Patent
1977-11-14
1979-12-18
Brigance, Gerald
179 2EA, 325 64, H04M 150, H04Q 704
Patent
active
041795881
ABSTRACT:
A multi-frequency encoder unit is provided for a mobile radio transmitter which is constructed as a single unitary package comprising a keyboard, a first printed circuit board positioned adjacent to the rear face of the keyboard and which includes a switching circuit for providing connections from the individual keys of the keyboard to a row of connector pins on the first printed circuit board, a second printed circuit board containing the encoder circuit positioned adjacent to the first printed circuit board and electrically connected thereto by way of the connector pins which are received in connector holes in the second printed circuit board, and which includes a relay inside the encoder which causes the transmitter to be energized only as the pushbuttons of the keyboard are operated, and to be de-energized when the pushbuttons are not operated. A delay is provided so that when a key is operated the transmitter is energized immediately and remains energized for a predetermined time interval to permit other keys to be operated without turning the transmitter on and off. An extra column of pushbuttons may be provided for extraneous controls which do not embrace the delay, and the transmitter is turned on when such keys are operated and turns off the moment such keys are released.
REFERENCES:
patent: 3808537 (1974-04-01), Sarati et al.
patent: 3824465 (1974-07-01), Blough
patent: 3970801 (1976-07-01), Ross et al.
patent: 4053717 (1977-10-01), Snider
patent: 4087638 (1978-03-01), Hayes et al.
"Build This Pocket Data Terminal", Radio-Electronics, Jan., Feb., 1976, Charles Edwards.
Beecher Keith D.
Brigance Gerald
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