Yaesu G-450CDC User Manual

5
Rotator Unit Components and Dimensions
Tower-Mounted Antennas
In the preferred tower-mounting conguration, the antenna Wind Loading Area must be
less than 1m
2
, and the “K” factor (see below) must not exceed 100, where K = [Antenna
Turning Radius (m)] x [Antenna + Mast Weight (kg)].
Refer to the antenna manufacturer’s specication sheet for determining the turning radius
and weight of the antenna.
Example: In this example, a 50 MHz 5-element Yagi of Turning Radius 2.5 m, Weight of
7 kg,and Surface area of 0.3 m
2
is proposed for tower mounting below a 3-ele-
ment 21 MHz Yagi of Turning Radius 4.2 m, Weight of 10 kg, and Surface Area
of 0.45 m
2
. The mast weight is 5 kg.
Note: In such “Christmas Tree” installations, compute the mast weight separately for each
antenna, using the relative heights of the two antennas to apportion the mast weight.
The antenna system K factor, then, is the sum of the two antenna K factors:
K
1
= K factor of 50 MHz 5-element Yagi.
K
1
= Turning Radius (2.5 m) x Weight (4.5 kg + 2.5 kg) = 17.5
| |
Antenna Weight Mast Weight (5 kg ÷ 2)
K
2
= K factor of 21 MHz 3-element Yagi.
K
2
= Turning Radius (4.2 m) x Weight (7.5 kg + 2.5 kg) = 42.0
| |
Antenna Weight Mast Weight (5 kg ÷ 2)
K
Total
= K
1
+ K
2
= 175. + 42.0 = 59.5
The antenna system Wind Loading Area is:
0.3 m
2
+ 0.45 m
2
= 0.75 m
2
The Wind Loading Area and “K” factor are within the specifications for the G-450ADC/
-450CDC.
Table 1: Wind Loading Areas for Common Antennas (Typical)
Band
(MHz)
Elements
Area
(m
2
)
Band
(MHz)
Elements
Area
(m
2
)
7 2-element 2.2 14/21 3-element, trapped 0.4
7 1-element, w/loading coils 0.2 14/21 4-element, trapped 0.5
7 2-element, w/loading coils 0.5 21/28 4-element, trapped 0.3
7 3-element, w/loading coils 1.1 21/28 5-element, trapped 0.4
14 3-element 0.7 14/21/28 3-element, trapped 0.4
14 4-element 1.2 14/21/28 4-element, trapped 0.5
14 5-element 1.7 50 4-element 0.25
21 3-element 0.45 50 5-element 0.3
21 4-element 0.6 50 6-element 0.37
21 5-element 0.8 50 2-element, Swiss Quad 0.3
21 6-element 1.3 144 10-element 0.2
21 2-element, Swiss Quad 0.3 144 10-element, stacked 0.44
28 3-element 0.3 144 10-element, x 4 0.95
28 4-element 0.42 144 10-element, x 4 x 2 2
28 5-element 0.6 430 12-element 0.06
28 2-element, Swiss Quad 0.3 430 12-element, stacked 0.12
7/14 3-element, trapped 0.5 430 12-element, x 4 0.3
7/14 4-element, trapped 0.8 430 12-element, x 4 x 2 0.6

Yaesu G-450CDC Specifications

General

Brand	Yaesu
Model	G-450CDC
Category	Controller
Language	English