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Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.
World radio systems (Terrestrial) System Type Modulation Data rate Sidebands? Ch. Bandwidth Radio spectrum Sound Codec Digital subchannels SFN Metadata/RDS/RBDS; AM radio: Analog radio: Amplitude Modulation: N/A? 18–20 kHz: 148.5-283.5 kHz (Longwave) 510–1610 kHz (Europe) 510–1710 kHz (USA and Canada) N/A: N/A: No: None Motorola C-QUAM ...
Callsign Frequency City of license WCAB: 590 AM: Rutherfordton, North Carolina: WCAM: 1590 AM: Camden, South Carolina: WCAO: 600 AM: Baltimore, Maryland: WCAP: 980 AM
AM radio remained the dominant method of broadcasting for the next 30 years, a period called the "Golden Age of Radio", until television broadcasting became widespread in the 1950s and received much of the programming previously carried by radio. Later, AM radio's audiences declined greatly due to competition from FM (frequency modulation ...
In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.
Class B and D stations can be found on any frequencies from 540 kHz to 1700 kHz except where frequencies have been reserved for Class C stations. Class C stations can be found in the lower 48 US states on the frequencies of 1230 kHz, 1240 kHz, 1340 kHz, 1400 kHz, 1450 kHz, and 1490 kHz (commonly known as "graveyard" frequencies).
"Radio T-POT" 918 Gasselternijveen, Drenthe Netherlands "Radio de Vliegende Hollander" 1467 Meppel Drenthe Netherlands “Ror. Dor. 747” 747 Bangkok Thailand Territorial Defence Department "RTHK Radio 3" 567 Golden Hill, Hong Kong China (People's Republic) Radio Television Hong Kong Spoken word "RTHK Radio 5" 783 Golden Hill, Hong Kong
Frequency: Radio Broadcast Stations (FCC) State/city: Radio Broadcast Stations (FCC) 1/1/1939 Call letters Radio Broadcast Stations (FCC) Frequency Radio Broadcast Stations (FCC) State/city: Radio Broadcast Stations (FCC) 1/1/1940 Call letters: Radio Broadcast Stations (FCC) Linked site is missing pages 96–97 Frequency: Radio Broadcast ...