User's Manual

Radio Site Planning Hardware Installation Guide
5-4 Airspan Networks Inc. 02030311-07
5.4. Spectrum Analysis for Locating Clear
Frequencies
Before setting up your wireless link between Base Station and subscribers, Airspan
recommends (especially in unlicensed bands), analyzing the RF spectrum at the
Base Station to select only clear frequency channels (i.e. without interferences) for
building a frequency table for wireless communication between Base Station and
subscriber.
Prior to performing this test, you need to mount the radio/antenna in the desired
installation spot. In general, you will be looking for frequencies with signal strengths
of –85 dBm or greater.
For using Airspan's spectrum analyzer tool, refer to the WipConfig User's Guide. For
evaluating link quality using the Spectrum Analyzer, see Appendix E, "Evaluating
Link Quality".
5.5. Adjacent Base Station Radios
For installations involving co-location of BSRs, it is important to assign frequencies
of maximum spacing. This is to reduce possible radio interference between
adjacently installed BSRs. In addition, a 1-meter separation must exist between
adjacent BSRs.
5.6. Radio Antenna Alignment
Once the subscriber unit (i.e. SPR/IDR) is installed and aimed in the general
direction of the BSR, it is recommended to measure the received signal strength
(RSS) to determine the signal strength received from the BSR, and to precisely align
the SPR/IDR for maximum signal strength.
You need to orientate (up/down, left/right) the SPR/IDR until the maximum RSSI
levels are achieved, and then secure the SPR/IDR. For short links you can expect an
RSSI of –60 dBm or better. For longer links, an RSSI of –75 dBm is acceptable.
Any RSSI of less than –80 dBm may be too weak for the radios to reliably
communicate.