
5-2
RF flex coaxial cable requires special consideration. The electrical char-
acteristics of the coax can be affected if it is accidentally twisted or bent.
Provide mechanical support to prevent any weight or strain to the coax
and connector when connecting or disconnecting equipment. Loosen the
connectors at both ends of a coax section if one end must be moved even
slightly. SMA connectors should be secured in place fingertight, and
then gently tightened using a torque wrench with a 5/16 in. head set for 7
to 9 inch-pounds. The connectors should not be left fingertight.
Ensure that all antennas are properly aligned and waveguide is in
good physical condition.
Before performing procedures that might in any way affect transmis-
sion, it is recommended that the person performing the procedure
understand the FCC Rules and Regulations pertaining to the equip-
ment and be properly authorized to operate the equipment.
5.2
MAINTENANCE PHILOSOPHY
This section provides information and procedures for equipment maintenance down to the
module level. Module repair is not covered in this manual. A replacement procedure for the
crystal oscillator subboard on the transmitter and receiver modules is provided to enable
future use of the local oscillator at a different frequency in another application or at
another location. Use the drawings in the appendix and those in the station drawing pack-
age to support the procedures in this section
The use of maintenance procedures in this section may result from failure of a periodic
check, an alarm indication, or unacceptable performance. These problems should normally
be resolved as shown in the maintenance philosophy flow chart (Figure 5
CAUTION
Possibility of
Service
Interruption
Note
Note
Содержание MDR-8000
Страница 2: ......
Страница 113: ...5 55...