Four/two-channel time-division-multiplex telegraph system for long-distance radio circuits
14 June 1951
A combined electrical and electro-mechanical system. Signal inaccuracies from the distributor are corrected by an electronic regenerator (which also makes possible synchronization of tone-channel carrier to multiplex baud speed, thus lowering carrier distortion, and also permits manual morse). Signals at the receiving end are regenerated and distributed electromechanically, permitting monitoring and error detection (Verdan scheme). Circuits and their operation are described.