A selective calling system to 106A standards employing cold cathode thyratrons

A selective calling device is described which operates with the same coding signal as the 106A selector used by many Common Carrier companies. The unit is intended mainly for use in the Land and Maritime Mobile Services. It differs from existing designs in the use of cold cathode thyratrons in sequential counter circuits in place of the presently used electromechanical devices. The unit employs a printed circuit board, subminiature tubes and printed components to ensure compact construction and ease of maintenance. Cold cathode tubes are used to ensure reliability and to eliminate problems of heat generation.