C100. OPERATING SIGNALS ("Q" AND "Z")

• a. Operating signals are concise codes designed primarily for use by communication personnel in exchanging information incident to the handling of messages or in establishing communications. Communication personnel also use them in service messages.
• b. Operating signals provide no security and therefore must be regarded as the equivalent of plain language.
• c. The "Z" signals are designed to cover military requirements and should be used whenever necessary in military communications. "Q" signals may be used in military communications where no suitable "Z" signal exists. Only "Q" signals will be used in non­military communications.
• d. Meaning of "Q" and "Z" operating signals may be amplified or completed by the addition of appropriate call signs, time groups, complementary groups, etc. Call signs used to complement an operating signal normally follow the signal, but under certain conditions, such as to achieve clarity or to effect separation, they may be placed ahead of the operating signal. Plain language is prohibited except when no other method is provided to complete the meaning.
• e. When desired, an operating signal may be given an interrogative sense:
  • (1) When communicating with military stations, by inserting the prosign INT before the "Q" or "Z" signal.
  • (2) When communicating with non­military stations, by inserting the prosign INT after the "Q" signal and data used with it.
• f. Operating signals should not normally be used in radiotelephone procedure. Instead, the operating information will be conveyed by concise phrases. When it is necessary to relay operating signals over voice circuits, they are transmitted by their phonetic equivalents.
• g. Use of the prosign ZWC is prohibited on radio circuits when it indicates operator­to­operator "chatter," which constitutes an unauthorized transmission.
• h. Blank spaces in the meaning of "Q" and "Z" signals will be completed in the order in which they appear; however, blank spaces enclosed in parenthesis normally will be completed on an optional basis only.
  • Example One: QBM NNNØAAA 1Ø1ØZ means: "Here is the message sent by NNNØAAA at 1Ø1ØZ hours." Note: The meaning assigned QBM is "Here is the message sent to....at... hours", therefore, as these blank spaces are not enclosed in parenthesis, all are completed in the order in which they appear.
  • Example Two: ZKO NNNØAAA means: "I have handed over guard (to...) (on...KHz or MHz) (serial number of last message received was...)". However, in this example, the user elected to complete only one of the blank spaces enclosed in parenthesis.

Q Signals

• INT QAP Shall I listen for you (or for...) on KHz on ...KHz (...MHz)? Note: if the frequency is given in megahertz, the abbreviation MHz to be is to be used. (See also signal QSX).
• QAP Listen for me (or for ...) on ...KHz (...MHz). Note: if the frequency is given in megahertz, the abbreviation MHz is to be used. (See also signal QSX.)

• INT QBM Has ...sent any message for me?
• QBM Here is the message sent by ... at ...

• QCS My reception on ...frequency has broken down.

• INT QCX What is your full call sign?
• QCX Use your full call sign until further notice.

• INT QDB Have you sent message ... to ...?
• QDB I have sent message ... to ...

• INT QIC May I establish communication with ... radio station on ...KHz (or ...MHz) now (or at ...hours)?
• QIC Establish communication with ... radio station on ... KHz (or ...MHz) now (or at ...hours) or I will establish communications with ... radio station on ...KHz (or ...MHz).

• INT QIF What frequency is ... using ?
• QIF ... is using frequency ... KHz (or ...MHz).

• INT QJG Shall I revert to automatic relay?
• QJG Revert to automatic relay.

• INT QJH Shall I run ... 1) my test tape? 2) a test sentence?
• QJH Run ... 1) your test tape; 2) a test sequence.

• INT QJI Will you transmit a continuous ... 1) mark? 2) space?
• QJI I am transmitting a continuous ... 1) mark 2) space.

• INT QJK Are you receiving ... 1) a continuous mark? 2) a continuous space? 3) a mark bias? 4) a space bias?
• QJK I am receiving ... 1) a continuous mark; 2) a continuous space; 3) a mark bias; 4) a space bias.

• QMH Shift to transmit and receive on ...KHz (or ...MHz); if communication is not established within 5 minutes, revert to present frequency.

• INT QRA What is the name of your station?
• QRA The name of my station is ...

• INT QRB How far approximately are you from my station?
• QRB The approximate distance between our stations is ... nautical miles (or ...kilometers).

• INT QRG Will you tell me my exact frequency (or that of...)?
• QRG Your exact frequency (or that of ...) is ...KHz (or ...MHz).

• INT QRH Does my frequency vary?
• QRH Your frequency varies.

• INT QRI How is the tone of my transmission?
• QRI The tone of your transmission is ... 1) good; 2) variable; 3) bad.

• INT QRK What is the intelligibility of my signals (or those of ...)?
• QRK The intelligibility of your signals (or those of ...) is 1)bad; 2) poor; 3) fair; 4) good; 5) excellent.

• INT QRL Are you busy?
• QRL I am busy (or I am busy with ...). Please do not interfere.

• INT QRM Are you being interfered with?
• QRM I am being interfered with ... 1) nil; 2) slightly; 3) moderately; 4) severely; 5) extremely.

• INT QRN Are you troubled by static?
• QRN I am troubled by static 1) nil; 2) slightly; 3) moderately; 4) severely; 5) extremely.

• INT QRO Shall I increase transmitter power?
• QRO Increase transmitter power.

• INT QRP Shall I decrease transmitter power?
• QRP Decrease transmitter power?

• INT QRQ Shall I send faster?
• QRQ Send faster (...words per minute).

• INT QRR Are you ready for automatic operation?
• QRR I am ready for automatic operation. Send at ...words per minute.

• INT QRS Shall I send more slowly?
• QRS Send more slowly (...words per minute).

• INT QRT Shall I stop sending?
• QRT Stop sending.

• INT QRU Have you anything for me?
• QRU I have nothing for you.

• INT QRV Are you ready?
• QRV I am ready.

• INT QRW Shall I inform ...that I am calling him on ... KHz (or MHz).
• QRW Please inform ...that I am calling him on ...KHz (or MHz).

• INT QRX When will you call me again?
• QRX I will call you again at ... hours on ... KHz.

• INT QRZ Who is calling me?
• QRZ You are being called by ... on ...KHz (or MHz).

• INT QSA What is the strength of my signals (or those of ...)?
• QSA The strength of your signals (or those of ...) is ... 1) scarcely perceptible; 2) weak; 3) fairly good; 4) good; 5) very good.

• INT QSB Are my signals fading?
• QSB Your signals are fading.

• INT QSG Shall I send ...telegrams at a time?
• QSG Send ...telegrams at a time.

• INT QSK Can you hear me between my signals and if so can I break in on your transmission?
• QSK I can hear you between my signals; break in on my transmission.

• INT QSL Can you acknowledge receipt?
• QSL I am acknowledging receipt.

• INT QSN Did you hear me (or ...(call sign)) on...KHz (or MHz)?
• QSN I did hear you (or ... (call sign)) on ...KHz (or MHz).

• INT QSO Can you communicate with ... direct (or by relay through...)?
• QSO I can communicate with ... direct (or by relay through ...).

• INT QSP Will you relay to ... free of charge?
• QSP I will relay to ... free of charge.

• INT QSR Shall I repeat the call on the calling frequency?
• QSR Repeat your call on the calling frequency; did not hear you (or have interference).

• INT QSU Shall I send or reply on this frequency (or on...KHz (or MHz)) with emissions of class ...)?
• QSU Send or reply on this frequency (or on ...KHz (or MHz)) (with emissions of class ...).

• INT QSV Shall I send a series of V's on this frequency (or...KHz (or MHz))?
• QSV Send a series of V's on frequency (or on ...KHz (or MHz)).

• INT QSW Will you send on this frequency (or on...KHz (or MHz)) (with emissions of class...)?
• QSW I am going to send on this frequency (or on ...KHz (or MHz)) (with emissions of class ...).

• INT QSX Will you listen to ... (call sign(s)) on ...KHz (or MHz)?
• QSX I am listening to ... (call sign(s)) on ... KHz (or MHz).

• INT QSY Shall I change to transmission on another frequency?
• QSY Change to transmission on frequency ... KHz (or MHz).

• INT QSZ Shall I send each word or group twice (or ... times)?
• QSZ Send each word or group twice (or ... times).

• INT QTA Shall I cancel telegram number ...?
• QTA Cancel telegram number ...

• INT QTC How many telegrams do you have to send?
• QTC I have ... telegrams for you (or for...).

• INT QTH What is your position in latitude and longitude (or according to any other indication)?
• QTH My position is ... latitude, ... longitude (or according to any other indication).

• INT QTR What is the correct time?
• QTR The correct time is ... hours.

• INT QTS Will you send your call sign for tuning purposes or so that your frequency can be measured now (or at...hours) on...KHz (or MHz)?
• QTS I will send my call sign for tuning purposes or so that frequency may be measured (or at ... hours) on ... KHz (or MHz).

• INT QTX Will you keep your station open for further communication with me until further notice (or until...hours)?
• QTX I will keep my station open for further communication with you until further notice (or until ... hours).

• INT QUC What is the number (or other indication) of the last message you received from me or from...(call sign))?
• QUC The number (or other indication of the last message I received from you (or from ... (call sign) is ...

Z Signals

• ZAA You are not observing proper circuit discipline.

• ZAD Your operating signal (made at...) received as ... 1) not understood; 2) not held.

• INT ZAF Will you patch me to ...(via you or ...)?
• ZAF I am about to patch you through to ... (via ...).

• ZAH Unable to relay message ... in present form because 1) not in prescribed format; 2) format lines are incorrect; 3) No on-line facility available; 4) call signs not encrypted; 5) text not encrypted. We file. Transmit correctly prepared message to all addressees (or to...).

• ZAJ I have (or ... has) been unable to break you.

• ZAK Transmission on ... KHz (or ... MHz) suspended until ... (or was suspended at ...) on account of electrical hazards (or...).

• ZAL I am closing down (until..) due to...

• ZAN Transmit only messages of and above precedence ...

• ZAQ The last word (or group) 1) received from you was...; 2) transmitted to you was ...).

• ZAR This is my ... request (or reply). 1) first; 2) second; 3) third; etc.

• ZAX You are ... 1) causing interference. Listen before sending; 2) causing interference by inattention to order to wait; 3) sending at the same time as ... (call sign); 4) causing delay by slowness in answering; 5) causing delay by slowness in answering my service or procedure messages; 6) answering out of turn).

• ZAY Transmit traffic to me (or to ... on ... KHz (or MHz)) without waiting for receipts. I (or ...) will receipt for traffic later (on...KHz (or MHz)).

• INT ZBA What is cause of delay (or of bad transmission)?
• ZBA Delay (or bad transmission) due to ...

• ZBC You are transmitting a continuous ... 1) mark; 2) space.

• INT ZBD Will you repeat what you (or...) sent (at...)?
• ZBD Following is what I (or ...) sent (at ...).

• ZBE Retransmit message ... to .. for ... 1) action; 2) information.

• ZBG You are transmitting in upper case.

• ZBH Make preliminary call before transmitting traffic.

• ZBI Listen for radiotelephony.

• INT ZBK Are you receiving my traffic clear?
• ZBK I am receiving your traffic ... 1) clear; 2) garbled.

• ZBL I am unable to receive you while I am transmitting. Do not use break­in procedure.

• ZBM Place ... on watch on this frequency: 1) a qualified speed key operator; 2) a competent operator.

• ZBN Your ... is reversed. 1) tape; 2) mark and space.

• INT ZBO Of what precedence(s) and for whom is (are) your message(s)?
• ZBO I have (or ... has) ... (numeral followed by precedence prosign for each message(s) for ...).

• ZBP Your ... 1) characters are indistinct; 2) spacing is bad.

• INT ZBQ When and on what frequency was message ... received?
• ZBQ Message ... was received at ... on ... KHz (or MHz).

• ZBU Report when you are in radio communication with ...
• ZBV Answer me (or...) on...KHz (or MHz).

• INT ZBW Will you shift (or ask ... to shift) to transmit on ... KHz (or MHz)?
• ZBW I am (or ... is) shifting to transmit on ... KHz (or MHz).

• INT ZBX Will you shift (or ask ... to shift) to receive on...KHz (or MHz)?
• ZBX I am (or ... is) shifting to receive on ... KHz (or MHz).

• ZDA I have a formal message for you (precedence is ...).

• ZDB Expedite reply(ies) to my ... 1) previous operating signal; 2) request(s) for repetition and correction; 3) service message ...).

• ZDD Bring message ... to the circuit.

• ZDE Message ... undelivered ... 1) will continue efforts to effect disposal; 2) advise disposition; 3) will not continue further efforts: request cancel and file; 4) give more complete address.

• ZDF Message ... was 1) received by addressee(s) at ...Z; 2) received by addressee(s) at communications center at ...Z; 3) delivered to addressee(s) by broadcast at ...Z; 4) forwarded to addressee(s) by commercial means at ...Z; 5) mailed to addressee(s) at ...Z.

• ZDG Accuracy of following message(s) or message ...) is doubtful. Correction or confirmation will be forthcoming.

• ZDH Request corrected copy of message ... be forwarded to ...

• INT ZDK Will you repeat message ... (or portion ...) (or will you rerun number ...)?
• ZDK Following repetition (of ...) is made in accordance with your request.

• ZDL Confirmation ... 1) was omitted; 2) differs from text).

• ZDM I am holding your message ...

• ZDN Report disposal of message ... your station with any reason for delay.

• ZDO I could not send message ... to ...

• ZDQ Message ... was relayed to ... at ... by ... (on ...KHz (or MHz)).

• ZDR This is a multiple­address or book message tape containing ... routing indicators in the routing line which is to be routed in accordance with the established doctrine.

• ZDS Message (or message ...) which you have (or ... has) just forwarded was incorrectly transmitted. Correct version of message (or part or portion ...) is ...

• INT ZEC Have you received message ...?
• ZEC Message ... 1) not received; 2) unidentified: give better identifying data.

• ZED The following confirmatory information as received is at variance with the text.

• ZEE Request message ... be transmitted.

• ZEH Accuracy of ... portion of following message (or message ...) is doubtful. Correction or confirmation will be forwarded when received. 1) heading; 2) text; 3) group ... to ...)

• ZEI Accuracy is doubtful of heading of message received as follows ... Check to station of origin if necessary and repeat.

• ZEJ Replies to this message (or message ...) are to be sent now (or at ...).

  ZEK No answer is required.

• INT ZEL Is message ... a correction (to message...) which was previously transmitted with doubtful or missing groups (words)?
• ZEL This message is a correction (to message ...) (transmitted by ...). Note - may only be used in conjunction with ZDG.

• ZEN This message has been delivered by a separate transmission or by other means 1) messenger or courier; 2) mail to the addee(s) immediately following this operating signal.

• ZEQ Message ... (or this message) has been ... 1) missent to this station; received at ...Z; 2) missent to this station and unable to protect delivery due to... Request you retransmit to the appropriate called station(s); 3) mis-routed to this station and has been re-routed to ... at ....Z. Recommend corrective action; 4) Misrouted to this station and unable to protect delivery (for ...) due to ...; request your station protect delivery; 5) Routed to this station in format line 2, but without delivery responsibility in format lines 7 or 8. Advise; 6) Delayed due to misrouting, and is being retransmitted herewith.

• ZER This is a multiple­address or book message tape containing ... routing indicators in the routing line for which the station called in the pilot is responsible.

• ZES Your message ... has been received ... 1) incomplete; 2) garbled. Request retransmission.

• ZET Message ... has been protected and no further action by ... is required.

• ZEU Exercise (drill) message.

• INT ZEV Request you acknowledge message ...
• ZEV Message (...) is acknowledged.

• ZEW Your attention is invited for ... 1) action; 2) information to message ... which is in your files.

• ZEX This is a book message and may be delivered as a single­address message to addees for whom you are responsible.

• ZEZ When delivery is effected of this book message to addee by commercial means, or when copy is forwarded to confirm message previously delivered by telephone, it is to be sent as a single address message. (May only be used in conjunction with ZEX.)

• ZFA Following message has been read (received or intercepted).

• ZFB Pass this message to ... 1) on arrival; 2) on return to base.

• ZFD This message is a suspected duplicate.

• ZFE Pass message ... (which is in your files) to addee(s) for whom you are responsible using the indicated supplementary heading.

• ZFF Inform me when this message (or message ...) has been received by ... (addee designation) or by ... 1) action addee(s); 2) information addee(s); 3) all addees; 4) action addee message center; 5) information addee message center; 6) all addees' message center).

• ZFG This message is an exact duplicate of a message previously transmitted, and is to be delivered to all appropriate addressed served by the receiving communications facility.

• ZFH This message (or message ...) is being (or has been) passed to you (or ...) for ... 1) action; 2) information; 3) comment (at the request of ...).

• INT ZFI Is there any reply to message ...?
• ZFI There is no reply to message ...

• INT ZFK Does message ... (or station serial number ...) concern me (or ...)?
• ZFK Message ... (or station serial number ...) 1) does not concern you (or ...); 2) no longer concerns you (or ...).

• INT ZFL Was there any traffic addressed to me on ... broadcast schedule between serial numbers ... and ...?
• ZFL Following traffic was addressed to you on ... broadcast schedule between serial numbers ... and ...

• ZFR Cancel transmission ... (made under channel or station serial number ...).

• ZFS Make message ... same channel or station serial number as this procedure message.

• ZFT Message ... received without channel number (or station serial number) following message bearing channel number (or station serial number) ... Message released.

• ZFU Channel numbers ... and ... preceded message ... The lower number was recorded and higher number blanked.

• ZFV Message ... containing channel number ... separated by portions of the message, released subject to correction. Take necessary action to provide corrected copy.

• ZFW BLANK channel number(s) ...; forward message ... as channel number ...

• ZFX Channel number (or station serial number) ... is open.

• INT ZGA What is my call sign for use on this circuit?
• ZGA Your call sign for use on this circuit only is ...

• ZGB Send (answer) ... 1) in alphabetical sequence of call signs; each station to make its call signs once (or ... times); 2) in the following sequence of call signs).

• ZGE Send your call sign(s) once (or ... times) on this frequency or on ... KHz (or MHz).

• ZGI I am or have been (or ... is or has been) calling you (on ... KHz (or MHz)).

• INT ZGJ When will you call me again on present frequency (or on ...KHz (or MHz))?
• ZGJ I will call you again as soon as possible (or at ...) on present frequency (or on ... KHz (or MHz)).

• INT ZGK When shall I call you on present frequency (or on ...KHz (or MHz))?
• ZGK Call me again at ... on present frequency (or on ... KHz (or MHz).

• ZGL ... will answer calls for me (or for ...).

• INT ZGM Did you (or...) hear... (at ...)?
• ZGM I have (or ...) has been unable to communicate with ... (since ...).

• INT ZGN When was I (or...) last heard?
• ZGN Nothing heard from you (or ...) (since ...).

• ZGP Answer calls for me on present frequency (or on ... KHz (or MHz)).

• INT ZHA Shall I decrease frequency very slightly (or ... KHz) to clear interference?-
• ZHA Decrease frequency very slightly (or ...KHz) to clear interference.

• INT ZHB Shall I increase frequency very slightly (or ... KHz) to clear interference?
• ZHB Increase frequency very slightly (or ...KHz) to clear clear interference.

• INT ZHN How do you receive my automatic transmission?
• ZHN Your automatic transmissions are ... 1) good; 2) fair; 3) unreadable.

• INT ZHO What is your speed of transmission in ... 1) revolutions per minute; 2) words per minute; 3) bauds.
• ZHO My speed of automatic transmission in ... 1) revolutions per minutes; 2) words per minute; 3) bauds

• INT ZHP What is preventing automatic reception?
• ZHP Automatic reception is prevented by ...

• ZHQ Please listen for me on ...KHz (or MHz) and transmit to me on ...KHz (or MHz).

• INT ZHR Is my speed of automatic transmission correct?
• ZHR Your speed of automatic transmission is ... 1) fast; 2) slow; 3) erratic; 4) correct).

• ZIA This message (or message ...) is being (or has been) passed out of proper sequence of station serial number ...

• INT ZIB Two messages ... and ... (or group counts and time of origin ... and ...), both received as serial number ... What are correct serial numbers?
• ZIB Change station serial number of message ... to read number ... OR assign to message ... station serial number ...

• INT ZIC What is (are) station serial number(s) or channel number(s) of last message(s) you transmitted to me (or to...)?
• ZIC Station serial number(s) or channel number(s) of last message(s) received from you (or from ...) is (are) ...

• INT ZID What is (are) station serial number(s) or channel number(s) of last message(s) received from me (or from...)?
• ZID Station serial number(s) or channel number(s) of last message(s) received from you (or from ...) is (are) ...

• ZIE Station serial number(s) or channel number(s) (from ...) has (have) not been received. Repeat message(s) or cancel serial number(s) or channel number(s).

• ZIF I (or ...) did not use serial number(s).

• INT ZIG Is (are) number(s) ... (to ...) blank?
• ZIG Number(s) ... (to ...) is (are) blank.

• ZIH Repeat headings of message numbers ... to ... transmitted by you (or ...) to check serial numbers.

• INT ZII What was ... of your (or ...'s) number ...? 1) Date­time-group; 2) filing time.
• ZII My (or ...'s) number ... had following ... 1) date-time-group; 2) filing time.

• ZIJ I am now changing my channel number/letter. Last number sent in this series is that of this message.

• ZJO Repeat back each group of the text of this message as it is transmitted.

• INT ZKA Who is controlling station (net control station on this frequency (or on ...KHz (or MHz))?
• ZKA I am (or ... is) controlling station (net control station) on this frequency (or on ... KHz (or MHz)).

• INT ZKB Is it necessary to obtain the permission of the controlling station) before transmitting messages.
• ZKB It is necessary to obtain the permission of the controlling station (net control station) before transmitting messages.

• ZKC Substitute code sign (call sign) of control station of group (net) in place of this operating signal.

• INT ZKD Shall I take control of net (for ...) (until ...)?
• ZKD Take control of net (for ...) (until ...)

• ZKE I (or ...) report(s) into circuit (net).

• ZKF Station leaves net temporarily (or for ... minutes) (to communicate with ...) (will be on ...KHz (or MHz)).

• ZKG Observe (or direct ...to observe) schedule with ... on ...KHz (or MHz) (at...).

• INT ZKH Did you (or...) observe schedule with ... (at ...)? ZKH I (or ...) observed schedule with ... (at ...).

• INT ZKJ May I close down (until ...)?
• ZKJ ... 1) close down (until...); 2) I am closing down (until ...).

• ZKL Resume normal radio communication now (or at ...).

• ZKM Take guard (for ...) (on ...KHz (or MHz)).

• ZKN I have taken over guard on ...KHz (or MHz).

• ZKO I have handed over guard (to ...) (on ...KHz (or MHz)) (serial number of last message received was ...).

• INT ZKR On what frequencies are you (or ...) maintaining watch?
• ZKR I am (or ... is) maintaining watch on ...KHz (or MHz).

• INT ZKS What stations are keeping watch on ... KHz (or MHz) (or in net)?
• ZKS Following stations are keeping watch on ... KHz (or MHz) (or are in net).

• ZOB Take (I will take) no further action regarding forwarding message ...

• ZOC Station(s) called relay this message to addees for whom you are responsible.

• ZOD Act as radio link (relaying station) between me and ... (or between ... and ...).

• INT ZOE Can you accept message for...? 1) on line; 2) off line.
• ZOE Give me your message. I will dispose of it ... 1) on line; 2) off line.

• ZOF Relay (pass) this message (or message ...) to ... now (or at ...).

• ZOG Transmit (pass) this message (or message ...) to ... (for ...) 1) action; 2) information.

• ZOH Send message for ... on ... KHz (or MHz) by ... 1) receipt method; 2) broadcast method; 3) intercept method.

• ZOR 1. Route traffic for ... via ... area broadcast. 2. Beginning at ... traffic for you (or ...) will be routed via ... area broadcast.

• INT ZOS Request area routing for messages ...?
• ZOS Area routing for messages ... is ...

• ZOT Transmit or handle this message at the lower precedence to the station or address designator(s) which follow(s).

• INT ZOU How should traffic for ... be routed?
• ZOU Route traffic for ... through ... (on ...KHz (or MHz)).

• ZOV Station designation preceding this operating signal is the correct routing for this message rerouted by ...

• ZPA Your speech is distorted.

• ZPC Your signals are ... 1) fading badly; 2) fading slightly; 3) good for ... words per minute; 4) getting stronger; 5) getting weaker.

• ZPE Maximum power is now being radiated.

• INT ZPF What is the readability of the signals of the group (net) (or of ...)?
• ZPF The readability of the signals of the group (net) (or of ...) is ... (1 to 5).

• INT ZPG What is (are) signal strength(s) of group (net) (or of ...)?
• ZPG Signal strength(s) of group (net) is (are) (or of...) is... (1 to 5).G

• ZPO The text of this message is to be relayed in precisely the same format as that in which it is received. No characters or machine functions are to be added, inserted or deleted and the relative positions of the groups are to be retained.

• ZPW This message canceled at time indicated. File without further transmission.

• INT ZRA How does my frequency check?
• ZRA Your frequency is ... 1) correct; 2) slightly (or ... hertz (or KHz)) high; 3) slightly (or ... hertz (or KHz)) low; 4) stable on steady mark; 5) stable on steady space; 6) unstable; 7) erratic.

• ZRB Check your (or ...'s) frequency on this circuit (or on ...KHz (or MHz)).

• INT ZRC Shall I tune my transmitter to ... 1) proper frequency; 2) zero beat with your (or ...) transmitter)?
• ZRC Tune your transmitter to ... 1) proper frequency; 2) zero beat with my (or ...) transmitter.

• INT ZRE On what frequency do you hear me best?
• ZRE I hear you best on ...KHz (or MHz).

• INT ZRF Will you send tuning signal on your present frequency (or on ... KHz (or MHz)) for one minute or until AS is given?
• ZRF Am about to send tuning signal on my present frequency (or on ...KHz (or MHz)).

• INT ZRG When will a change of frequency (to ... KHz (or MHz)) be necessary?
• ZRG A change in frequency (to ...KHz (or MHz)) will be necessary at approximately ...

• INT ZRJ Will you check your ...?
• ZRJ I will check my ...

• INT ZRN Do you intend to transmit on ... 1) the upper sideband; 2) the lower sideband; 3) both sidebands independently?
• ZRN I intend to transmit on ... 1) the upper sideband; 2) the lower sideband; 3) both sidebands independently?

• ZRQ Change to other sideband.

• ZRR Message(s) ... number(s) ... will no longer be broadcast but are effective and of interest (to units indicated).

• ZRS Your carrier is ... 1) Over-suppressed; 2) under­suppressed.

• ZRT Radiate full unmodulated power for ... minutes.

• INT ZRU Are my tone frequencies correct?
• ZRU Your tones for ... 1) marking and spacing are high; 2) marking and spacing are low; 3) marking and spacing are correct.

• ZSO Send tapes (or messages) ... 1) once; 2) twice.

• ZTA ... 1) radio; 2) visual; 3) landline; 4) teletypewriter (teleprinter); 5) telephone; 6) automatic; 7) facsimile; 8) shore telephone; 9) shore teleprinter; 10) radio teletypewriter; 11) satellite.

• ZTB ... 1) transmitter­distributor; 2) auto­head; 3) perforator; 4) reperforator; 5) printer; 6) undulator; 7) keyboard; 8) frequency shift keyer; 9) multiplexing carrier base; 10) on line crypto device.

• INT ZTC ...(1. Does my ... appear to be faulty?; 2. Is your ... faulty? ZTC ... (1. Your ... appears to be faulty; 2. my ... is faulty).

• INT ZTD Shall I use ...?
• ZTD Use ...

• INT ZTE Are you (or is ...) able to use ...?
• ZTE I am (or ... is) able to use ...

• INT ZTF Are repairs completed?
• ZTF Repairs completed.

• ZTJ Cease using ...

• INT ZTK Are you (or is ...) connected to ...?
• ZTK I am (or ...is) connected to ...

• INT ZTL Are you (or is ...) about to disconnect?
• ZTL I am (or ... is) about to disconnect.

• ZTM I am (or ... is) unable to use ...

• ZUB At ...

• ZUC From ... to ...

• ZUD Until further orders (or until ...)

• ZUE Affirmative (Yes).

• ZUG Negative (No).

• ZUH Unable to comply.

• ZUI Your attention is invited to ...

• ZUJ Stand by.

• ZWF Incorrect.

• ZWG You are correct.

• ZWH Try again.

• ZXW This message has been delivered to all action addresses whose designations follow this operating signal.

• ZXX This message has been delivered to all information addresses whose designations follow this operating signal.

• ZXY Transmit this message to the address(es) indicated by the numeral(s) following ... All addresses are to be counted consecutively as they appear (numbers to be separated by the Separative Sign).
  

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