Convertible half-to-full duplex radio operation selected by batt

Details Convertible half-to-full duplex radio operation selected by batt Convertible half-to-full duplex radio operation selected by batt

1991-12-23

1993-11-23

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Having particular housing or support of a transceiver

455349, 455350, 4552341, 379390, 379 58, H04B 138, H04B 108

Patent

active

052652645

ABSTRACT:
A radio or speaker-microphone unit (10) includes a radio housing (11) and a first (17") or second (17') battery housing. A speaker (33) is disposed in the radio housing (11) and two microphones (34" and 34') are disposed respectively, in the radio housing (11) and in the second battery housing (17'). The battery housings (17' and 17") are selectively attachable with the radio housing (11) to provide a selection between first and second relative positions, with one of the positions providing a handset configuration and the other providing a speaker-microphone configuration. A switch (37) senses which of the battery housings (17', 17") is attached and disables (36) the microphone (34") in the radio housing (11) if the second battery housing (17') is attached.

REFERENCES:
patent: D135540 (1943-04-01), Mitchell
patent: D300752 (1989-04-01), Soren et al.
patent: 3551607 (1970-12-01), Tommasi et al.
patent: 4018998 (1977-04-01), Wegner
patent: 4495652 (1985-01-01), Leslie
patent: 4712229 (1987-12-01), Nakamara
patent: 4715063 (1987-12-01), Haddad et al.
patent: 4845772 (1989-07-01), Metroka et al.
Mitsubishi (Pub. date Jan. 1, 1991).

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