Installation Manual Part 5

PRELIMINARY
D-14
BWX 8415 Basestation Installation and Commissioning Guide
OL-19519-01
Appendix D RF Center Frequency and Interference Analysis Guidelines
Spectrum Analyzer Settings
Interference Sweep Procedure
This procedure guides you through the steps to capture the data required for the interference study. The
number of steps will change with the type of antenna you are using and the frequency band you are
investigating.
For the Panel antenna, the number of passes through the procedure is determined by the beamwidth of
the antenna. When using a Panel antenna to pick up the interference, try to change the angle or downtilt
to face a potential interference source, such as a tower or a more populated area.
A Panel antenna is used to determine where a source of interference is coming from. The beamwidth of
the Panel antenna determines the number of directions that you need to sweep. For example, if the
beamwidth of the Panel antenna is 120 degrees, then 3 passes of the procedure are necessary in order to
cover 360 degrees. Whereas, an antenna with a 30 degree beamwidth requires 12 sets of sweeps to cover
the same 360 degree area.
The smaller beamwidth requires more sweeps but gives you greater accuracy in determining the source
of the interfering signal. On each pass, the Panel antenna is moved per the beamwidth. Refer to
Figure D-11.
Figure D-11 Panel Sweep