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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

TECHNICAL CHARACTERISTIC VALUE
Antenna Type 38-foot Cassegrain
Feed Five horn pseudomonopulse
Pedestal Type Elevation over azimuth (EL/ AZ) kingpost
Polarization: (a) Transmit Right-hand circular
(b) Receive Left-hand circular
Frequency: (a) Transmit 7.9 to 8.4 GHz
(b) Receive 7.25 to 7.75 GHz G/ T 34 dB/ K minimum
IF Bandwidths: (a) 70 MHz - 40 MHz
(b) 700 MHz - 125 MHz
EIRP: (a) Normal Mode +119 dBm
(b) Combined Mode +122 dBm
Simultaneous RF Carriers:(a) Transmit Up to 9
(b) Receive Up to 15
Tunability 500 MHz in 1 kHz increments
Tracking Accuracy 0.03 o peak
Mean Time Between Failures (MTBF) 1,000 hours maximum
Mean Time To Repair (MTTR) 1 hour maximum

AN/ GSC-39( V) Technical Characteristics

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http://www.fas.org/spp/military/program/com/an-gsc-39.htm
Maintained by Robert Sherman
Originally created by John Pike
Updated Saturday, April 04, 1998 9:18:25 AM