End-of-transmission keying device

Details End-of-transmission keying device End-of-transmission keying device

1990-10-01

1993-05-18

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

455 79, 455115, H04B 138

Patent

active

052128121

ABSTRACT:
A device automatically re-keys a transmitter after a transmission ceases, and thereafter transmits a preselected audio signal. The device has a key-open sensor for sensing the end of a transmission and for initiating the audio signal. A keying circuit is controlled by the sensor to re-key the transmitter. An audio sensor senses the presence of the audio signal and controls the keying circuit to un-key the transmitter when the audio signal ceases.

REFERENCES:
patent: 4082919 (1978-04-01), Day et al.

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