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 ZAA

You are not observing proper circuit discipline.

ZAL

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

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).

ZBE

Retransmit message...to... (for...)(1. Action; 2. Information).

ZBH

Make preliminary call before transmitting traffic.

ZBK

Are you receiving my traffic clear?

I am receiving your traffic... (1. Clear; 2. Garbled).

ZBL

I am unable to receive you while I am transmitting. Do not use break-in procedure.

ZBO

Of what precedence(s)? I have (or...has)...(numeral followed by precedence prosign for each precedence) message(s) for you (or for...).

ZBU

Report when you are in radio communication with...

ZDA

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

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 received by...(addressee designation) at...Z or was (1. Received by action addressee(s) at...Z; 2. Received by information addressee(s) at...Z; 3. Received by all addressees at...Z; 4. Received by action addressee(s) message center at...Z; 5. Received by information addressee(s) message center at...Z; 6. Received by all addressees' message center at...Z; 7. Delivered by broadcast at...Z; 8. Forwarded by commercial means at...Z; 9. Mailed 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...

ZDK

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

ZDO

I could not send message...to...

ZDQ

Message...was relayed to...at... by...(on...kHz (or MHz)).

ZEK

No answer is required.

ZEN

This message has been delivered by a separate transmission or by other means (1. Messenger/courier; 2. Mail) to the addressee(s) immediately following this operating signal.

ZEO

Transmit this message by rapid means when no charges are involved and to all others by mail.

ZEQ

Your message...has been missent to this station...(1. Request you retransmit to correct addressee; 2. I will retransmit to correct addressee).

ZES

Your message...has been received...(1 Incomplete; 2. Garbled). Request retransmission.

ZEU

Exercise (drill) message.

ZEV

Request you acknowledge Message (or message...) is message... 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 single-address message to addressees for whom you are responsible.

ZFD

This message is a suspected duplicate.

ZFE

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

ZFF

Inform me when this message (or message...) has been received by... (addressee designation) or by... (1. Action addressee(s); 2. Information addressee(s); 3. All addressee(s); 4. Action addressee's/ addressees' message center; 5. Information addressee's/addressees' message center; 6. All addressees' message center).

ZFG

This message is an exact duplicate of a message previously transmitted.

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...)

ZFR

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

ZGE

Send your call sign(s) once (or... times) on this frequency (or on ...kHz (or MHz)).

ZGP

Answer calls for me on present frequency (or on...kHz (or MHz)).

ZHA

Shall I decrease frequency Decrease frequency very slightly (or very slightly (or...kHz) ...kHz) to clear interference. to clear interference?

ZHB

Shall I increase frequency Increase frequency very slightly (or very slightly (or...kHz) ...kHz) to clear interference. to clear interference?

ZHQ

Please listen for me on...kHz (or MHz) and transmit to me on...kHz (or MHz).

ZIC

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

ZID

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

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).

ZJN

Message...has been passed to those for whom I am responsible (or to...) (at...) but "L" has not been received.

ZJO

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

ZKA

Who is controlling station (net control station) on this frequency (or on... kHz (or MHz))?

I am (or...is) controlling station (net control station) on this frequency (or on...kHz (or MHz)).

ZKB

Is it necessary to obtain the permission of the controlling station (net control station) before transmitting messages?

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.

ZKD

Shall I take control of net Take control of the net (for...) (for...) (until...)? (until...).

ZKE

I (or ...) report(s) into the 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...).

ZKH

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

ZKI

Set watch on...kHz (or MHz)... (1. Continuous; 2. Until further notice).

ZKJ

May I close down (until...)? 2. I am closing down (until...))

...(1. Close 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...

ZKP

Are you (or is...) radio guard I am (or...is) radio guard for... for... (on...kHz (or MHz))? (on...kHz (or MHz)).

ZKR

On what frequencies are you I am (or...is) maintaining watch on (or...) maintaining watch? ...kHz (or MHz)).

ZKS

What stations are keeping Following stations are keeping watch on...kHz (or MHz) (or on...kHz (or MHz) (or are in net). are in net)?

ZKT

Am keeping watch on...kHz (or MHz) for...(1. First five minutes in each half hour; 2. From 10 to 15 and 40 to 45 minutes past the hour; 3. Between...and...minutes past the hour).

 ZKU

I am (or...is) maintaining continuous watch, or (1. Single operator period; 2. Two operator period; 3. General periods only; 4. Reduced single- operator period) on...(call sign)... Broadcast.

ZKV

I am (or...is) standing split phone watch on...and...kHz (or MHz).

ZLN

Facility indicated cannot be operated at present.

ZNB

What is authentication of... 1. Message; 2. Last transmission; 3. ...)?

Authentication (of...) is... (1. Message...; (2. Last transmission; 3. ...).

ZNC

All transmissions will be authenticated...(1. On all circuits; 2. On this circuit; 3. On...frequency).

ZND

You are using authenticator incorrectly...(1. Verify authenticator system key; 2. Check authentication of your last transmission).

ZNE

I am prepared to authenticate.

ZNQ

This message (or message...) received at this station... (1. Without authentication (when authentication is in force); 2. Incorrectly authenticated).

ZNR

This message may be forwarded without change by radio or non-approved circuit.

ZOB

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

ZOC

Station(s) called relay this message to addressees for whom you are responsible.

ZOD

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

ZOE

Can you accept message for...? (1. On-line; 2. Off-line).

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).

ZOK

Relay this message via...

ZOM

Delivery of this message by mail in lieu of broadcast permissible (to...).

ZOP

This message (or message...) has been delivered to all broadcast areas (or to the following specific broadcast area(s)...).

ZOQ

Deliver this message (or message...) to all broadcast areas (or to the following specific broadcast area(s)...).

ZOR

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

ZOS

Request area routing for messages for...

Area routing for messages for... is...

ZOT

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

ZOU

How should traffic for... be routed?

Route traffic for...through...(on... kHz (or MHz)).

ZOV

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

ZOY

Relay this message only to the station(s) whose designation(s) precede this operating signal.

ZPA

Your speech is distorted.

ZPB

Your transmitter has strong radiation while idling.

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.

ZPF

What is the readability of the signals of the group (net) (or of...)?

The readability of the signals of the group (net) (or of...) is... (1 to 5).

ZPG

What is (are) signal strength(s) of group (net) (or of...)?

Signal strength(s) of the group (net) (or of...) is... (1 to 5).

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.

ZPT

This transmission is a transmitter pre-acceptance trial. Request expeditious strength and readability reply.

ZPW

This message cancelled at time indicated. File without further transmission.

ZRA

How does my frequency check?

Your frequency is...(1. Correct; 2. Slightly (or...Hz (or kHz)) high; 3. Slightly (or...Hz (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)).

ZRC

Shall I tune my transmitter? (1. Proper frequency; 2. Zero beat with your (or...) transmitter).

Tune your transmitter to... (1. Proper frequency; 2. Zero beat with my transmitter (or...) to...

ZRD

What is the frequency of the... radio facility now in operation?

The frequency of the...radio facility now in operation is...

ZRE

On what frequency do you hear me best?

I hear you best on...kHz (or MHz).

ZRF

Will you send tuning signal on your present frequency (or on...kHz (or MHz)) for one minute or until AS is given?

Am about to send tuning signal on my present frequency (or on...kHz (or MHz)).

ZRG

When will a change of frequency (to...kHz (or MHz)) be necessary?

A change in frequency (to...kHz (or MHz)) will be necessary at approximately...

ZRH

Is my frequency shift correct?

Your frequency shift is...(1. Too wide; 2. Too narrow; 3. Not linear; 4. Correct) (by Hz).

ZRJ

Will you check your...?

I will check my...

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. Under-suppressed).

ZRT

Radiate full unmodulated power for...minutes.

ZRU

Are my tone and frequencies correct?

Your tone for...(1. Marking spacing are high; 2. Marking and spacing are low; 3. Marking and spacing are correct).

ZTJ

Cease using...

ZTK

Are you (or is...) connected to...?

I am (or...is) connected to...

ZTL

Are you (or is...) about to disconnect?

I am (or...is) about to disconnect.

ZTM

I (or...) is unable to use...

ZTS

Is the line satisfactory?

The line is...(1. Satisfactory; 2. Unsatisfactory).

ZUA

Request a timing signal now (or at...).

Timing signal will be transmitted now (or at...) The numerals indicating the time will be followed by a five-second dash terminating exactly at the time indicated.

ZUB

At...

ZUC

From...to...

ZUD

Until further orders (or until...).

ZUE

Affirmative (Yes).

ZUG

Negative (No).

ZUH

Unable to comply.

ZUJ

Stand by.

ZVR

Retransmit this message (or message...) at once to all-subordinate stations.

ZWL

No forwarding action to the designation(s) immediately following is required.

ZWM

Correct answer to last question (or question...) is...(or will be found in...).

ZWN

Correct version of the part of the last message (or message...) which was sent incorrectly is...(or will be found in...).

ZXD

This message is to be delivered to the addressee(s) in tape form.

ZXO

Request you obtain retransmission of messages...from station...

ZXT

This message is not to be transmitted by radio telegraph or radiotelephone in any form over part of its route

ZXW

This message has been delivered to all action addressees whose designations follow this operating signal.

ZXX

This message has been delivered to all information addressees whose designations follow this operating signal.

ZXY

Transmit this message to the addressee(s) indicated by the numeral(s) following... All addressees are to be counted consecutively as they appear (numbers to be separated by the Separative Sign).