Chapter 2 Engineering & Ordering
Site Survey
32 TimeSource 3100 User’s Guide 097-72020-01 Revision K – December 2005
Site Survey
Perform a site survey as described below before ordering the system. Use the
guidelines and considerations in the Antenna Location Guidelines section and the
Shelf Considerations section.
1. Determine the shelf location.
2. Determine the best location for mounting the antenna (less than 305 m of cable
from the shelf). Use the guidelines and considerations in Antenna Location
Guidelines, on page 33.
3. Determine the location of the grounding point for the lightning suppressor, then
determine the location of the lightning suppressor. The cable length between the
lightning suppressor and the grounding point must be less than 4.6 m. If the
grounding point is inside the building, the cable length between the grounding
point and the cable entry must be less than 15 m. Valid lightning suppressor
grounding points are as follows:
– Valid roof ring ground system (usually for roof-mounted lightning
suppressors)
– Structural steel of building (for interior-mounted or exterior mounted
lightning suppressors, attach with a cad weld)
– Central Office ground plate (usually for interior-mounted lightning
suppressors)
4. Two lengths of cable are required. Plan the cable route and measure the length
of cable required between the antenna and the lightning suppressor, and
between the lightning suppressor and the shelf.
5. Determine the two separate –48 V power sources for the shelf. If only one –48 V
power source is available, it must be cabled to both TimeSource 3100 power
inputs.
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