CAUSES OF NOISES

Hawke's Bay Tribune, Volume XXIII, Issue 103, 12 April 1933, Page 10

CAUSES OF NOISES

BAD EARTHS THE CHIEF. Addressing the Electricity Supply Engineers’ Association of New South Wales, Mr O. F. Mingay, of the Institute of Radio, said that radio engineers had done all they could towards eliminating electrical interference and now looked to the supply authorities to concentrate on the problem. Television was being developed and would shortly be generally available, but before it would be a success the subject of interference would have to be overcome. The common cause of interference in radio sets was the fact that earth wires were fitted to water mains, which, though running to earth, also acted as a common earth for electrical supply installation. Earth wires should be run directly to earth. Technical papers were read by several members of the conference, and Mr W. T. Crawford, radio inspector. It was stated that interference was traceable to electric fans, vacuum cleaners, irons, refrigerators, small motors in the household and outside to electric trains and trains, and street lighting faults. Attempts in some countries to eliminate interference at the source had not been successful. Mr Lemaire, electrical engineer, complained that a lot of trouble was caused by the “sloppy” way in which some wireless sets were installed. In reply to a question, Mr Mingay said that until the Government provided country stations with high power and long wave-length country listeners would not obtain satisfactory service.