Word: wbbm
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Dates: during 1920-1929
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...connection with these investigations of the sun's surface, we have made arrangements with Station WBBM of Chicago for nightly measurement of the intensity of radio reception with a view to ascertaining just what effect these electrical storms, which might be compared to cyclones or hurricanes on the earth, have on the strength of the radio waves. By comparing the graphs of the sun spots and the radio reception we were gratified to discover that, invariably, as the number and intensity of sunspots increased, radio reception grew worse, until, at the peak of the period of sun spot activity, called...
After preliminary experiments it was found that the hour from nine to ten o'clock in the evening was on the whole best suited for determining the strength of the radio signals each night. The broadcasting station, WBBM of Chicago, maintained reliable consistency in power which it transmitted and communicated with the Astronomical Laboratory concerning any departures from normal conditions. The intensity of the signal strength measured is that of the carrier wave which is not apparently affected by the modulations of the program broadcasted...