User's Manual

Installation
41
Before installing an outdoor unit a test ST should be used to check that the ST has sufficient
fade margin and is able to deliver the target quality of service. The test outdoor unit is usually
mounted on a telescopic pole and powered from a vehicle battery a drop cable connects to
the SIU and the outdoor unit is pointed in the direction of the CT .Place the outdoor unit up
against the building at the position where the outdoor unit is to be fixed and slowly pan the
outdoor unit though the path of the CT until a signal is received. Check that the ST can
acquire a link and that a make a test call over the system.
Check for both way transmission and absence of noise and interference. If there are any
problems with the reception and quality of the call then reposition the outdoor unit and repeat
the process until a viable location is found.
Outdoor Unit Positioning
The mounting should be solid and firm, and the outdoor unit placed in a position where
objects will not move in front of it, e.g. seasonal variations for trees (leaves, snow covering,
growth), people walking across roofs, tall vehicles driving past, a new building being
constructed in the line of sight, etc.
Inspect the suitability of the wall structure for the installation position of the outdoor unit
mounting.
Typical acceptable structures are:-
• Secure brick walls
• Concrete cladding covered building blocks
• Metal / wooden pole, with suitable bracket.
Check how the drop cable is to enter the site and the internal drop cable run from the antenna
to the internal SIU.
Before commencing with the installation, confirm with the customer the following:-
• Suitability of the outdoor unit position.
• Entry point of the drop cable to the site. Keep the drop cable short: As the I/F
frequencies are attenuated by the drop cable, any significant unused length should be
cut off before termination. Also, use low loss drop cable for potentially marginal
installations.
• Internal cable run from entry point to the SIU.