Multichannel radio telephone system

Details Multichannel radio telephone system Multichannel radio telephone system

1979-12-03

1981-07-28

Bookbinder, Marc E.

Telecommunications

Transmitter and receiver at separate stations

179 2EB, 455 50, 455 54, 455 62, H04B 360

Patent

active

042814138

ABSTRACT:
Phantom signals resulting from intermodulation between a busy channel and an idle channel with idle tone cause scanning radio stations to lock on a phantom idle channel and miss communications. Locking on a phantom idle channel is prevented by transmitting a busy tone on each channel having communication so that any phantom signals resulting from intermodulation will include busy tone. A scanning station is arranged to lock on a channel with only idle tone, and not lock on any channel (real or phantom) with busy tone.

REFERENCES:
patent: 2694140 (1954-11-01), Gilman et al.
patent: 3571519 (1971-03-01), Tsimbidis
patent: 3581013 (1971-05-01), Muller
patent: 3634627 (1972-01-01), Valentini
patent: 4166927 (1979-09-01), Hamaoki

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