Transportable Satellite Communications Terminal X-Band Receiving Facility

摘要

This report describes the effort expended on the design, development, installation and testing of a X-band receiving facility for the Transportable Satellite Communications Terminal. The prime objective of this program was to provide the required demodulation capability for voice, frequency multiplex and frequency shift keyed signals to be generated during future Air Force test programs. The equipment resulting from this program includes a phased lock demodulator assembly which is used for frequency multiplex signals requiring a modulation index of one and a frequency feedback demodulator assembly which is used for a voice channel requiring a modulation index of 20. The designed demodulators provide an extension of the FM threshold over conventional frequency demodulation techniques, by approximately 4 db for the phase lock demodulator and by 7.2 db for the frequency feedback demodulator. The total receiving facility supplies a system noise temperature of 295 K over a tuning range of 7.69 to 7.79 gc and features automatic lock and tracking for signals having doppler frequency shifts of less than = 250 kc. (Author)