Abstract
THE normal maximum field-strength in Kent of the broadcast transmission on 9,700 kc./s. (30.93 metres) from Sofia in undisturbed propagation conditions, and at times of the evening or night when 9.7 Mc./s. is about the optimum working frequency for the transmission path by single refraction in the F-2 layer, is about 1.0–1.5 millivolts per metre (Fig. 1). The aerial power of the Sofia transmitter is believed to be 120 kW. approximately, and the calculated quasi-maximum field-strength in conditions of minimum absorption agrees fairly closely with this field-strength being obtained at the path-distance involved.
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GRIFFITHS, H. Focusing of Waves in Radio Reception. Nature 175, 948–949 (1955). https://doi.org/10.1038/175948c0
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DOI: https://doi.org/10.1038/175948c0
