Abstract
Measurements have been made on the magnitude of the discrepancies to be expected in the practical application of maximum usable frequency (m.u.f.) calculations. The maximum usable frequencies for radio transmission over distances of 1000 km. and 2500 km. have been deduced from continuous observations at sunrise and sunset of the relative field strength of signals received at Slough from short-wave broadcasting stations located near Berlin and Moscow respectively. It was found that the discrepancy between mean calculated and observed values of m.u.f. amounted to - 3% for 1000 km. and to - 11% for 2500 km. From a critical examination of the results it is concluded that a large proportion of these errors, particularly for the distance 2500 km., was due to inadequate knowledge of the ionosphere characteristics near the mid-point of the trajectory, and that the real errors of the mean calculated values probably do not exceed ±2% at 1000 km. and ±3% at 2500 km.
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