POWERFUL STATION FOR NORWAY

Radio Record, Volume VII, Issue 4, 4 August 1933, Unnumbered Page

POWERFUL STATION FOR NORWAY

, Trondhjem To Have New Radio Service ... -_-ee As a first step in the reorganisation of the Norwegian. broadcasting system, which came under Government control on duly-1,; a new. highpower broadcastin station is to ‘be ‘erected at Trondhjem to replace the existing low-powered: station. ; The order for the .new. station. has been entrusted to Marconi’s .Wireless Telegraph Company, Ltd. and. the equipment will be manufactured at the company’s -works at -Chelmsford, Essex. The power of.the transmitter is 20 kilowatts unmodulated ‘aerial energy and godulation up to 100 per cent. is. arranged. The. transmitter will be adjustable to any’ wavelength between 200 and 545 metres; the working wavelength will be decided upon in accordance with the deliberations. of the Lucerne. Broadcasting Conference, The design of the new transmitter will incorporate the latest deyelopments in broadcasting technique, one of the most important, of ‘which is. the "series modulation" system, developed with conspicuous success -in: the .Marconi research laboratories. The application of this new method of modulation, which will. also be incorporated in the new 100 kilowatt high-power broadeasting transmitter which -:the Marconi Company -is building for the B.B.C. station at Droitwich, not only ensures a considerable simplification in transmitter design, but also’ provides lifelike and pute reproduction, due largely to the absence of ‘ironcored ‘chokes. or transformers which tend’ to introduce distortion. "Series modulation" ensures’ a high degree of linearity -and a. wide range: -of ' frequency response. Only one.stage: of modulated amplification ~ is . required, with. a consequent reduction in. harmonic distortion. , The Trondbjem transmitter is built in the form of a switchboard-on: which are mounted all the controls. Behind the. board are the transmitting valves with their attendant circuits. A valve drive which ensures a‘high degree of constancy, to. conform with the most stringent. requirements ‘of the: international regulations relating to the stabilisation of transmission frequencies, is incorporated. ~ "The masts of the, existing station will be used, but the aerial; instead of leading: straight into the transmitting house, will be ‘connected’ to. the. ouiput stage of the transmitter. by means of a two-wire high frequency feeder to convey the energy from the transmitter to-the aerial. The: transfer of the modulated. high frequency energy will take: place by means of suitable coupling. circuits, located, ina .smail feeder house. situated. underneath. the aerial. .