097-72020-01 Revision K – December 2005 TimeSource 3100 User’s Guide 35
Chapter 2 Engineering & Ordering
Antenna Location Guidelines
Figure 2-2. GPS Antenna Location Examples
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 2-3).
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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