SATELLITE BROADCAST RECEPTION SYSTEM AND LOW NOISE BLOCK DOWN CONVERTER AND SATELLITE BROADCAST RECEIVER USED IN SATELLITE BROADCAST RECEPTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a satellite broadcast reception system capable of connecting plural receivers. SOLUTION: The low noise block down converter (LNB) 8 is provided with a 4×2 IF switch IC 32A for receiving polarized wave signals transmitted from two satellites, selecting the polarized wave signals corresponding to the output of a control microcomputer 38A and a voltage comparator 36A and outputting them from two output ports, IF amplifiers 34A and 34B connected to the two output ports of the 4×2 IF switch IC 32A respectively, the control microcomputer 38A connected the output ports A and B and for receiving digital serial data from a receiver connected to the respective output ports and supplying the selection signals of the satellite to the 4×2 IF switch IC 32A corresponding to the digital serial data and the voltage comparator 36A connected to the output ports A and B and for receiving a DC from the respective output ports and supplying the selection signals of the polarized wave signals to the 4×2 IF switch IC 32A.