Abstract
A REPORT from Science Service dated May 29 states that Dr. Balth. van der Pol, speaking at a meeting of the Institute of Radio Engineers in Philadelphia, has directed attention to the interference which may arise if the power of broadcasting stations is sufficiently increased. Dr. van der Pol reported that interference has been noticed in Holland between two distant high-power European stations separated in wave-length by more than 800 metres. This interference has been attributed to interaction or cross-modulation of the two sets of signals in the passage through the ionosphere. (See B. D. H. Tellegen, NATURE, 131, 840, June 10, 1933: V. A. Bailey and D. F. Martyn, NATURE, 133, 218, Feb. 10, 1934.) The effect is believed to increase rapidly as the power of the sending station increases, and if the same phenomenon is found to exist in America, it may prove to be a practical limitation to the power at which radio broadcasting stations can be operated. This would appear to be a new problem for the Federal Radio Commission to consider in the United States.
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Interference between High-Power Radio Stations. Nature 133, 979 (1934). https://doi.org/10.1038/133979a0
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DOI: https://doi.org/10.1038/133979a0