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The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
GMRS: 462.675 MHz is a UHF mobile distress and road information calling frequency allocated to the General Mobile Radio Service and used throughout Alaska and Canada for emergency communications; sometimes referred to as "Orange Dot" by some transceiver manufacturers who associated a frequency with a color-code for ease of channel coordination ...
Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance. A distress signal indicates that a person or group of people, watercraft , aircraft , or other vehicle is threatened by a serious or imminent danger and requires immediate assistance ...
A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately ...
The following is a list of radio stations formerly owned by NBC via parent company RCA from 1926 until 1989. NBC formerly operated two radio networks in the United States: the NBC Radio Network from 1926 until 1987 (known as the NBC Red Network from 1926 to 1942) and the NBC Blue Network from 1926 until 1943 (known as the Blue Network from 1942 to 1945 and the American Broadcasting Company ...
WKQX (101.1 FM) is a commercial radio station licensed to Chicago, Illinois, featuring an alternative rock format known as "Q101". Owned by Cumulus Media, the station serves the Chicago metropolitan area. WKQX's studios are located in the NBC Tower, while the station transmits from atop the John Hancock Center.
2182 kHz is analogous to channel 16 on the marine VHF band, but unlike VHF which is limited to ranges of about 20 to 50 nautical miles (40 to 90 km) depending on antenna height, [3] communications on 2182 kHz and nearby frequencies have a reliable range of around 50 to 100 nautical miles (90 to 190 km) during the day and 150 to 300 nautical miles (280 to 560 km) or sometimes more at night.
Very high frequency (VHF) is the ITU designation [1] [2] [3] for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter.