Radio societies' meetings: Ionospheric c
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Article
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1940
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Elsevier Science
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English
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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 : (a) The frequency of 2o megacycles per second has been replaced by I5 mc./sec.; (b) announcements are given by voice only, not