Long-Wave Radio Transmission Phenomena Associated with a Cessation of the Sun's Rays
01 January 1936
C O M M E R C I A L transatlantic radio telephone service to Europe was inaugurated on January 7, 1927, using a long-wave circuit on a frequency of 60 kilocycles. The difficulties of maintaining a satisfactory long-wave circuit through t h a t part of each day when sunset conditions existed along the transmission path had been recognized 1 * for several years prior to the opening of service. After short-wave facilities were added to the transatlantic service, it became important to coordinate operating times of the short-wave transmitters in relation to the long-wave channel to assure maximum reliability and efficiency of service. In order to do this, a more precise knowledge of the * Numbers refer to appended list of references.