9/1/2023 0 Comments Listen to atcThe Z code adds commands and questions adapted for military radio transmissions, for example, "ZBW 2", which means "change to backup frequency number 2", and "ZNB abc", which means "my checksum is abc, what is yours?" Many military and other organisations that use Morse code have adopted additional codes, including the Z code used by most European and NATO countries. Many codes have no immediate applicability outside one individual service, such as maritime operation (many QO or QU series codes) or radioteletype operation (the QJ series). The QRA–QUZ code range includes phrases applicable to all services and is allocated to the International Telecommunication Union. The QOA–QQZ code range is reserved for the maritime service. The QAA–QNZ code range includes phrases applicable primarily to the aeronautical service, as defined by the International Civil Aviation Organization. A subset of Q-codes is used by the Miami-Dade County, Florida local government for law enforcement and fire rescue communications, one of the few instances where Q-codes are used in ground voice communication. These codes are used in radiotelephone conversations with air traffic control as unambiguous shorthand, where safety and efficiency are of vital importance. Some Q-codes are also used in aviation, in particular QNE, QNH and QFE, referring to certain altimeter settings. By the 1970s, the Post Office Handbook for Radio Operators listed over a hundred Q-codes, covering a wide range of subjects including radio procedures, meteorology, radio direction finding, and search and rescue. For example, QSW / QSX originally stood for, "Shall I increase / decrease my spark frequency?", but in the 1920s spark-gap transmitters were gradually being banned from land stations, making that meaning obsolete. Over the years the original Q-codes were modified to reflect changes in radio practice. The following table reviews a sample of the all-services Q-codes adopted by the 1912 convention:įirst twelve Q-codes listed in the 1912 International Radiotelegraph Convention Regulations A total of forty-five Q-codes appeared in the "List of Abbreviations to be used in Radio Communications", which was included in the Service Regulations affixed to the Second International Radiotelegraph Convention in London (The Convention was signed on July 5, 1912, and became effective July 1, 1913.) The Q-codes facilitated communication between maritime radio operators speaking different languages, so they were soon adopted internationally. prepared for the use of British ships and coast stations licensed by the Postmaster General". The original Q-codes were created, circa 1909, by the British government as a "List of abbreviations. "Q" has no official meaning, but it is sometimes assigned a word with mnemonic value, such as "Queen" for example in QFE: Queen's field elevation, or "Query", "Question", "reQuest". To avoid confusion, transmitter call signs are restricted no country is ever issued an ITU prefix starting with "Q".Ĭodes in the range QAA–QNZ are reserved for aeronautical use QOA–QQZ for maritime use and QRA–QUZ for all services. To distinguish the use of a Q-code transmitted as a question from the same Q-code transmitted as a statement, operators either prefixed it with the military network question marker " INT" (dit dit dah dit dah) or suffixed it with the standard Morse question mark UD (dit dit dah dah dit dit).Īlthough Q-codes were created when radio used Morse code exclusively, they continued to be employed after the introduction of voice transmissions. It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially amateur radio. The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". For the letter used in place of Q in some Inuit orthographies, see Kra (letter). Challenging weather conditions include low ceilings, limited visibility, high or gusty winds, or thunderstorms.Ĭlick on airport name to go to that airport area's feeds."Qra" redirects here. This page lists airport areas that may be interesting to listen to because of challenging flying (weather) conditions. (updated every 30 minutes - sorted alphabetically by ICAO code) Current Potentially Bad Weather Airport Areas |
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