Not to be confused with QR code or Wikidata § Main parts.
"QRO" redirects here. For the airport in Mexico, see Querétaro International Airport.
This is one of a set of articles on telegraphy.
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 transmitted as a statement, operators either prefixed it with the military network question marker "INT" ( ▄ ▄ ▄▄▄ ▄ ▄▄▄ ) or suffixed it with the standard Morse question mark UD ( ▄ ▄ ▄▄▄ ▄▄▄ ▄ ▄ ).
Although Q-codes were created when radio used Morse code exclusively, they continued to be employed after the introduction of voice transmissions. To avoid confusion, transmitter call signs are restricted; countries can be issued unused Q-Codes as their ITU prefix e.g. Qatar is QAT.
Codes in the range QAA–QNZ are reserved for aeronautical use; QOA–QQZ for maritime use and QRA–QUZ for all services.
"Q" has no official meaning, but it is sometimes assigned a word with mnemonic value, such as "question" or "query", for example in QFE: "query field elevation".[1]
^Franklin, 277808-Elizabeth A. "Aero 16 – Polar Route Operations". Archived from the original on 13 November 2001. Retrieved 5 September 2016.{{cite web}}: CS1 maint: numeric names: authors list (link)
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...
Z Code (like QCode and X Code) is a set of operating signals used in CW, TTY and RTTY radio communication. There are at least three sets of Z codes. There...
Q and Z codes, also called Q and Z signals may refer to: Qcode, 3-letter code beginning with Q and used by radiotelegraph and other radio services Z...
Q, or q, is the seventeenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others...
with Qcodes. These codes are defined by ICAO Doc 8400: ICAO Abbreviations and Codes. Qcode Brevity code "ICAO Doc 8400: ICAO Abbreviations and Codes" (PDF)...
language-specific code not used in either International or Gerke Morse. For the Greek letter Ψ, Greek Morse code uses the International Morse code for Q, ▄▄▄ ▄▄▄ ▄ ▄▄▄ ...
coenzyme Q may be distinguished by the number of isoprenoid subunits in their side-chains. The most common coenzyme Q in human mitochondria is CoQ10. Q refers...
alphabet is often written as q {\displaystyle q} . If q = 2 {\displaystyle q=2} , then the block code is called a binary block code. In many applications it...
Maui, for instance, has an IATA code of OGG and an ICAO code of PHOG. ICAO airport codes do not begin with I or J or X or Q, though the Jezero Crater on...
{F} _{q}^{n}} where F q {\displaystyle \mathbb {F} _{q}} is the finite field with q elements. Such a code is called a q-ary code. If q = 2 or q = 3, the...
The following Table of Morse code abbreviations and further references to Brevity codes such as 92 Code, Qcode, Z code, and R-S-T system serve to facilitate...
F-code, and three 351 Cleveland engines; the H-code 2-V, the M-code 4-V, and beginning in May 1971, the Q-code 351CJ (Cobra Jet or GT engine). M & Q code...
The Maritime Mobile Service QCodes are art of a larger set of QCodes designated by the ITU-R. The QOA–QQZ code range is reserved for the Maritime Mobile...
code may have been QJS.[citation needed] The U.S. Navy used R and K signals starting in 1929.[citation needed] The QSK code was one of the twelve Q Codes...
lists of airports by IATA code and ICAO code: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z This...
q = floor(N/M) remainder = r = N modulo M Generate codeword The code format : <Quotient code><Remainder code>, where Quotient code (in unary coding)...
The Aeronautical Code signals are radio signal codes. They are part of a larger set of QCodes allocated by the ITU-R. The QAA–QNZ code range includes phrases...
tuned more for low-rpm torque. Only the Q-code 351 "Cobra Jet" (1971–1974), R-code "Boss" 351 (1971), and R-code 351 "HO" (1972) versions have four-bolt...
advantages. Morse, using internationally agreed message encodings such as the Qcode, enables communication between amateurs who speak different languages. It...
Q and Z signals are brevity codes widely used in Morse code radio telegraphy. See, respectively: Qcode Z code This disambiguation page lists articles...
Global Information