Installation and Operation Manual

November 1999
M68334 Rev. A Tel-Link PMP - Remote Terminal Installation & Maintenance Manual 2-5
2.6 IF Cable Run
A single coaxial cable is used to connect the ODU to the Remote ATM IDU. The cable carries transmit IF
signal, receive IF signal, telemetry, 10 MHz reference signal and DC power between the IDU and ODU.
The IDU and ODU contain "N" type female connectors for interconnection of the coaxial cable.
Double screened LMR-400 coaxial cable is recommended to provide good EMC performance and possess
the following characteristics as shown 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