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Distance measuring equipment. In aviation, distance measuring equipment (DME) is a radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals in the frequency band between 960 and 1215 megahertz (MHz). Line-of-visibility between the aircraft and ...
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. To prevent interference between different users, the generation and transmission of radio ...
The 900 MHz band (935-940 MHz) is available solely for Industrial users. Finally, Public Safety entities are allotted an exclusive band of frequencies at 758-806 MHz. Low band has longer range capability, but requires mobile antennas as long as nine feet (2.7 m) tall.
The 23 centimeter, 1200 MHz or 1.2 GHz band is a portion of the UHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use on a secondary basis. The amateur radio band is between 1240 MHz and 1300 MHz. The amateur satellite band is between 1260 MHz and 1270 MHz, and its use by satellite operations is ...
144–148 MHz: Amateur radio 2-meter band; 148–150 MHz: Land mobile, fixed, satellite; 150–156 MHz: "VHF business band", public safety, the unlicensed Multi-Use Radio Service (MURS), and other 2-way land mobile, FM; 156–158 MHz VHF Marine Radio. 156.8 MHz (Channel 16) is the maritime emergency and contact frequency. 159.81-161.565 MHz ...
In Europe and Africa (defined as International Telecommunication Union (ITU) region 1) and in Australia and New Zealand, [1] it spans from 87.5 to 108 megahertz (MHz) - also known as VHF Band II - while in the Americas (ITU region 2) it ranges from 88 to 108 MHz. The FM broadcast band in Japan uses 76 to 95 MHz, and in Brazil, 76 to 108 MHz.
19.95–20.05 mhz standard frequency and time signal (20 mhz) 2 498-2 501 mhz standard frequency and time signal (2 500 mhz) 4 995–5 003 mhz standard frequency and time signal (5 000 mhz) 5 003–5 005 mhz standard frequency and time signal space research: 9 995–10 003 mhz standard frequency and time signal (10 000 mhz)
t. e. An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. [1] The generally accepted standard hearing range for humans is 20 to 20,000 Hz. [2][3][4] In air at atmospheric pressure ...