Standard Frequency Transmissions in Great Britain

Abstract

THE question of radiating standard frequency transmissions from Great Britain has recently been under consideration. Such transmissions are of great value in connexion with the calibration of industrial and scientific frequency sub-standards, in connexion With Work on radio wave propagation and also for survey purposes. At present, standard frequency transmissions of guaranteed accuracy are emitted by the U.S. National Bureau of Standards¹ continuously on the eight frequencies 2·5, 5, 10, 15, 20, 25, 30 and 35 Mc./s. from station WWV. Unfortunately, on account of radio propagation conditions, it is often difficult to make good use of the American transmissions in Europe and farther east. At the recent meeting of the International Telecommunications Union at Atlantic City, it was agreed that the first six of the above frequencies (namely, 2·5, 5, 10, 15, 20 and 25 Mc./s.) should be allocated on a world-wide basis for all future standard frequency transmissions. Hence, if undesirable interference between such transmissions is to be avoided, all new services of standard frequency transmissions will require very careful co-ordination with existing services.