Description English: A dramatic public relations demonstration in 1940 by General Electric of the resistance to static (RFI) of its new radio broadcasting technology, frequency modulation (FM). It was held in GE's high voltage lab in New York, with a lightning-like arc from a million volt three phase-transformer as a source of interference behind the radio. The prototype radio, center, had both an AM and FM receiver. The AM receiver was tuned to music from WABC, GE's New York City AM station. The FM receiver was tuned to the same program rebroadcast by Edwin Armstrong's experimental FM radio station, W2XMN, in Alpine, New Jersey. When the AM radio was turned on, only a roar of static from the spark could be heard. When the FM radio was turned on, the music program came through clearly with just a slight amount of static. It took until the 1970s for FM broadcasting to really catch on, but today virtually all serious music broadcasting has moved from AM to FM due to its superior audio quality.
Alterations to image: cloned out some text graphics overlaying the image in the upper left corner.
Date November 1940 Source Retrieved October 3, 2015 from E. W. Murtfeldt, "What are the facts about FM?" in Popular Science magazine, Popular Science Publishing Co., New York, Vol. 137, No. 5, November 1940, p. 70 on Google Books Author E. W. Murtfeldt
Permission This 1940 issue of Popular Science magazine would have the copyright renewed in 1968. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1967, 1968, and 1969 show no renewal entries for Popular Science. Therefore the copyright was not renewed and it is in the public domain.
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|current||03:24, October 30, 2015||571 × 698 (82 KB)||Miley Spears||Description English: A dramatic public relations demonstration in 1940 by General Electric of the resistance to static (RFI) of its new radio broadcasting technology, frequency modulation (FM). It was held in GE's high voltage lab in New York, with a ...|