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AZIMUTH ANGLE REFERRED TO TRUE NORTH (FOR SITE IN NORTHERN HEMISHPERE)
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Figure 2-3. Universal Azimuth-Elevation Look Angles for Negative Differences
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42S042D
10
175
170 165
160 155
150
145
140
10
20
30
40
NEGATIVE DIFFERENCE BETWEEN SATELLITE AND SITE LONGITUDES
a.
b.
c.
d.
For reference, elevation is measured up from the horizon and
azimuth is measured clockwise from the North.
SERIES 8060 6-METER EARTH STATION ANTENNA
ANTENNA SITE SELECTION (120° AND 180° ANTENNA)
5
0
135
130
125 120
115
110
105
100
50
60
70
Along the bottom edge of the graph, mark the point
corresponding to the difference number obtained in step 3. In
the example above, the point is 46.6°.
Along the right edge of the graph, mark the point corresponding
to the selected antenna site latitude (determined in step 1). The
example point is 33.7°.
As shown in Figure 2-2 (by the example) project these two points
upward (from the bottom edge of the graph) and inward (from
the right edge of the graph) until these two lines intersect. Mark
this point with a circle for reference.
To determine the elevation aiming coordinate for the antenna,
follow the curved lines around to the left and estimate where the
reference point determined in (b) above would intersect the left
edge of the graph. The example is about 27°.
NOTE
95
70
60
50
LATITUDE
LIMITS OF
40
CONTIGUOUS
UNITED STATES
30
20
10
80
90
13601
2-5
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