Word: skala
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Dates: during 1920-1929
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Radio "Separator." In Berwyn, Chicago suburb, radio engineers crowded around L. William Skala, young graduate of the University of Prague, to observe his demonstration of a device for separating two radio messages sent simultaneously by different transmitters set at the same frequency. A wave-metre showed that the transmitters were on identical wave lengths. The "beat" note or interference whistle was heard in the receiver before the test. Then Skala attached one of his devices to each transmitter and one to the receiver. With a switch at the receiving end he was able to "cut out" either transmitter at will...
...many stations are now forced to use the same wavelengths, going on the air at different hours by agreement. There was a hopeful stir when John Hays Hammond Jr. proved the possibility of sending many messages on a single "carrier" wave upon which modulations were impressed (TIME, Oct. 26). Skala's invention promises to simplify air-traffic even further, to solve the selectivity problem of listeners-in, to open the field of wireless telephony as a substitute for common wire service...