Figure 2-11.—AN/ARC-143 UHF Transceiver.
can be used to transmit or receive voice or data in the
255.0- to 399.99-MHz frequency range.
The systems discussed are only a few of the
SATCOM equipments used by the Navy. Some of the
references listed in Appendix III of this module are
excellent sources for more information on satellite
equipment and systems.
FLEET SATELLITE
COMMUNICATIONS SYSTEM AND
SUBSYSTEMS
The Fleet Satellite Communications
(FLTSATCOM) system and subsystems provide
communications links, via satellite, between shore
commands and mobile units. The system includes RF
terminals, subscriber subsystems, training,
documentation, and logistic support. Within each
satellite, the RF channels available for use have been
distributed between the Navy and the Air Force.
Equipments in support of the FLTSATCOM system
are on ships, submarines, aircraft, and at shore stations.
These equipment installations vary in size and
complexity. Furthermore, with the exception of voice
communications, the system applies the technology of
processor- (computer-) controlled RF links and uses the
assistance of processors in message traffic preparation
and handling.
Although any part of the FLTSATCOM system can
be operated as a separate module, system integration
provides connections for message traffic and voice
communications to DOD communications networks.
A backup capability that can be used in the event of
an outage or equipment failure is provided for both
shore and afloat commands. All subsystems have some
form of backup mode, either from backup equipment
and/or systems, facilities, or RF channels. This
capability is built in as part of the system design and
may limit the ability of selected FLTSATCOM systems
to process information.
FLEET SATELLITE BROADCAST (FSB)
SUBSYSTEM
The Fleet Satellite Broadcast (FSB) subsystem is an
expansion of fleet broadcast transmissions that
historically have been the central communications
medium for operating naval units. The FSB transmits
messages, weather information, and intelligence data to
ships. The shore terminal transmits this data on a direct
SHF signal to a satellite, where the signal is translated to
UHF and downlinked. Figure 2-12 shows a standard
FSB subsystem configuration.
Figure 2-12.—Fleet Satellite Broadcast subsystem.
2-11
