Chapter 1 Overview of the TimeSource 3100
Functional Description
30 TimeSource 3100 User’s Guide 097-72020-01 Revision K – December 2005
At time of installation, marginal or unacceptable TFOM readings can indicate the
need to adjust the antenna placement, the mask angle, and/or the location data.
Relatively small changes in the antenna placement can improve the ability of the
system to see satellites and therefore improve performance. The mask angle can
be adjusted to block out lower elevation portions of the sky if there is good visibility
at higher elevations, thereby reducing multipath. Correct location data is very
helpful in identifying and tracking satellites.
In addition, a clock may be stable for many weeks, months, or years but could
degrade because of changes in its environment. TFOM is useful in detecting these
infrequent subtle changes including:
Maturing foliage or seasonal foliage changes
Installation of new transmitters nearby (i.e. wireless base station)
New building construction
Variations in the day-to-day temperature of the CO
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