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TimeSource 3100 33
Engineering and Ordering
097-72020-01 Issue 9: November 2003
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Due to the geometry of the GPS satellite orbits, more satellites are visible in the direction of
the equator than the poles. If possible, place the antenna so that the antenna has a clear view
toward the equator (toward the south in the northern hemisphere, or toward the north in the
southern hemisphere). Up to 60 degrees of arc, centered at the pole, may be blocked with
little effect in the temperate latitudes. This note is less applicable in latitudes nearer the
equator.
The total of obstructions above the mask angle should not obscure more than 25 percent of
the total field of view (90 degrees of azimuth) (Figure 7).
Figure 7. Antenna Location Examples
Notes:
1. Place the antenna high enough on the tower that obstructions are below the mask angle;
mount the antenna more than 1 meter away from the tower, and far below the
interference of the antennas at the top of the tower. Tower mounting is the least desirable
location because of the potential for severe multipath, and difficulty in troubleshooting
and maintenance.
2. Place the antenna high enough that the roof structure and tree are below the mask angle,
and the water tower does not block a large portion of the sky.
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