Installation Guide

Table Of Contents
TETRA MBS UNIT. INSTALLATION GUIDE
F067646PT_2801
Page 41 of 62
en
- Case 1: All MBS Units in the MBS comply with the restrictions about subband and frequency separation. In
this case, is allowed to install all the antennas in the same horizontal plane following the guidelines normally
applied for SBS sites about the horizontal distance between each antenna and the mast.
- Case 2: The restrictions about subband and frequency separation are not complied between the MBS Units
in the same MBS. In this case, the antennas installation should be done keeping an enough vertical
separation between each antenna of MBS in order to obtain the necessary isolation to avoid, when all MBS
Units are transmitting, an increase in the RSSI level respect to the level measured when the MBS Units are
not transmitting.
This option is not advisable, especially if the tower which antennas will be installed is not elevated over the
ground, because may be differences of coverage between the upper antenna and the lowest that could
affect the communications performance.