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Appendix C: Setting Antenna
Parameters
C.1 Antenna Issues
Before proceeding to antenna installation details, the following background information
should be considered:
C.2 About Single and Dual Antennas
Each RADWIN 2000+ Series ODU is made of two radio transceivers (radios). The radios make
use of algorithms that utilize both Spatial Multiplexing and Diversity resulting in enhanced
capacity, range and link availability. The number of antennas used is determined by user
configuration and by automatic system decisions, explained below.
C.2.1 Dual Antennas at the RT‐A(HBS) and RT‐B(HSU)
When using dual antennas at both sites (single bipolar antenna or two unipolar antennas) you
can choose between Spatial Multiplexing Mode and Diversity Mode.
Spatial Multiplexing Mode
Under this mode, the system doubles the link capacity. At the same time, it keeps the same
rate and modulation per radio as was used with single antenna, thus increasing capacity,
range and availability.
For example, at 80MHz CBW, using a dual antenna, a RADWIN 2000 D+ radio unit can transmit
at modulation of 256QAM and FEC of 5/6 and get an air rate of 866.7 Mbps, compared to
433.3 Mbps with single antenna.
To work in this mode, each antenna port must be connected to an antenna, the RSS level in
both receivers should be balanced and a minimal separation between the antennas must be
maintained. (For example, by using dual polarization antennas a cross polarization separation
is attained).
RADWIN 2000+ Series User Manual
Release 4.2.40
C‐1
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