K = K factor of 50 MHz 5-element Yagi.
K 3
= Turning Radius (2.6 m) x Weight (5 kg + 2 kg) = 18.2
K TOTAL = K 1 + K 2 + K 3
= 156.8 + 80 + 18.2 = 255
The antenna system Wind Loading Area is: 0.7 m + 0.7 m + 0.3 m = 1.7 m
The Wind Loading Area (1.7 m ) is within the specifications for both the G-1000DXC and G-2800DXC, but the net K
factor (255) can only be met by the G-2800DXC. Therefore, the above antenna system should only be mounted using
a G-2800DXC.
We recommend that your antennas/mast should not exceed 60% of the maximum rating, to ensure a
Advice
safety margin.
G-1000DXC/-2800DXC User Manual
T -M
OWER OUNTED
Antenna Weight Mast Weight (6 kg/3)
Antenna Weight Mast Weight (6 kg/3)
Antenna Weight Mast Weight (6 kg/3)
A
NTENNAS
Mast Bearing GS-065 (option)
Note: Installation of a Thrust Bearing such as
the GS-065 does not allow the elimination of the
mast weight from the K-factor calculations above.
2
(G-1000DXC)
Page 7