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FM broadcasting
Videos
FM broadcasting is a radio broadcasting method that uses frequency modulation transmissions. In November 1919, Hans Idzerda began broadcasts, using narrow-band FM, over station PCGG, located at The Ha
A commercial 35 kW FM radio transmitter built in the late 1980s. It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts on 95.5 MHz
A commercial 35 kW FM radio transmitter built in the late 1980s. It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts on 95.5 MHz.
FM has better rejection of static (RFI) than AM. This was shown in a dramatic demonstration by General Electric at its New York lab in 1940. The radio
FM has better rejection of static (RFI) than AM. This was shown in a dramatic demonstration by General Electric at its New York lab in 1940. The radio had both AM and FM receivers. With a million-volt arc as a source of interference, the AM receiver produced a roar of static, while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter in New Jersey.
Crossed-dipole antenna array of station KENZ's 94.9 MHz, 48 kW transmitter on Lake Mountain, Utah. It radiates circularly polarized radio waves.
Crossed-dipole antenna array of station KENZ's 94.9 MHz, 48 kW transmitter on Lake Mountain, Utah. It radiates circularly polarized radio waves.
Armstrong's first prototype FM broadcast transmitter, located in the Empire State Building, New York City, which he used for secret tests of his syste
Armstrong's first prototype FM broadcast transmitter, located in the Empire State Building, New York City, which he used for secret tests of his system between 1934 and 1935. Licensed as experimental station W2XDG, it transmitted on 41 MHz at a power of 2 kW.
Radio broadcasting
Videos
Radio broadcasting is the transmission of signals, especially audio, to receivers using radio waves over a wide area. Listeners require a broadcast radio receiver to receive these signals. "Terrestria
Broadcasting tower in Trondheim, Norway
Broadcasting tower in Trondheim, Norway
Charles Logwood broadcasting at 2XG in New York City in 1916.
Charles Logwood broadcasting at 2XG in New York City in 1916.
November 5, 1919 Nieuwe Rotterdamsche Courant advertisement, announcing PCGG's debut broadcast scheduled for the next evening, using narrow-band frequ
November 5, 1919 Nieuwe Rotterdamsche Courant advertisement, announcing PCGG's debut broadcast scheduled for the next evening, using narrow-band frequency modulation (FM).
Control room and radio studio of the Finnish broadcasting company Yleisradio (YLE) in the 1930s.
Control room and radio studio of the Finnish broadcasting company Yleisradio (YLE) in the 1930s.