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FM has better noise (RFI) rejection than AM, as shown in this dramatic New York publicity demonstration by General Electric in 1940. The radio has bot
FM has better noise (RFI) rejection than AM, as shown in this dramatic New York publicity demonstration by General Electric in 1940. The radio has both AM and FM receivers. With a million-volt electric arc as a source of interference behind it, the AM receiver produced only a roar of static, while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter W2XMN in New Jersey.
Frequency spectrum and waterfall plot of a 146.52 MHz carrier, frequency modulated by a 1,000 Hz sinusoid. The modulation index has been adjusted to a
Frequency spectrum and waterfall plot of a 146.52 MHz carrier, frequency modulated by a 1,000 Hz sinusoid. The modulation index has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.
An American FM radio transmitter in Buffalo, NY at WEDG
An American FM radio transmitter in Buffalo, NY at WEDG
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Earth station at the satellite communication facility Raisting Earth Station in Raisting, Bavaria, Germany
Earth station at the satellite communication facility Raisting Earth Station in Raisting, Bavaria, Germany
Optical fibre provides cheaper bandwidth for long-distance communication.
Optical fibre provides cheaper bandwidth for long-distance communication.