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 2-8.-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

^{Figure 2-9.-AN/FSC-79 Fleet Broadcast Terminal.}

FLTSATCOM system and is used in particular to support the Navy Fleet Broadcast system. The AN/FSC-79 operates in the 7- to 8-GHz band and is designed for single-channel operation. The AN/FSC-79 terminal is installed at the four COMMAREA master stations and NAVCOMTELSTA Stockton, Calif.

The AN/WSC-3 Transceiver is the standard UHF SATCOM transceiver for both submarine and surface ships. The AN/WSC-3 is capable of operating in either the satellite or line-of-sight (LOS) mode and can be controlled locally or remotely.

The unit is designed for single-channel, half-duplex operations in the 224-to 400-MHZ UHF band. It operates in 25-kHz increments, and has 20 preset channels. In the SATCOM mode, the AN/WSC-3 transmits (uplinks) in the 292.2- to 311.6-MHz bandwidth and receives (downlinks) in the 248.5- to 270.1-MHz band. A separate transceiver is required for each baseband or channel use.

The AN/WSC-5 UHF Transceiver (figure 2-10) is the common UHF RF satellite terminal installed at NAVCOMTELSTAs for the GAPFILLER subsystem. In FLTSATCOM operations, it is used as the common RF terminal for all subsystems except the Fleet Satellite Broadcast (FSB) and the Antisubmarine Warfare information Exchange Subsystem (ASWIXS). The AN/WSC-5 can be used to back up the AN/FSC-

79. The AN/WSC-5 transmits in the 248.5- to 312-MHz range and receives in the 248.5- to 270.1-MHz range.

The AN/ARC-143 UHF Transceiver (figure 2-11) is used for ASWIXS communications and is installed at VP Antisubmarine Warfare Operation Centers and aboard P-3C aircraft. The unit two parts: a transceiver and a radio set control. The AN/ARC-143

Figure 2-10.-AN/WSC-5 UHF Transceiver.

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.