Intraplant communication system

Details Intraplant communication system Intraplant communication system

1978-06-19

1980-06-03

Morrison, Malcolm A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

179159, 455 89, H04M 100

Patent

active

042063183

ABSTRACT:
This invention is an improvement of the intraplant communication system in U.S. Pat. No. 3,527,890. It comprises one base unit composed of a handset amplifier and speaker amplifier, each with its own integral power supply and each located on a common printed circuit board. This unit also features a disconnect device, formerly called a hook switch, which includes a radio frequency proximity detector which has no moving parts.

REFERENCES:
patent: 2673252 (1954-03-01), Henrikson
patent: 3489860 (1970-01-01), Greenman et al.
patent: 3527890 (1970-09-01), Radomski
patent: 3573620 (1971-04-01), Ashley
patent: 4079201 (1978-03-01), Scott et al.

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