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Figure 2-7.—Satellite communications systems | Up
Information Systems Technician Training Series, Module 4 - Communications Hardware | Next
Figure 2-10.—AN/WSC-5 UHF Transceiver |
Figure 2-8.—AN/SSR-1 receiver system.
megahertz (MHz) intermediate frequency (IF) to the
desired radio frequency. The signal is then passed to the
HPA or MPA and amplified to its authorized power
level. During receive operations, the LNA amplifies the
received RF signal and sends it to the tracking converter
for antenna control and the down-converter for
translation to 70 or 700 MHz IF. This signal is then sent
to the modem for conversion to digital data. System
frequency stability is provided by a cesium or rubidium
standard.
FLEET BROADCAST SUBSYSTEM
EQUIPMENT
The SATCOM equipments that the Navy uses for
the fleet broadcast include the SATCOM broadcast
receiver (AN/SSR-1), the FLTSATCOM SHF
broadcast transmitter (AN/FSC-79), the standard
shipboard transceiver (AN/WSC-3), the shore station
transceiver (AN/WSC-5), and the basic airborne
transceiver (AN/ARC-143B). A brief description of
these equipments is given in the next paragraphs.
The AN/SSR-1 is the Navy’s standard SATCOM
broadcast receiver system. This system consists of up to
four AS-2815/SSR-1 antennas with an AM-6534/SSR-
1 Amplifier-Converter for each antenna, an MD-900/
SSR-1 Combiner-Demodulator, and a TD-1063/SSR-1
Demultiplexer (figure 2-8). The antennas are designed
to receive transmissions at 240 to 315 MHz. The
antennas and antenna converters are mounted above
deck so that at least one antenna is always in view of the
satellite. The combiner-demodulator and
demultiplexer are mounted below deck.
The AN/FSC-79 Fleet Broadcast Terminal (figure
2-9) interfaces the communications subsystems and the
satellite. The terminal provides the SHF uplink for the
Figure 2-9.—AN/FSC-79 Fleet Broadcast Terminal.
2-9
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