Airspan AS3010, Hardware Installation Manual

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Radio Site Plannin g Hardw are Insta llatio n Guide
5-10 Airspan Networks Inc. 02030311-10
Airspan offers various tools for measuring RSS (check with your Airspan
representative regarding cost and supply):
„ SPR:
„
RSS LED adapter (see Part II, Chapter 17, "Antenna Alignment using RSS
LED Adapter")
„
WipConfig program (see Appendix G, "Evaluating Link Quality")
„ IDR: built-in RSSI LEDs (see Part III, Chapter 24, " Antenna Alignment Using
RSS LEDs")
5.8. Antenna Polarization Usage
The ASWipLL radios provide integral antennas or optional third-party external
antennas. Depending on radio model, these antennas provide horizontal wave
polarization (H-pol), vertical wave polarization (V-pol), or both. The usage of these
polarization options depend on the environment in which the radio is operating.
Horizontal polarized waves reflect better from horizontal surfaces (e.g. ground),
while V-pol waves reflect better from vertical surfaces (e.g. building walls).
This explains why broadcast television uses H-pol waves while cellular technologies
use V-pol waves. Therefore, it is expected that in rural areas H-pol will propagate
better than V-pol, and vice versa in urban areas.
Furthermore, in an area saturated with interference generated from V-pol
transmitters, the use of H-pol antenna may substantially improve the C/I (Carrier to
Interference) ratio, thus improving system performance