Method and electronic control device for radio telephone communi

Details Method and electronic control device for radio telephone communi Method and electronic control device for radio telephone communi

1976-05-07

1978-07-18

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

179 2EB, 325 64, 343177, H04B 360, H04B 504

Patent

active

041018354

ABSTRACT:
An electronic control device interfaces a duplexed frequency radio communications system with an ordinary telephone set to enable two-way communication between mobile two-way radios and land line telephones. In response to an enabling signal transmitted from a mobile radio unit, the electronic interface device automatically connects an associated base station radio with outgoing telephone lines thereby allowing the operator of the mobile radio to direct dial a land-line telephone using an encoder device associated with the mobile radio unit. In response to a disabling signal, initiated by either the mobile unit operator or a land-line party, the interface device functions to automatically disconnect the telephone line from the base station radio, thereby terminating the call. Alternatively, a timing circuit likewise terminates the call after a preselected time following transmission of the last communication. The ordinary ringing signal produced by an incoming telephone call to the base station may be relayed by means of the interface device to the mobile unit operator who may respond thereto by transmitting the enabling signal to the interface device which causes the call to be answered and placed through to the mobile unit. Optionally, the land-line calling party may transmit a coded enabling signal to effect the placement of the call through to the mobile unit.

REFERENCES:
patent: 2722598 (1955-11-01), McDonald
patent: 3065421 (1962-11-01), Hart
patent: 3193623 (1965-07-01), Burns et al.
patent: 3586978 (1971-06-01), Van Gorder

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