Radio receiver suitable for use in a spaced carrier area coverag

Details Radio receiver suitable for use in a spaced carrier area coverag Radio receiver suitable for use in a spaced carrier area coverag

1984-05-21

1985-04-23

Bookbinder, Marc E.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 62, 455165, 455166, H04B 724, H04B 126, H03J 718

Patent

active

045134430

ABSTRACT:
A radio receiver suitable for use in a spaced carrier area coverage system in which two or more carriers are transmitted.
In order to reduce the overall noise which is present in existing systems and to enable carriers to be spaced more regularly and/or closer, the radio receiver is adapted to measure the strength of each signal, in turn, and to determine which of the received signals has the greatest strength. A local oscillator, conveniently in the form of a frequency synthesizer is adjusted so that the output frequency to the mixer of the RF section is such as to enable the signal having the greatest strength to be received. The system remains locked on to the selected signal unless or until the incoming signal decreases in amplitude by more than a predetermined amount. If this occurs, the scanning sequence is repeated to find the signal having the greatest strength, but in the event of all the signals scanned not being greater than a minimum squelch threshold value, then a squelch signal is produced which inhibits the audio frequency section of the receiver. In this latter case the receiver remains in stand-by mode.

REFERENCES:
patent: 3673499 (1972-06-01), Avins et al.
patent: 3983492 (1976-09-01), Fisher et al.
patent: 4069455 (1978-01-01), Sherman
patent: 4197500 (1980-04-01), Klein et al.
patent: 4380826 (1983-04-01), Usugi
patent: 4387469 (1983-06-01), Miyazaki et al.
patent: 4419766 (1983-12-01), Goeken et al.
patent: 4430753 (1984-02-01), Shiratani

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