Installation Manual Part 2

PRELIMINARY
6-7
BWX 8415 Basestation Installation and Commissioning Guide
OL-19519-01
Chapter 6 Installation
6.3.2 Install the GPS Antenna Cable
6.3.1.1 Channel Filters
In the BWX 8415 Basestation you have the option to:
• 1 - Use a Channel filter:
The functions of Channel filters are two-fold: (1) to shape the power amplifier out-of-band emission
during transmission in order to meet FCC or other regulatory requirements; and (2) to provide high
rejection for close-in jammers during the receive period. The latter improves receiver selectivity. As
indicated by its name, the filter operates in a specific limited frequency band (e.g., Bandwidth (BW)
= 5 to 20 MHz) and has more stringent attenuation requirements. Normally, the attenuation is 15-20
dB rejection for close-in frequencies.
If a BWX 8415 Basestation has channel filters installed, it must be operated at a center frequency
that exactly matches the center frequency for which the channel filters were manufactured;
otherwise, the equipment could be damaged.
• 2 - Not use a filter at all:
If no channel filters are installed, the service provider is free to select or change the center frequency of
the BS without damaging the equipment.
Note Depending on the country where the system is being used, a channel filter may be required to meet the
spectrum requirements of that region. A consideration to keep in mind when addressing a deployment
for a specific region.
If the channel filters do not come installed and you have to install them, please refer to Appendix E,
“BWX 8415 Channel Filter Installation Procedure”, for the procedure to install the filters.
Note If channel filters are required to be installed, after the BWX 8415 Basestation has been installed on the
tower or building, the basestation will need to be lowered to the ground.
6.3.2 Install the GPS Antenna Cable
Connect the GPS cable to the GPS antenna, located at the top of the BWX 8415 BS and tighten the
connector to 12 to 15 in-lbs. (1.4 to 1.7 Nm). Refer to
Figure 6-7.
Note In the event that the BWX 8415 BS is mounted on the side of a building, the GPS antenna can be removed
from the BS and mounted to a location where the antenna will have a clear 360° view of the sky. The
GPS cable loss must be less than 8 dB.