DESIGN OF DIRECT BROADCAST SATELLITE TV RECEIVER SUB-SYSTEMS

Abstract

TV has become., a powerful medium of mass communication by use of satellite technology. It has become possible to have international programs with global coverage by linking national TV systems through -satellite communication system.,'Satellite can be used for distributing the national programs over extended region in the countries with no shadow zone and multipath ghost problem. Direct Reception of Satellite TV signal is the only possibility in areas remote from terrestrial broadcast trans. -mitter, The cost of direct reception is high even with the high power satellite transmission, because of special antenna to receive the signal and frontend converter unit to modify the signals into standard broadcast standards. This dissertation deals with the design and fabrication of the various subs-systems of Direct Broadcast Satellite .TV receiver for INSAT..1B. The dissertation starts with an intro-duction to various sub-systems such as paraboloidal antenna,. low noise amplifier, miter and the wide-band FM demodulator. We next consider the design and fabrication of 2m and 4m paraboloidal antennas with its feed for the direct reception of TV signals from INSAT..lB. The design of the IF amplifier and wide-band FM demodulators have been presented next. The radiation characteristics of 2m and 4m paraboloidal antennas have also been presented.