1+1 Hsb / 1+1 Fd System; Space Diversity/Dual Antenna System - Nera Evolution Series Technical Description

3.2.

1+1 HSB / 1+1 FD system

The 1+1 HSB or 1+1 Frequency Diversity configuration, consist of an IFU basic frame, an E1 or T1
Interface Unit, two Radio Interface Units, two coaxial cables to the ODUs and two ODUs mounted on an
RF-Coupler Unit. The RF-Coupler can be asymmetrical or symmetrical, and the RF-Coupler/ODU
assembly can be mounted directly on the antenna or near the antenna. When the RF-Coupler is not
directly mounted, a short flexible waveguide is used to connect the RF-Coupler to the antenna port.
Figure 3-2 System Block Diagram 1+1 HSB/FD Terminal
3.3.

Space Diversity/Dual Antenna system

The 1+1 HSB or 1+1 Frequency Diversity configuration can be configured for Space Diversity or Dual
Antenna. This configuration uses two antennas, and the two ODUs are mounted one on each antenna
without using an RF-Coupler. The use of Space Diversity/Dual Antenna reduces the RF loss and provides
path diversity, which can improve system performance (subject to frequency band and path type and
length).
Figure 3-3 System Block Diagram Space Diversity Terminal
NGP\00329 Rev. C 23-06-2006 Evolution Series - XPAND 19