AN/ GSC-39( V)

The AN/ GSC-39( V) 1 is the standard DSCS medium terminal (MT) for fixed sites. The AN/GSC-39 differs from the AN/FSC-78 18.29 m (60 ft) dish only in using an 11.6 m (38 ft) diameter, DE-222/G, parabolic dish.

The AN/ GSC-39( V) 2 is designed for transportable requirements. With the exception of the interface hardware, all major components are fully interchangeable between the (V) 1 and (V) 2 versions. Designed to operate within the SHF X-band spectrum, the AN/ GSC-39( V) is a multiple carrier, 500-MHz instantaneous bandwidth terminal. The heart of the communications equipment features wideband access at 70 and 700 MHz IF to accommodate both analog and digital interfaces. The antenna subsystem consists of a 38-foot, high-efficiency reflector and a pedestal housing the drive mechanisms. It is a Cassegrain feed system with a five horn pseudomonopulse antenna that can be dismantled and stored in reusable containers for rapid deployment. Receive LNAs installed in a redundant configuration are physically mounted at the base of the feed horn on the rear of the antenna and have a maximum noise temperature of 30 degrees Kelvin (K). The LNA provides a signal gain of 53 dBm and has 15 down-converters. The transmit side has nine up-converters and two TWTAs with an output of five kilowatts (kW) each. A switch combining network permits the power amplifiers to operate in a redundant or parallel configuration. The parallel configuration combines the power output of the transmitters at 10 kW.

Shore SHF SATCOM System Block Diagram

Sources and Resources

• CHAPTER 2 SYSTEM DESCRIPTION NTP 2 NAVAL TELECOMMUNICATIONS PROCEDURES NAVY SUPER HIGH FREQUENCY SATELLITE COMMUNICATIONS