Paradise Datacom 4 RU Chassis, Operation Manual

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4 RU SSPA Chassis Operations Manual 201627 REV X 77
6.4 Typical System Configuration
This section shows the 4RU Rack Mount SSPB in a common system application.
Figure 6-4
shows the Compact Outdoor used with a Teledyne Paradise Datacom
PD25 Evolution Series L-Band Modem.
6.5 IFL Cable Considerations
Consideration should be given to using a high quality IFL between the indoor and
outdoor equipment. The system designer must always consider the total cable loss for
a given length and also the implications of the slope of attenuation across the 950 to
1450 MHz bandwidth.
Table 6-3
gives the approximate attenuation vs. frequency for a
variety of cable types.
It is recommended to use a quality grade of 50 ohm cable such as Belden 9913, 9914,
or 7733. Check the manufacturer’s technical data to make sure that the insulation is
sufficient for the particular installation including the cable’s temperature range. Also
make sure the coaxial connector from the IFL cable to the amplifier input is wrapped
with a weather sealing tape to prevent water intrusion into the coaxial cable.
Cable Type Center
Conductor DC
Resistance per
1000 ft.
Outer
Diameter
(inches)
Attenuation at
950 MHz
dB per 100 ft.
Attenuation at
1450 MHz
dB per 100 ft.
Slope across
band for 100
ft. cable (dB)
Slope across
band for 300
ft. cable (dB)
RG-214 1.7 .425 7.8 11.3 3.5 10.5
Belden 8214 1.2 .403 6.8 9.2 2.4 7.2
Belden 7733 .9 .355 5.8 8.3 2.5 7.5
Belden 9914 1.2 .403 4.5 6.3 1.8 5.4
Belden 9913 .9 .403 4.2 5.6 1.4 4.2
Table 6-3: Common Coaxial Cable Characteristics
Figure 6-4: SSPB Chassis with Evolution Series Modem