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Electrical Disturbance of Radio Reception

    Naturevolume 134page765 (1934) | Download Citation



    IT is well known that broadcast reception is often seriously interfered with by outside electrical disturb ances over which the receiver has no control. A special committee was appointed by the Institution of Electrical Engineers a year ago to consider this problem, and evidence and assistance has been given to it by several official and unofficial organisa tions. At this early stage, it is clear that radio interference is widespread and constitutes a serious annoyance to the public. The committee finds that listeners and those who advise them have not yet done all that is possible on their receiving sets to mitigate some of the effects of interference. A memorandum has been prepared for the committee by the B.B.C. on the features of design and installa tion of radio sets which, when attended to, help to lessen, sometimes very appreciably, this trouble. The attention of those who supply radio sets is directed to this memorandum. On the Continent, where State regulations are favoured, little assistance is given to those listeners who do not take reasonable precautions against interference. Still, when the listener has done all he can, there is left a large amount of interference which can only be effectively corrected by suppression at the source. Interfering apparatus generally has a commutator motor, but mercury arc rectifiers and high-tension lines under certain conditions may cause trouble. As a first Step towards assisting those manufacturers who desire to produce interference-free appliances, the committee has taken the initiative in the preparation of a speci fication with this end in view, and it is hoped with the co-operation of the British Standards Institution to issue a complete specification early next year.

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