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The Bureau's standard frequency station, .V~W, was destroyed by fire November 6. A temporary transmitter has been established in another building and has begun a reduced service. It broadcasts the frequency five megacycles (= 5ooo kilocycles) per second, every day (except Sunday) from Io A.M. to midnight. This is continuous-wave only, with telegraphic code announcements of the call letters WWV every 2o minutes. The accuracy of the frequency is the same as in the past, viz., better than a part in ten-million.
The broadcast is from a I-kilowatt transmitter. Generally speaking, it is most useful for moderate distances in the daytime and long distances at night. More precisely, for reception in locations reasonably free from interference, it is receivable at all distances up to IOOO miles from Washington in the middle of the day. The distance range increases after about 4 r.M. (E.S.T.) until at night the broadcast is receivable throughout the United States; sometimes at night it may be difficult to receive it at distances between 5o and 5oo miles. while it is easy to receive it beyond 5oo miles. In the spring the daytime distance range will decrease, dropping to about 5oo miles in the summer. This restricted service will continue for some months. As rapidly as possible a new station will be established to provide more fully than in the past, standard frequencies receivable at all times throughout the country. These will include standard radio frequencies, standard seconds pulses, and the standard of musical pitch, 44 ยฐ cycles per second, which will unfortunately not be available during the period in which the temporary transmitter is used.
๐ SIMILAR VOLUMES
Beginning on May I, the following changes became effective in the standards of frequency and musical pitch broadcast from the Bureau's radio station WWV at Beltsville, Md. : (a) The frequency of 2o megacycles per second has been replaced by I5 mc./sec.; (b) announcements are given by voice only, not