Symmetricom Time Server Manual Do Utilizador

Chapter 2: Installation and Start-Up

extend mast height to prevent multipath cancellation.  The 
antenna should be at least 3.28 ft (1.0 m) from a reflecting 
surface.  The figure at the right

 

shows the recommended 

mounting of the antenna to the mast.

The GPS Window-Mounted Antenna is intended 
for use with products featuring ‘single satellite 
timing,’ (available with firmware version 8 and 
above). Customers with units running earlier 
firmware versions should upgrade to the current 
version. Information on upgrading is available at 

.

Window mounted antennas have a restricted view 
of the sky, yielding intermittent satellite coverage. 
With single satellite timing, a network time server can synchronize with individual GPS 
satellites as they pass through the antenna’s field of view. 

Select the window with the best unobstructed view of the sky. For equivalent views, select 
the window with the best orientation. The orientations, in order of preference, are as 
follows: 

1. Equator-facing (e.g., South, for users in the Northern hemisphere.) 
2. East/West-facing 
3. Polar-facing (e.g., North, for users in the Northern hemisphere.)

Note: Regardless of orientation, use the window with the best view of the sky.

Mount the antenna on the lower part of the window, where it has the best upward 
visibility, by pressing the suction cup onto the window. Make sure the window and suction 
cup surfaces are clean. Note that some windows have metallic glazing that  blocks GPS 
signals: this prevents GPS receivers from tracking satellites and determining the time.

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