Touch-tone encoder unit for mobile radio transmitter

Details Touch-tone encoder unit for mobile radio transmitter Touch-tone encoder unit for mobile radio transmitter

1976-12-20

1978-07-18

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340365S, 179 90K, H04M 150

Patent

active

041018710

ABSTRACT:
A touch-tone 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 which includes a switching circuit for providing connections from the individual pushbuttons 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 a housing attached to the keyboard and serving to sandwich the printed circuit boards between it and the keyboard in a unitary assembled condition.

REFERENCES:
patent: 3538256 (1970-11-01), Lucas
patent: 3970801 (1976-07-01), Ross
patent: 3982079 (1976-09-01), Hoehn
patent: 4012601 (1977-03-01), Kehren
Edwards, C., "Pocket Data Terminal," Jan. 76, Radio Electronics, pp. 29-31, 60, 61.

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