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WSMV-TV (channel 4) is a television station in Nashville, Tennessee, United States, affiliated with NBC. It is owned by Gray Television alongside low-power Telemundo affiliate WTNX-LD (channel 29). The two stations share studios on Knob Road in west Nashville, where WSMV-TV's transmitter is also located.
December 31, 2008. (2008-12-31) (national network) 2009–2015 (local stations) NBC Weather Plus was an American weather-oriented digital multicast television network owned as a joint venture between NBCUniversal and the local affiliates of the NBC television network. [1] The service, which was broadcast in standard definition, was carried on ...
WAFF (TV) WAFF (channel 48) is a television station in Huntsville, Alabama, United States, affiliated with NBC. It is owned by Gray Television alongside low-power Telemundo affiliate WTHV-LD (channel 29). The two stations share studios on Memorial Parkway (US 431) in Huntsville; WAFF's transmitter is located south of Monte Sano State Park.
NEXRAD or Nexrad (Next-Generation Radar) is a network of 159 high-resolution S-band Doppler weather radars operated by the National Weather Service (NWS), an agency of the National Oceanic and Atmospheric Administration (NOAA) within the United States Department of Commerce, the Federal Aviation Administration (FAA) within the Department of Transportation, and the U.S. Air Force within the ...
Over-the-horizon radar. How a skywave OTH radar works: A powerful shortwave signal from a large transmitting antenna (left) reaches a target beyond the horizon by refracting off the ionosphere, and the echo signal from the target (right) returns to the receiving antenna by the same route. In practice, the beams are much closer to the horizon ...
Weather radar in Norman, Oklahoma with rainshaft Weather (WF44) radar dish University of Oklahoma OU-PRIME C-band, polarimetric, weather radar during construction. Weather radar, also called weather surveillance radar (WSR) and Doppler weather radar, is a type of radar used to locate precipitation, calculate its motion, and estimate its type (rain, snow, hail etc.).
Continuous-wave radar (CW radar) is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects. [1] Individual objects can be detected using the Doppler effect, which causes the received signal to have a different frequency from the transmitted signal, allowing ...
Doppler effect. The emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h). This is only a component of the real speed (170 km/h). The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference ...