BEAM WIRELESS IS USED SIMULTANEOUSLY FOR TWO PURPOSES

Manawatu Times, Volume LIV, Issue 6889, 20 April 1929, Page 10

BEAM WIRELESS IS USED SIMULTANEOUSLY FOR TWO PURPOSES

TELEPHONIC AND TELEGRAPHIC COMMUNICATIONS CARRIED -ON BETWEEN ENGLAND AND CANADA. LONDON. Sir Robert Donald, chairman of the Imperial Wireless Telegraphy Committee, in a signed article in the Daily Mail, describe sthe successful tests of a British wireless invention at Bridgewater, Somerset, by means of which the beam system is used simultaneously for telegraphy and telephony between England and Canada. By aid of the new device, which, it is said, foreshadows a revolution in long-distance communication, beam wireless stations already existing can be used for simultaneous telephony and telegraphy, and with almost complete secrecy. According to Sir Robert, the new system obviates the delay and expense of special wireless stations contemplated by the British Post Office as an empire telephonic link, and the other advantages are cheapness, speed, economy in power and greater efficiency. The new method, known as the Mar-coiu-Mattfncu multiplex, transmits the voice and Morse messages on the same wavelength and separates them upon reception automatically by means of an "echo suppressor” and a "gain” controller.

Those who witnessed the Bridgewater tests besides Sir Robert worn Sir Basil Blackett, chairman of the newly-organised Imperial Communications Company; David Sarnoff, executive head of the Radio Corporation of America; R. N. Vyvian, chief engineer of the Marconi Company which built the beam stations; Mr Matthieu, who evolved the new inventions in the Marconi laboratories, and E. G. Ivellaway, managing director of the Marconi Company.