Portable radio set with a carrying holder

Details Portable radio set with a carrying holder Portable radio set with a carrying holder

1980-07-25

1982-04-13

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 95, 455346, 455351, H04B 140, H04B 120

Patent

active

043251420

ABSTRACT:
A switch and an actuator therefore are arranged, respectively, on the portable radio unit and the carrying holder therefore in a manner such that, when the radio unit is inserted in the carrying holder, the switch is actuated to disconnect the microphone-speaker built in the radio unit or left intact, depending upon whether the radio unit is inserted with its grilled face directed backward or forward. With such arrangement, any unwanted increase in power consumption of the speaker circuit of the receiver or noise intrusion to the microphone circuit of the transmitter can be avoided even when an external microphone-speaker is connected to the radio unit. The built-in microphone-speaker can be used even in cases where the radio is carried on a person as at his waist.

REFERENCES:
patent: 3103630 (1963-09-01), Pitts
patent: 3134945 (1964-05-01), Wertheimer
patent: 3720874 (1973-03-01), Gorcik
patent: 4046973 (1977-09-01), Sato
patent: 4107611 (1978-08-01), Holcomb
The All Transistor Portable Car Radio: 1956, by W. C. Sahm, Radio and TV News, Jan. 1959, pp. 62-63.

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