European Wavelengths Change

Radio Record, Volume II, Issue 37, 28 March 1929, Page 5

European Wavelengths Change

J’ order to prevent heterodyning among Wuropean stations, the wavelengths have been reallocated on the "Plan de Bruxelles." This was the result of a conference of the technicians representing European broadeasting organisations in Brussels in October last. The basic principle has been to specify a minimum separation between the carrier waves, but an endeavour has en made to take into account as far 4s the available facilities will allow. f the present situation in Wurope. In brief the chief difficulty lay in finding some nine additional waves about .800 metres, at the same time facing the

loss of the three waves in this band (510,520,580 kilocycles) owing to the provisions of the recent Washington Radio Telegraphic Convention. , After experiment it was found that the separation between the fundamental carrier frequencies of station should be reduced from 10 to 9 kiloeycles for wavelengths above 300 metres. This, although not an ideal solution, has been rendered practicable owing to the greater degree of accuracy with which modern transmitters can maintain their carrier frequencies at the allotted figure. Thus five channels