Time-Division Multiplex in Radiotelegraphic Practice

The paper outlines certain methods of multiplexing telegraphic signals on a common communication channel and the factors governing the application of these methods to radio circuits. The recently developed trend toward the use of multiplex methods in radiotelegraphic service is discussed. Consideration is given to the advantages of using the time division method based on the baud, at least at the present state of the radio art. General specifications for the equipment are stated, based on practical operating requirements. Major changes from practices obtaining on wire-line multiplex systems are mentioned and the reasons therefor are given. A description of a practical system based on the above considerations and its use and effectiveness in a large radiotelegraph organization is furnished.