User's Manual Part 1

Remote GPS Head and Cabling – continued
Jun 2004
3-9
1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU
DRAFT
Table 3-7: RGPS Pin/Signal Name Information
Pin Signal Name
6 NC
7 RGPS +28V Supply
8 RGPS +28V Supply
9 DATA – (From Head)
10 SYNC – (From Head)
11 SYNC – (To Head)
12 DATA – (To Head)
13 NC
14 RGPS Return
15 RGPS Return
RGPS Mounting
Considerations
The RGPS Head requires specific mounting considerations in order to
properly observe the GPS satellites.
S The mounting pipe for the RGPS head should be mounted vertically
with less than five degrees (5_) of tilt.
S The RGPS head mounting hardware which comes with the RGPS
head should be used in all installations. This mounting hardware
properly isolates the painted metal base of the RGPS head from other
conductive surfaces. If the metal base comes in contact with another
conductive surface, the electrical surge resistance of the RGPS head
can be significantly reduced leading to RGPS head failure.
– If the supplier of the RGPS mounting hardware cannot be used, the
installer MUST make certain that the metal base of the RGPS head
does not make contact with any conductive surface.
S Position the RGPS head to have an unobstructed view of the sky and
to minimize the chance of debris (leaves, dirt, etc.) accumulating on
the radome of the RGPS head.
S The RGPS head must have a clear view of the sky, preferably to
within ten degrees (10_) of the horizon in all directions. The total
blockage of the sky (due to buildings, mountains, etc.) should be less
than 50%.
S Place the RGPS head as far away from the BTS transmit antenna as
possible to avoid RF interference issues.
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