Installation Manual

User Reference and Installation Manual 3-21
CarrierWave Digital Radio MK-MAN-01
The ODU must be directly connected to a ground rod or equivalent earth ground. The ODU/IDU
interconnect cable should also be grounded at the ODU, where the cable enters the structure and
at intermediate points if the exposed cable run is long (typically at intervals of 100 ft), with the
cable manufacturer’s grounding kits. Lightning protection devices used with the interconnect
cable must be appropriate for the transmission of the interconnect signals (DC to 2.4 GHz).
Provide a sufficient but not excessive length of cable at each end to allow easy connection to the
ODU and IDU without stress or tension on the cable. Excessive cable length, especially
outdoors, should be avoided to minimize signal attenuation and provide a more robust and
reliable installation. If installing using bulk coaxial cable, terminate the ODU/IDU Interconnect
cable at each end with an N-type male connector appropriate for the cable type. Use of
connectors, tools and termination procedures specified by the cable manufacturer is
recommended.
Once the cable has been installed but before connection has been made to either unit, a simple
DC continuity test should be made to verify the integrity of the installed cable. A DC continuity
tester or digital multimeter may be used verify a lack of DC continuity between the cable center
conductor and outer conductor, with the opposite end of the cable unconnected. With a
temporary test lead or shorting adapter connected to one end of the cable, DC continuity should
be verified between the center and outer conductors at the opposite end.
3.6.3.1 Installing the ODU/IDU Interconnect Cable
1. Screw on the ODU/IDU Interconnect cable with N-type connector.
Figure 3-12. N-type Connector Location – Underside of CarrierWave ODU
2. Insert the N-type connector into the receptacle located underneath the ODU. Make sure that
the connector tab engages the slot in the receptacle.
3. Slide the grommet up the cable and press it into the bottom of the ODU.
3.6.4 Grounding the System
The CarrierWave IDU/ODU System must be properly grounded in order to protect it and the
structure it is installed on from lightning damage. This requires:
1. Grounding all the ODUs as shown in Figure 3-13.