Word: signalizes
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Dates: during 1950-1959
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...sputnik's familiar beep-beep must have been heard by radio or TV, by a great part of the world's population tone music-minded Swedish radio listener firmly asserted that the beep is in A-flat). U.S. experts could not tell at first whether the signal, which alternates between 20 and 40 megacycles, is a mere series of beeps, or whether it carries coded information from instruments in the satellite...
Fred L. Whipple, director of the Smithsonian Observatory, speculated that the satellite may be conserving its battery strength by transmitting scientific data back to Russia only on command. A coded radio signal from a station in Russia may activate a sending device within the satellite which would report on scientific measurements once...
...Allen Hynek, director of the Smithsonian Astrophysical Observatory's optical tracking program, revealed yesterday that three major radio installations--one in New York, one in Chicago, and one in Cambridge--which had previously been picking up the satellite's steady beep beep signal lost radio contact with the object late Monday night and yesterday morning...
Scientists could give no explanation for yesterday's break in communications, Many had suspected that the satellite's radio batteries were running down, but they were confounded by the resumption of the signal...
...Naval Research Laboratory in Washington reported that the signals faded out about 4 p.m. yesterday but were again picked up strongly at 10 p.m. There was no variation in the type or frequency of the signal...