Installation Manual Part 5

PRELIMINARY
D-9
BWX 8415 Basestation Installation and Commissioning Guide
OL-19519-01
Appendix D RF Center Frequency and Interference Analysis Guidelines
Spectrum Analyzer Settings
Test Configurations
There are two configuration scenarios used for interference testing:
• Pre-installation Testing Configuration
• Post-installation Testing Configuration
Pre-installation Testing covers the initial equipment configurations when testing for interference at a site
in order to determine whether or not the site is a good candidate for placing the BS. It describes the
interference measurements prior to the installation of any BS equipment. The Post installation Testing
section covers the measurements using the BWX Basestation Antenna after it has been installed on the
radio tower or building. Use whichever configuration setting is appropriate to the type of data you are
trying to collect, prior to performing the Interference Sweep procedure.
Pre-installation Test
Following is the setup of the interference test equipment prior to the installation of the BS equipment.
This test is used to help determine if the site that has been selected is usable for the Cisco equipment,
and what possible frequencies can be used after the installation.
Required Equipment
• Spectrum Analyzer (4404 or R&S FSH)
• Testing antenna
• RF cable
• LNA as required
Setup
Refer to Figure D-8 for the setup. The Test antenna on the tower is at the proposed installation elevation
for the BWX Basestation Antenna. The RF cable will run from the Test antenna to the Low Noise
Amplifier (LNA) or Spectrum Analyzer. The LNA may be required in order to add gain to the system to
compensate for any losses that are added to the test by the RF cable or Spectrum Analyzer. The typical
loss for a Spectrum Analyzer is around 30 dB. The RF cable losses will vary depending on the size and
type of cable and on the length of the cable. In the example below, the total system loss would be 39 dB.
Example:
- Antenna Gain: 0 dB
- Cable Loss: 9 dB
- Loss in Spectrum Analyzer: 30 dB