BEAM ACHIEVEMENT

Evening Post, Volume CVII, Issue 51, 5 March 1929, Page 9

BEAM ACHIEVEMENT

MULTIPLEX SYSTEM

SPEECH AND CODE TOGETHER

Australian I'resa Association—United Service.

(Eoceived sth March, 10 a.m.)

LONDON, 3rd March,

Tho "Daily Mail" reports that another revolution in wireless telephony achievement was demonstrated at the Bridgewater beam station. Speech was transmitted 3000 miles to the Marconi Company'a vice-chairman at Montreal by a multiplex system, on tho same wave-length simultaneously with two wireless telegrams, which were being uninterruptedly relayed at London at the rate of hundreds of words per minute. The invention incorporates a unique degree of efficiency and economy, and may be applied to all the beam stations in tho Imperial chain, avoiding the necessity of erecting now or adding to existing telephonic stations. Sir Basil Blackett, chairman of Imperial Communications, Ltd.; Mr. G. F. Kelleway ,general.manager of Marconi's, Ltd.; and other high officials; and Mr. Mathieu, inventor of the process, witnessed the demonstration and carried on conversations with perfect audibility with officials at Montreal. Spoken messages- are regulated, fading is checked, and uniformity of tone is maintained. Immediately ono speaker pauses, an automatic regulator permits the answer to come, but simultaneous speaking jams the communication. Tho invention secures almost complete secrecy, and listening-in is impossible without a similar installation. Apparatus -is being prepared for the South African beam station. Imperial adoption of the system would enormously cheapen- communication, enabling four telegraphic and'one telephonic communications to be made on the same xvaveleugth simultaneously.