David F Mears, Hubert A Patterson: Mobile vehicular repeater system which provides up-link acknowledgement signal to portable transceiver at end of transceiver transmission. General Electric Company, Cushman Darby & Cushman, September 3, 1985: US04539706 (122 worldwide citation)

A mobile vehicular repeater detects the termination of a received transmission from a portable transceiver to be repeated and, in response to such detection, activates the up-link radio transmitter so as to send an acknowledgement signal to the message originating portable transceiver station signif ...

David F Mears: Programmable radio. General Electric Company, M Masnik, R C Lampe Jr, June 25, 1985: US04525865 (66 worldwide citation)

An arrangement for externally programming a radio upon proper identification under microcomputer control using fixed and transient memories without removing or adding circuit modules to the radio.

David F Mears, Paul Goodjohn: Parasitic radio transmission system. Beusse Brownlee Bowdoin & Wolter P A, October 3, 2002: US20020142767-A1

A system is disclosed for sending parasitic digital packets over a trunked radio system network during the time that a trunking channel is unoccupied. The parasitic digital packets are received by one or more parasitic receivers, which are not a part of the conventional trunked radio system. To ensu ...