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Radio Record, Volume III, Issue 28, 24 January 1930, Page 15

S a result of recent tests the police of New Jersey, U.S.A., are to be equipped with tiny receiving sets, which have been made to operate at a dis_tance of three and a half miles from the ‘headquarters’ broadcasting’ station. During the tests speech was. heard clearly in a basement, some distance ‘from headquarters. The outfit includes ‘a set of collapsible phones, and the "patrolman’s badge serves as an aerial. The twinkling of a red light attached to the sleeve indicates that headquarters is about to transmit,