Installation Manual

3-20 Installation
MK-MAN-01 CarrierWave Digital Radio
Figure 3-11. CarrierWave ODU with Mounted Tilt Bracket
3.6.3 Routing the ODU/IDU Interconnect Cable
1. Select where the cable will enter the building from outside.
2. Determine the length of cable required. Allow three extra feet on each end to allow for strain
relief, as well as any bends and turns.
3. Route the cable.
The ODU and IDU are equipped with N-type female connectors at their interconnecting ports. A
length of coaxial cable (such as Times Microwave Systems LMR-400, LMR-300 or LMR-200)
fitted with two N-type male connectors is required to connect the ODU to the IDU. This cable
assembly may be supplied in fixed lengths with the digital radio. Bulk coaxial cable of equivalent
specification may also be used, with terminating connectors applied during cable installation.
Based on an evaluation of the cable routing path, pull the ODU/IDU Interconnect cable from one
unit to the other, utilizing cable trays, ducts, or conduit as required. Take care that the ODU/IDU
Interconnect cable is not kinked or damaged in any way during installation. Be sure to protect the
N-type connectors from stress, damage and contamination during installation (do not pull the
cable by the connectors). If multiple ODU/IDU Interconnect cables are to be installed along the
same route, the cables should all be pulled at one time. Be sure the installed cable does not
have any bends that exceed the specified cable bend radius. The ODU/IDU Interconnect cable
should be adequately supported on horizontal runs and should be restrained by hangers or ties
on vertical runs to reduce stress on the cable. Outside the building, support and restrain the
cable as required by routing and environmental conditions (wind, ice).
The CarrierWave ODU/IDU and interconnection must be properly grounded in order to protect it
and the structure it is installed on from lightning damage. This requires that the ODU, any
mounting pole or mast and any exposed interconnect cable be grounded on the outside of the
structure. The IDU must be grounded to a rack or structure ground that also has direct path to
earth ground.