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The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz).Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.
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.
87.5–108 MHz: Band II Radio; 118–137 MHz: Airband for air traffic control, AM. 108–117.975 MHz: Air navigation beacons VOR and ILS; 121.5 MHz is an emergency frequency; 144–148 MHz: Amateur radio 2-meter band; 156–162.2 MHz: Marine radio; 174–230 MHz: Band III Television (channels 4–11)
Acoustic – G 10, the highest pitch sung by Georgia Brown, who has a vocal range of 8 octaves. 44.1 kHz: Common audio sampling frequency: 10 5: 100 kHz: 740 kHz: The clock speed of the world's first commercial microprocessor, the Intel 4004 (1971) 10 6: 1 megahertz (MHz) 530 kHz to 1.710 MHz: Electromagnetic – AM radio broadcasts 1 MHz to 8 MHz
US frequency allocations chart, 2016. Frequency allocation (or spectrum allocation) is the part of spectrum management dealing with the designation and regulation of the electromagnetic spectrum into frequency bands, normally done by governments in most countries. [1]
In Canada, the United States, Mexico, the Bahamas, etc., there are 101 FM channels numbered from 200 (center frequency 87.9 MHz) to 300 (center frequency 107.9 MHz), though these numbers are rarely used outside the fields of radio engineering and government. The center frequencies of the FM channels are spaced in increments of 200 kHz.
Frequency range Wavelength range ITU designation IEEE bands [5] Full name Abbreviation [6] Below 3 Hz >10 5 km — 3–30 Hz 10 5 –10 4 km: Extremely low frequency: ELF — 30–300 Hz 10 4 –10 3 km: Super low frequency: SLF — 300–3000 Hz 10 3 –100 km: Ultra low frequency: ULF — 3–30 kHz 100–10 km: Very low frequency: VLF — 30 ...
(MHz) Common name Subset of band Uplink [C 2] (MHz) Downlink [C 3] (MHz) Duplex spacing (MHz) Channel bandwidths (MHz) Notes 6 FDD 800 UMTS 800 5, 19, 26 830 – 840 875 – 885 45 5, 10 9 FDD 1800 UMTS 1700 3 1749.9 – 1784.9 1844.9 – 1879.9 95 5, 10 10 FDD 1700 Extended AWS 66 1710 – 1770 2110 – 2170 400 5, 10, 15, 20 22 FDD 3500 C ...