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34 TimeSource 3100
Engineering and Ordering
097-72020-01 Issue 9: November 2003
No single obstruction should block a large portion (45 degrees of azimuth) of the view.
The most important obstructions are within 400 meters of the antenna. Obstructions may
include, but are not limited to, towers, buildings, other construction, trees, and high-voltage
power lines.
Attempt to avoid locating the antenna within 30 degrees azimuth of the transmission
direction of any transmitting antenna in the area, even if the transmitting antenna operates at
a different frequency. A transmitting antenna may cause the GPS antenna to become
overloaded and reduce its reception capabilities.
The minimum horizontal distance from other receiving antennas is 1 meter.
To reduce multipath signal distortions, the minimum horizontal distance from vertical
reflective structures (e.g. heating ducts, equipment housings, etc.) is twice the height of the
structure, and no less than 3 meters (see Figure 8).
Do not locate the antenna underneath high power lines. If this cannot be avoided, ensure the
antenna is placed at least twice as far from the power line as the power line is high (to avoid
danger to personnel or multipath effects).
Figure 8. Sample Rooftop Antenna Mount
Note: This is an example only. Not all parts are available from Symmetricom.
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