Q-CODES

If you thought you knew all the Q-Codes, we think this list will surprise you. The abridged definitions of the "official" codes are derived from a very detailed list compiled by Jim, G4RGA, using information extracted from Allied Communications Publication 131(B), Amendment 1.  The current codes were assigned meanings by the International Telecommunications Union in 1959, but the idea of Q-Codes was first mooted at the Berlin International Radiotelegraph Conference of 1906.  A formal list of Q-Codes was instituted at the London Radiotelegraph Convention of 1912. 

Also included, are the "unofficial" meanings assigned by the American Radio Relay League (ARRL) to QEX and QST and to codes in the QNA to QNZ series, which are defined in the ARRL Handbook for Radio Amateurs and should only be used in amateur CW nets.  These net codes should not be used in casual amateur CW conversations or in phone nets.  When used by the Amateur Service, meanings assigned to codes in the QNA to QNZ series by other Services do not apply.  The Amateur Service also uses three unofficial "four letter Q-Codes", QRSS, QSLL and QTHR, which are also included.  Thanks to Denzil, G3KXF, for providing this additional information. Denzil also points out that Robert Harris, in his book "Enigma", defines QRJ, QWP, QXA, QXH and QZE as having meanings different from those officially recognised.  It is open to debate as to whether these are accurate definitions of codes used by the German Military during the Second World War or are simply errors.  I have also included some alternative meanings suggested by Bob Zinn, N5BZ, although the exact
source and authenticity of these are unknown.

Q-Codes in the QAA to QNZ series are reserved for the Aeronautical Service and are defined in ICAO Procedures for Air Navigation Services (PANS), Abbreviations and Codes (Doc 8400).  Those in the QOA to QOZ series are reserved for the Maritime Services and are defined in ITU document RR1990, Appendix 14, while those in the QRA to QUZ series are reserved for all Services and are defined in Appendices 13 and 14 of the same document.  Q-Codes in the QVA to QZZ series are not defined and are intended for other uses.

Most, but not all, of the codes can be used either as a statement or a question, depending on the context of their use, but I have only shown the question form in my list of Q-Codes.  These Q-Codes were intended for CW use, where the question form would be denoted by following the code with a question mark (..--..).  When using the ARRL definitions of codes in the QNA to QNZ series, no question mark is necessary, even though the meaning may be interrogatory.  Radio amateurs, and some professional operators, also use these codes on telephony, where the context is more obvious.

Also, in amateur radio use, Q-Codes are often used as an abbreviation for a longer phrase.  For example, QTH is used to indicate the location of the station as in "My QTH is Storrington", whereas QTH actually means "What is your position in latitude and longitude (or according to some other recognised location system)" or "My position is .......".  Abbreviated meanings of other Q-Codes, together with the meanings of jargon and standard abbreviations are given in the abbreviations and jargon section.

List of Q-Codes

QAA    Unassigned
QAB    May I have clearance from ... to ... at ...(height) above ...(datum).
QAC    Unassigned
QAD    Unassigned
QAE    Unassigned
QAF    Will you advise me when you are/were at/over ...(place)
QAG    Arrange your flight in order to arrive over ...(place) at ...(time)
QAH    What is you height above ...(datum)
QAI    What is the essential aircraft (not communications) traffic
QAJ    Unassigned
QAK    Is there any risk of collision
QAL    Are you going to land at ...(place) or Has aircraft landed at ...(place)
QAM    What is the latest available meteorological observation for ...(place)
QAN    What is the surface wind direction and speed at ...(place)
QAO    What is the wind direction, in degrees TRUE, and the speed at ...(place)
QAP    Shall I listen for you on ... kHz/MHz
QAQ    Am I near a prohibited area
QAR    May I stop listening on the watch frequency for ... minutes
QAS    Unassigned
QAT    Unassigned
QAU    I am about to jettison fuel
QAV    Are you able to home on your DF equipment
QAW    I am about to carry out overshoot procedure
QAX    Unassigned
QAY    Will you advise me when you pass ...(place) bearing 090 degrees
QAZ    Are you experiencing communication difficulties due to a storm

QBA    What is the horizontal visibility at ...(place)
QBB    What is the amount, type and height of the cloud base at ...(place)
QBC    Report meteorological conditions at...(position) at ...(time)
QBD    How much fuel have you remaining
QBE    I am about to wind in my aerial
QBF    Are you flying in cloud
QBG    Are you flying above cloud
QBH    Are you flying below cloud
QBI    Is flight under IFR compulsory at ...(place)
QBJ    What is the amount, type and height of the cloud top at ...(place)
QBK    Are you flying with no cloud in your vicinity
QBL    Unassigned
QBM    Has ...(callsign) sent any message for me
QBN    Are you flying between two layers of cloud
QBO    What is the nearest aerodrome where flight under VFR is permissible
QBP    Are you flying in and out of cloud
QBQ    Unassigned
QBR    Unassigned
QBS    Ascend or descend to ...(figures and units) height above ...(datum)
QBT    How far along the runway can the observer see the runway lights.  (See notes at the end of this list for a possible alternative meaning).
QBU    Unassigned
QBV    Have you reached the ...(figures and units) height above ...(datum)
QBW    Unassigned
QBX    Have you left the ...(figures and units) height above ...(datum)
QBY    Unassigned
QBZ    Report your flying conditions in relation to clouds
QCA    May I change from ... to ...(figures and units) height above ...(datum)
QCB    Delay is being caused by ...(reason)
QCC    Unassigned
QCD    Unassigned
QCE    When may I expect approach clearance
QCF    Delay indefinite.  Expect approach clearance not later than ... hours
QCG    Unassigned
QCH    May I taxi to ...(place)
QCI    Make a 360 degree turn immediately, turning to the ...(right/left)
QCJ to QCL   Unassigned
QCM    Unassigned but see notes at the end of this list for a possible meaning.
QCN  to QCR  Unassigned
QCS    My reception on ... frequency has broken down
QCT to QCW   Unassigned
QCX    What is your full callsign
QCY    I am working on trailing aerial
QCZ    Unassigned

QDA    Unassigned
QDB    Have you sent message ... to ...(callsign)
QDC to QDE   Unassigned
QDF    What is your D-value at ...(position)
QDG    Unassigned
QDH    Unassigned but see notes at the end of this list for a possible meaning.
QDI  to QDK  Unassigned
QDL    Do you intend to ask me for a series of bearings
QDM    Indicate the MAGNETIC heading for me to steer towards you, with no wind
QDN    Unassigned
QDO    Unassigned
QDP    Will you accept control or responsibility of ... now, or at ... hours
QDQ    Unassigned
QDR    What is my MAGNETIC bearing from you, or from ...(callsign)
QDS    Unassigned
QDT    Are you flying in visual meteorological conditions (VMC)
QDU    Cancel my IFR flight plan
QDV    Are you flying in a horizontal visibility of less than ...(figures and units)
QDW    Unassigned   (Used by the Russian Military to mean:- Shall I go to/change to/ listen on a frequency of ... kHz)
QDX to QDZ   Unassigned

QEA    May I cross the runway ahead of me
QEB    May I turn at the intersection
QEC    May I make a 180 degree turn and return down the runway
QED    Shall I follow the pilot vehicle
QEE    Unassigned
QEF    Have I/you reached my/your parking area
QEG    May I leave the parking area
QEH    May I move to the holding position for runway number ...
QEI    Unassigned
QEJ    May I assume position for take-off
QEK    Are you ready for immediate take-off
QEL    May I take-off and make a ...(left/right) hand turn after take-off
QEM    What is the condition of the landing surface at ...(place)
QEN    Shall I hold my position
QEO    Shall I clear the runway or landing area
QEP to QER   Unassigned
QES    Is a right hand circuit in force at ...(place)
QET to QEW    Unassigned
QEX    Unassigned, but adopted by the American Radio Relay League in the title of its journal called "QEX incorporating Communications Quarterly".
QEY    Unassigned
QEZ    Unassigned

QFA    What is the meteorological forcast for ...(flight, route etc.)
QFB    The approach/runway/approach and runway lights are out of order
QFC    What is the amount, type and height of the cloud base above ...(datum)
QFD    Is the ... visual beacon at ...(place) in operation
QFE    What is the atmospheric pressure, at aerodrome elevation, at ...(place)
QFF    What is the atmospheric pressure, converted to mean sea level, at ...(place)
QFG    Am I overhead
QFH    May I descend below the clouds
QFI    Are the aerodrome lights lit or Please light the aerodrome lights
QFJ    Unassigned
QFK    Unassigned
QFL    Will you send up pyrotechnical lights
QFM    What height above ...(datum) should I maintain/are you maintaining
QFN    Unassigned
QFO    May I land immediately
QFP    Will you give me the latest information concerning ... at ...(place)
QFQ    Are the approach and runway lights lit
QFR    Does my landing gear appear damaged
QFS    Is the radio facility at ...(place) in operation
QFT    Between what heights above ...(datum) has ice formation been observed
QFU    What is the MAGNETIC direction or number of the runway to be used
QFV    Are the floodlights switched on or Please switch on the floodlights
QFW    What is the length of the runway in ...(figures and units)
QFX    I am working on a fixed aerial or Work on a fixed aerial
QFY    Please report the present meteorological landing conditions at ...(place)
QFZ    What is the aerodrome meteorological forecast for ...(place)

QGA    Unassigned
QGB    Unassigned
QGC    There are obstructions to the ...(left/right) of the runway
QGD    Are there any obstructions on my track that equal or exceed my altitude
QGE    What is my distance to your station or to ...(place)
QGF    Unassigned
QGG    Unassigned
QGH    May I land using ...(procedure/facility)
QGI    Unassigned
QGJ    Unassigned
QGK    What track should I make good or What track are you making good
QGL    May I enter the ...(control area/zone) at ...(place)
QGM    Leave the ...(control area/zone)
QGN    May I be cleared to land at ...(place)
QGO    Landing is prohibited at ...(place)
QGP    What is my number for landing
QGQ    May I hold at ...(place)
QGR    Unassigned
QGS    Unassigned
QGT    Fly for ... minutes on a heading that maintains a reciprocle track
QGU    Fly for ... minutes on a MAGNETIC heading of ... degrees
QGV    Do you see me or Can you see the aerodrome or Can you see ...(aircraft)
QGW    Does my landing gear appear to be down and in place
QGX    Unassigned
QGY    Unassigned
QGZ    Hold on ... direction of ... facility

QHA to QHD    Unassigned
QHE    Will you inform me when you are on ... leg of approach
QHF    Unassigned
QHG    May I enter traffic circuit at ...(figures and units) above ...(datum)
QHH    Are you making an emergency landing
QHI    Are you (or is ...) ...(waterbourne/on land)
QHJ to QHP  Unassigned
QHQ    May I make a ... approach at ...(place) or Are you making a ... approach?
QHR to QHY   Unassigned
QHZ    Shall I circle the aerodrome (or go around)?

QIA    Unassigned
QIB    Unassigned
QIC    May I establish communication with ...(callsign) on ... kHZ/MHz
QID    Unassigned
QIE    Unassigned
QIF    What frequency is ...(callsign) using
QIG to QIZ    Unassigned

QJA    Is my ...(tape/mark and space) reversed
QJB    Will you use ...(radio / cable / telegraph / teletypwriter / telphone / receiver / transmitter / reperforator)
QJC    Will you check your ...(transmitter-distributor / auto-head / perforator / printer / printer motor / keyboard / antenna system)
QJD    Am I transmitting in ...(letters/figures)
QJE    Is my frequency shift ...(too wide/too narrow/correct)
QJF    My signal as checked by monitor ...(locally/as radiated) is satisfactory
QJG    Shall I revert to automatic relay
QJH    Shall I run ...(my test tape/a test sentence)
QJI    Will you transmit a continuous ...(mark/space)
QJJ    Unassigned
QJK    Are you receiving a ...(continuous mark/continuous space/
       mark bias/space bias)
QJL to QJZ    Unassigned

QKA    I have effected rescue and am proceeding to ...(base)
QKB    Unassigned
QKC    The sea conditions at ...(place) permit ...(alighting but not take-off/extremely hazardous alighting)
QKD    Unassigned
QKE    Unassigned
QKF    May I be relieved at ... hours
QKG    Will relief take place when ...(ident) establishes ...(visual/communications) contact with survivors
QKH    Report details of the parallel sweep to be conducted
QKI  to QKL      Unassigned
QKM    Has the location of the survival craft been marked
QKN    Aircraft plotted (believed to be you) in position ... at ... hours
QKO    What other units are taking part in the operation
QKP    What pattern of search is being followed
QKQ to QKV       Unassigned
QKW    What has the rescue vessel or rescue aircraft recovered
QKX    Unassigned
QKY    Are you in the search area designated as ...(lat/long or designator)
QKZ    What is the estimated drift of the survival craft

QLA    Unassigned
QLB    Will you monitor ...(callsign) and report range, quality, etc.
QLC to QLE  Unassigned
QLF    Unassigned but unofficially and facetiously sometimes said to mean "are you sending Morse with your left foot" when the quality of the sending is poor,
       or "please send with your left foot" when the Morse is so bad that sending with the left foot could be an improvement.
QLG    Unassigned
QLH    Will you use simultaneous keying on ... frequency and ... frequency
QLI to QLU     Unassigned
QLV    Is the ... radio facility still required
QLW to QLZ   Unassigned

QMA to QMG    Unassigned
QMH    Shift to transmit and receive on ... kHz/MHz
QMI    Report the vertical distribution of cloud at ...(position)
QMJ  to QMT  Unassigned
QMU    What is the surface temperature and dew point at ...(position)
QMV    Unassigned
QMW    At what heights above ...(datum) are the zero celsius isotherms
QMX    What is the air temperature at ...(position) at ...(units and figures) height above ...(datum)
QMY    Unassigned
QMZ    Have you any amendments to the flight forecast in respect of sections of the route yet to be traversed

QNA    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Answer in prearranged order".  (This code should only be used by the Net Control Station).
QNB    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Act as relay station between ..... and .....".  (This code should only be used by the Net Control Station).
QNC    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "All net stations copy.  I have a message for all net stations".
QND    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning"Net is directed (controlled by net control station)".  (This code should only be used by the Net Control Station).
QNE    What indication will my altimeter give on landing at ...(place). Also adopted by the ARRL, for use only in CW nets, as meaning "Entire net stand by".  (This code should only be used by the Net Control Station).
QNF    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Net is free (not controlled)".
QNG    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Take over as net contol station".
QNH    What should I set on the sub-scale of my altimeter so that the instrument would indicate my elevation if I were on the ground at your station. Also adopted by the ARRL, for use only in CW nets, as meaning "Your net frequency is high".
QNI    Between what heights above ...(datum) has turbulence been observed at ...(position). Also adopted by the ARRL, for use only in CW nets, as meaning "Net stations report in" OR "I am reporting into the net". (Follow with a list of traffic or QRU).
QNJ    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Can you copy me".
QNK    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Transmit messages for ..... to .....".  (This code should only be used by  the Net Control Station).
QNL    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Your net frequency is low".
QNM    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "You are QRMing the net.  Stand by".  (This code should only be used by the Net Control Station).
QNN    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Net control station is ....." OR "What station has net control".
QNO    I am not equipped to give the information/provide the facility requested Also adopted by the ARRL, for use only in CW nets, as meaning "Station is leaving the net".
QNP    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Unable to copy you" OR "Unable to copy .....".
QNQ    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Move frequency to ..... and wait for ..... to finish handling traffic. Then send him traffic for .....".
QNR    I am approaching my point of no return. Also adopted by the ARRL, for use only in CW nets, as meaning "Answer ..... and receive traffic".  (This code should only be used by the Net Control Station).
QNS    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Following stations are in the net" (Follow with list), when used by Net Control Station OR "Request list of stations in the net", when used by other net members.
QNT    What is the maximum gust speed of the wind at ...(place). Also adopted by the ARRL, for use only in CW nets, as meaning "I request permission to leave the net for ..... minutes".
QNU    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "The net has traffic for you.  Stand by".  This code should only be used by the Net Control Station.
QNV    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Establish contact with ..... on the frequency.  If successful, move to ..... and send him traffic for .....".  (This code should only be used by the Net Control Station).
QNW    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "How do I route messages for .....".
QNX    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "You are excused from the net", when used by Net Control Station OR "Request to be excused from the net", when used by other net members.
QNY    What is the present weather, and intensity thereof, at ...(place). Also adopted by the ARRL, for use only in CW nets, as meaning "Shift to another frequency, or to .....kHz, to clear traffic with .....".  (This code should only be used by the Net Control Station).
QNZ    Unassigned, but adopted by the ARRL, for use only in CW nets, as meaning "Zero beat your signal with mine".

QOA to QOZ    The series QOA to QQZ, inclusive, have been reserved for
QPA to QPZ    the Maritime Services but no meanings have been assigned
QQA to QQZ    to date.

QRA    What is the name of your station
QRB    How far, approximately, are you from my station
QRC    What authority/administration settles the accounts of your station
QRD    Where are you bound and where are you from
QRE    What is your estimated time of arrival at ...(place)
QRF    Are you returning to ...(place)
QRG    Will you tell me my exact frequency or that of ...(callsign)
QRH    Does my frequency vary
QRI    How is the tone of my transmission
QRJ    How many radio telephone calls have you to book. (See notes at the end of this list for possible alternative meanings).
QRK    What is the intelligibility of my signals or those of ...(callsign)
QRL    Are you busy
QRM    Are you being interfered with
QRN    Are you troubled by static
QRO    Shall I increase transmitter power
QRP    Shall I decrease transmitter power
QRQ    Shall I send faster
QRR    Are you ready for automatic operation.  (Also used by the Russian Military to mean:- Shall I start working using simplex encrypted CW)
QRS    Shall I send more slowly
QRSS   Officially unrecognised code, but used by the Amateur Radio Service to mean  "Send extremely slowly"  This means speeds of one word per minute or less and is a specialised mode used in sub-noise-level communication on the VLF bands.  This mode requires special sending and decoding techniques.
QRT    Shall I stop sending
QRU    Have you anything for me
QRV    Are you ready
QRW    Shall I inform ...(callsign) that you are calling him on ... kHz/MHz
QRX    When will you call me again on ... kHz/MHz.   Must I wait
QRY    What is my turn
QRZ    Who is calling me

QSA    What is the strength of my signals or those of ...(callsign)
QSB    Are my signals fading
QSC    Are you a cargo vessel
QSD    Is my keying defective
QSE    What is the estimated drift of the survival craft.  (See notes at the end of this list for a possible alternative meaning).
QSF    Have you effected rescue.  (See notes at the end of this list for a possible alternative meaning).
QSG    Shall I send ...(number) telegrams at a time
QSH    Are you able to home on your D/F equipment.  (See notes at the end of this list for a possible alternative meaning).
QSI    Will you inform ...(callsign) that I have been unable to break in
QSJ    What is the charge to be collected to ...(callsign), including your charge
QSK    Can you hear me between your signals and, if so, can I break in
QSL    Can you acknowledge receipt
QSLL   Officially unrecognised code, but used by the Amateur Radio Service to mean "I will send you a QSL card for this contact after I receive one from you"
QSM    Shall I repeat the last telegram which I sent to you
QSN    Did you hear me or ...(callsign) on ... kHz/MHz
QSO    Can you communicate with ...(callsign) direct or by relay
QSP    Will you relay to ...(callsign), free of charge
QSQ    Have you a doctor on board or Is ...(named person) on board
QSR    Shall I repeat the call on the calling frequency.  (See notes at the end of this list for a possible alternative meaning).
QSS    What working frequency will you use
QST    Unassigned, but adopted by the American Radio Relay League to mean "CQ ARRL members".   Also the title of the ARRL's official journal.
QSU    Shall I send or reply on this frequency or on ... kHz/MHz
QSV    Shall I send a series of V's on this frequency or on ... kHz/MHz
QSW    Will you send on this frequency or on ... kHz/MHz
QSX    Will you listen to ...(callsign) on ... kHz/MHz
QSY    Shall I change to transmission on another frequency
QSZ    Shall I send each word or group more than once

QTA    Shall I cancel telegram number ...
QTB    Do you agree with my counting of words
QTC    How many telegrams have you to send
QTD    What has the rescue vessel or rescue aircraft recovered
QTE    What is my TRUE bearing from you or from ...(callsign)
QTF    Will you give me the position of my station according to the bearings taken by the D/F stations which you control
QTG    Will you send two dashes of ten seconds each followed by your callsign repeated ... times on ... kHz/MHz
QTH    What is your position in latitude and longitude (or according to any other indication)
QTHR   Officially unrecognised code, but adopted by the RSGB to mean "Name and address correct in the UK Call Book"
QTI    What is your TRUE track
QTJ    What is your speed
QTK    What is the speed of your aircraft in relation to the earth's surface
QTL    What is you TRUE heading
QTM    What is your MAGNETIC heading
QTN    At what time did you depart from ...(place)
QTO    Are you airborne or Have you left dock/port
QTP    Are you going to alight/land or Are you going to enter dock/port
QTQ    Can you communicate with my station by means of the international code of signals
QTR    What is the correct time
QTS    Will you send your callsign for tuning purposes or frequency measurement
QTT    The identification signal which follows is superimposed on another transmission
QTU    What are the hours during which your station is open
QTV    Shall I stand guard for you on the frequency of ...kHz/MHz
QTW    What is the condition of survivors
QTX    Will you keep your station open for further communication with me
QTY    Are you proceeding to the position of the incident and, if so, when do you expect to arrive
QTZ    Are you continuing the search

QUA    Have you news of ...(callsign)
QUB    Can you give me, in the following order, information concerning:- the direction in degrees TRUE and the speed of the surface wind, present weather, visibility and amount, type and height of cloud base above the surface elevation at ... (place)
QUC    What is the number or other identification of the last message you received from me or from ...(callsign)
QUD    Have you received the urgency signal sent by ...(callsign)
QUE    Can you use telephony in ...(language), with interpreter if necessary, if so, on what frequencies
QUF    Have you received the distress signal sent by ...(callsign)
QUG    Will you be forced to alight or land
QUH    Will you give me the present barometric pressure at sea level
QUI    Are your navigation lights working
QUJ    Will you indicate the TRUE track to reach you
QUK    Can you tell me the condition of the sea observed at ...(place)
QUL    Can you tell me the swell observed at ...(place)
QUM    May I resume normal working or Has the distress traffic ended
QUN    Will vessels in my immediate vicinity please indicate their position, TRUE course and speed
QUO    Shall I search for ...(aircraft/ship/survival craft) in the vicinity of...(position)
QUP    Will you indicate your position by ...(searchlight/black smoke trail/pyrotechnic lights)
QUQ    Shall I train my searchlight nearly vertical on a cloud, occulting if possible and, if your aircraft is seen or heard, deflect the beam up
       wind and on the water or land to facilitate your landing
QUR    Have survivors ...(received survival equipment/been picked up by a rescue vessel/been reached by ground rescue party)
QUS    Have you sighted survivors or wreckage.  If so in what position
QUT    Is position of incident marked
QUU    Shall I home ship or aircraft to my position
QUV    What is my MAGNETIC bearing from you or from ...(callsign)
QUW    Are you in the search area designated as ...(lat/long or designator)
QUX    Will you indicate the MAGNETIC course for me to steer towards you or ...(callsign) with no wind
QUY    Is position of survival craft marked
QUZ    Unassigned

QVA to QVZ    No "official" meanings for the series QVA to QZZ, inclusive, have
QWA to QWZ    been allocated to date, but some groups are used by the Russian
QXA to QXZ    military and the German police.  See the notes below for further
QYA to QYZ    information.
QZA to QZZ


NOTES

The ARRL has assigned "unofficial" meanings to QEX and QST and to all codes in the QNA to QNZ series.  These are included in the above list.  Also included, are
the meanings of the officially unrecognised four letter codes QRSS, QSLL and QTHR.

Chris Cramer DF5KX has a very comprehensive list of Q-Codes on his web site, which includes suggested definitions for many of the officially unassigned groups.  The only snag, for English speakers, is that his list is written in German!!

The following codes are used by the Russian Military:-

QDW    See main list above
QRR    See main list above
QWH    Shall I send on frequency ... kHz
QYR    Shall I start working on 81Baud RTTY
QYS    Shall I start working on duplex radiotelephony
QYT    Shall I start working on MS-5 multiplex

The following codes are used by the German Police:-

QZE    Your frequency is high.  Decrease your frequency
QZF    Your frequency is low.  Increase your frequency
QZP    You have/I have transmitter trouble
QZT    You have/I have receiver trouble
QZY    You are unreadable

Robert Harris, in his book "Enigma", states that QRJ, QWP, QXA, QXH and QZE have the meanings stated below, but the authenticity of these definitions is open to
debate. However, the stated meaning of QZE is similar to that in German Police usage.

QRJ    Your signals are too weak
QWP    Observe Regulations
QXAn   My message consists of n cipher groups
QXH    Broadcast your traffic
QZE    Your frequency is too high

Bob Zinn, N5BZ, has suggested the following alternative meanings, but he is unable to determine the exact source for these, although he thinks they come from an
American Merchant Marine publication.

QBT    Am I missing dots
QCM    Is there a defect in my transmission
QDH    What is causing the present interference
QRJ    Are you receiving me badly
QSE    Are my signals distinct
QSF    Are my automatic transmissions good
QSH    Must I send one telegram at a time, repeating it twice
QSR    Has the distress call from ... been attended to?

by G3NPF and M1AIM
http://homepages.tesco.net/~a.wadsworth/