User's Manual

14221-1200-4010, Rev. B

6.3 LOCATING COMPONENTS

Plan the mounting locations of all components (LBPA, MRU, CH-100/CH-721, antennas, cables, etc.)

and determine the routes for all wiring and cables. Particularly consider the connection of the control head

for planning purposes.

 Determine the customer’s preferences, if any, for location of components. Comply with these

preferences as long as they are consistent with safety recommendations and guidelines presented in

this manual, and other generally accepted professional radio installation practices.

 Nominal dimensions for the LBPA, MRU, and the CH-100/CH-721 are listed in Section 2.1 of this

manual (page 14). These dimensions do not include any clearance space required for cabling, air

circulation, access to mounting hardware, etc. Always plan for and include adequate clearance around

the radios.

 The LBPA and MRU must be located and mounted within approximately twelve (12) inches of each

other.

 Verify sufficient clearance behind the radios is provided so cables will not be stressed, crushed,

twisted, or bent at severe angles. Also, the front and sides must have clearance for air circulation,

access to mounting hardware, etc.

 Connections at the LBPA and MRU are made through both “pigtail” type cables exiting the rear of its

two radios, and panel-mount type connectors. This design minimizes the stresses associated with

mating connections and it allows for easy connector mating. However, stresses can still be induced if

adequate service looping is not employed. Connections to the control head is made with connectors

mounted on the rear panel of each head, instead of “pigtail” type cables.

 Antennas: The radios’ two transmit/receive antennas must be at least three (3) feet (0.92 meters)

apart. However, further antenna separation is recommended, if possible. Refer to Section 8 (page 40)

for antenna installation details.

All cables should have a service loop near each connector end. Do not bend the cables at

severe angles near the connector end. After all components are installed, verify no cable is

under any tension. Failure to do so may lead to damaged cables, causing intermittent radio

operation or complete radio failure.