Satellite receiver

Details Satellite receiver Satellite receiver

1990-10-23

1992-07-28

Kuntz, Curtis

Telecommunications

Wireless distribution system

4552341, H04B 7185

Patent

active

051347075

ABSTRACT:
Radio waves used in broadcasting and communications making use of broadcasting satellite and communication satellite are FM signals, and the frequency shift and exclusive bandwidth vary depending on the modulation signal. The satellite broadcasting receiver is designed to control the frequency shift so that the amplitude of the demodulation signal is constant, thereby making the bandwidth of the intermediate frequency filter, so as to be capable of receiving using just one filter. At this time, the frequency shift can be controlled continuously, from large to small one, in a predetermined exclusive bandwidth. When further expanding the frequency shift, since the exclusive bandwidth is extended, the noise electric power is increased and the receiving sensitivity is lowered as compared with the exclusive machine. Accordingly, when expanding the frequency shift, the noise bandwidth is narrowed in the PLL demodulator, thereby enhancing the receiving sensitivity.

REFERENCES:
patent: 4777657 (1988-10-01), Gillaspie
patent: 4910792 (1990-03-01), Takahata et al.

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