Combination microphone, speaker, and control unit for a radio tr

Details Combination microphone, speaker, and control unit for a radio tr Combination microphone, speaker, and control unit for a radio tr

1975-12-22

1977-06-28

Griffin, Robert L.

325 25, 325183, 325391, 179179, H01B 138

Patent

active

040328449

ABSTRACT:
A combination microphone, loudspeaker, and control unit is disclosed which is adapted to be coupled by a multiconductor cable to a radio transceiver which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies. A multi-conductor cable is secured to a housing for the unit and is adapted to electrically connect the unit to a radio transceiver. A multi-position switch is mounted in the housing and connected to the cable, with the switch being operable to select individually the preselected frequencies. An electromechanical transducer is mounted in the housing and connected to the cable and operable to convert audible sound wave signals into corresponding audio frequency electrical signals and audio frequency electrical signals into corresponding audible sound wave signals. A transmit/receive switch is mounted on the housing and coupled to the cable and the transducer for selectively enabling the transducer to convert audible sound wave signals into corresponding audio frequency electrical signals and audio frequency electrical signals into corresponding audible sound wave signals. A volume control is mounted on the housing and coupled to the cable and the transducer for varying the amplitude of the audio frequency electrical signals applied to the transducer.

REFERENCES:
patent: 2199371 (1940-04-01), Goldsmith
patent: 3306990 (1967-02-01), Walker
patent: 3969673 (1976-07-01), Nordlof
Series 4500 UHF-FM Two Way Radio, RF Communications Div. Jan. 29, 1974.
1502 MX Hand Held, Wilson Electronics, Communications, Oct. 1975.

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