User Manual

November 1999
2-10 M68333 Rev. A Tel-Link PMP - Sector Terminal Installation & Maintenance Manual
2.5 IF Cable Run
A single coaxial cable is used to connect the sector ODU to the Basic IDU chassis. This carries the transmit
IF signal, receive IF signal, telemetry, 10 MHz Reference Signal and DC Power between the IDU Chassis
and Sector ODU. The IDU chassis and ODU contain “N” type female connectors for interconnection of the
coaxial cable. The DC power for the ODU is supplied to the Basic IDU chassis from the rack mounted ODU
Power Supply chassis.
Double-screened LMR-400 coaxial cable is recommended for its good EMC performance and possess the
following characteristics described in Table 2-1:
Table 2-1 - LMR-400 Performance Characteristics
Property LMR-400
Shielding > 90 dB
Impedance 50 Ohms
Velocity 85%
Capacitance 2.39 pF/ft
Center Conductor 0.109” (0.28 cm)
Attenuation (25°)
30 MHz 0.70 dB/100 ft
220 MHz 1.80 dB/100 ft
450 MHz 2.7 dB/100 ft
900 MHz 3.90 dB/100 ft
Phase Stability +/- 10 ppm/deg C
DC Resistance 1.39 Ohms/1000 ft
Bend Radius 1” (2.54 cm)
Temperature Range -40°F to 185°F (-40°C to 85°C)
Maximum Length 1000 Feet (300 meters)
IF Connector Type N Male