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Letter beacons are radio transmissions of uncertain origin and unknown purpose, consisting of only a single repeating Morse code letter. They have been classified into a number of groups according to transmission code and frequency, and it is supposed that the source for most of them is Russia and began during the Soviet Union .
Air is thin enough that in the Earth's atmosphere radio waves travel very close to the speed of light. The wavelength is the distance from one peak (crest) of the wave's electric field to the next, and is inversely proportional to the frequency of the wave. The relation of frequency and wavelength in a radio wave traveling in vacuum or air is.
The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially amateur radio. To distinguish the use of a Q-code transmitted as a question from the same Q-code ...
The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14.000 MHz to 14.350 MHz. [1] The 20-meter band is widely considered among the best for long-distance communication ( DXing ), and is one of the most popular—and crowded—during contests. [2] Several factors contribute to this, including the band's large size, the ...
SINPO code explained. The relative strength of the transmission. Interference from other stations on the same or adjacent frequencies. The amount of atmospheric or man-made noise. Whether the signal is steady or fades from time to time. An overall score for the listening experience under these conditions.
QN Signals. The QN Signals are Morse code operating signals that were introduced for Amateur radio net operation in 1939 on the Michigan QMN Net to lighten the burdens of net control operators. Originally created by a committee of the Detroit Amateur Radio Association led by Ralph Thetreat, W8FX. [1] Ev Battey W1UE (W4IA-SK), then ARRL ...
Home Office radio was the VHF and UHF radio service provided by the British government to its prison service, emergency service ( police, ambulance and fire brigade) and Home Defence agencies from around 1939.
KSAN (107.7 MHz, "107.7 The Bone") is a commercial FM radio station licensed to San Mateo, California, and serving the San Francisco Bay Area. It is owned and operated by Cumulus Media and it airs a mainstream classic rock radio format. It also serves as the FM flagship station for the San Francisco 49ers Radio Network.