SECURITYSECURITY
MRA 23MRA 23-- Callsign Allocated to UKCallsign Allocated to UK
-- Associated with the RAFAssociated with the RAF
-- Indicates Geographical Indicates Geographical LocationLocation
-- Serial No Issued by HQACSerial No Issued by HQAC
MRA 23 A1 MRA 23 A1
MM
2233
AARR
Issued by Local Unit
Callsigns
Assessment Start
SECURITYSECURITY
Given using the Phonetic AlphabetGiven using the Phonetic Alphabet
Main Station CallsignMain Station Callsign
MRA 99MRA 99
Mike Romeo Alpha Nine-er Nine-Mike Romeo Alpha Nine-er Nine-erer
Main Station Callsign
Assessment
Mike Romeo Alpha Nine Nine
SECURITYSECURITY
When used away from Main StationWhen used away from Main Station Local Unit should add either:Local Unit should add either:
• One Alpha CharacterOne Alpha Character• One Alpha Character and One NumberOne Alpha Character and One Number• Two Alpha CharactersTwo Alpha Characters
AC and CC should be avoidedAC and CC should be avoided
Non Main Station Callsign
Assessment
SECURITYSECURITY
Non Base Station Callsign Examples:Non Base Station Callsign Examples:
MRA 99 AMRA 99 A MRA 99 A1MRA 99 A1 MRA 99 AAMRA 99 AA
MRA 99 BMRA 99 B MRA 99 A2MRA 99 A2 MRA 99 ABMRA 99 AB
MRA 99 GMRA 99 G MRA 99 B9MRA 99 B9 MRA 99 BGMRA 99 BG
MRA 99 XMRA 99 X MRA 99 Y1MRA 99 Y1 MRA 99 PQMRA 99 PQ
Note: The combination of AC and CC should be avoided.Note: The combination of AC and CC should be avoided.
SECURITYSECURITY
Ease of sendingEase of sending Speed up sending Speed up sending Used when instructedUsed when instructed Do not use:Do not use:
• If conditions are poorIf conditions are poor• Risk of duplicatingRisk of duplicating
Abbreviated Callsign
Assessment End
SECURITYSECURITY
The Sender.The Sender.
The Listeners.The Listeners.
The Interceptors.The Interceptors.
SECURITYSECURITY
Use unauthorised codenamesUse unauthorised codenamesUse personal names or nicknamesUse personal names or nicknamesUse slang or jargonUse slang or jargonTransmit aircraft types, roles or Transmit aircraft types, roles or
weapon loads in clear speechweapon loads in clear speechTransmit details of arms or Transmit details of arms or
ammunition, particularly their ammunition, particularly their movementmovement
Transmit unit locations in clear speechTransmit unit locations in clear speech
NeverNever
SECURITYSECURITY
Use your callsign at the start of a Use your callsign at the start of a transmissiontransmission
Use only authorised appointment titlesUse only authorised appointment titles
Ask a station to “Authenticate” if you Ask a station to “Authenticate” if you think it may not be a genuine onethink it may not be a genuine one
AlwaysAlways
SECURITYSECURITY
AUTHENTICATION:-AUTHENTICATION:-
Is a way to help protect your communications
How to do this is described later
SECURITYSECURITY
Additional Aids to SecurityAdditional Aids to Security
•CodesCodes
•Appointment TitlesAppointment Titles
•Veiled SpeechVeiled SpeechList of Appointment Titles
ACCURACYACCURACY
Before TransmittingBefore Transmitting ListenListen Know how to use microphoneKnow how to use microphone Speak clearly & distinctlySpeak clearly & distinctly Use of Press to Talk Button (PTT)Use of Press to Talk Button (PTT) Timing Timing
PROWORDSPROWORDS
THIS ISTHIS IS The callsign of the The callsign of the sender follows.sender follows.
OVEROVER This is the end of my present This is the end of my present transmission, a reply is transmission, a reply is
required.required.
OUTOUT This is the end of my This is the end of my transmission. No transmission. No
reply is reply is expected.expected.
PROWORDSPROWORDS
WAIT OUTWAIT OUT Your transmission has Your transmission has been been received, a reply received, a reply will follow will follow later..later..
WILCOWILCO Message received, understood Message received, understood and I will comply with your and I will comply with your
instructionsinstructions.. ..
ROGERROGER I have received your last I have received your last transmission transmission
satisfactorilysatisfactorily ..
PROWORDSPROWORDS
SAY AGAIN.SAY AGAIN. Request for repetition of a whole, Request for repetition of a whole, or part of a messageor part of a message
I SPELLI SPELL I shall spell the next wordI shall spell the next word
MESSAGEMESSAGE The transmission to follow will The transmission to follow will require to be written downrequire to be written down
PROWORDSPROWORDSFIGURESFIGURES Used before groups of Used before groups of
numbers sent digit numbers sent digit by digitby digit
GRIDGRID .. Used before grid Used before grid reference reference sent in clear sent in clear speech.speech.
SPEAK SLOWERSPEAK SLOWER Transmit at a slower speedTransmit at a slower speed
TIMETIME The following group is a The following group is a time time group, or a group, or a date/time groupdate/time group
PROWORDSPROWORDS
UNKNOWN STATIONUNKNOWN STATION Used when calling a Used when calling a Station Station whose whose identity is not knownidentity is not known
CORRECTCORRECT You are correct, or what You are correct, or what you have you have transmitted transmitted is correctis correct
WRONGWRONG Your last transmission was Your last transmission was incorrect. Correct incorrect. Correct
version is...version is...
PHONETICSPHONETICS
Are used:Are used: When reception is poorWhen reception is poor
• Signal is weakSignal is weak• High Background NoiseHigh Background Noise
Difficult to pronounceDifficult to pronounce Operators accentOperators accent
Assessment Start
PHONETICSPHONETICS
LetterLetter WordWordPronunciationPronunciation
AA AlphaAlpha ALAL FAH FAH
BB BravoBravo BRAHBRAH VOHVOH
CC CharlieCharlie CHARCHAR LEELEE
DD DeltaDelta DELDEL TAH TAH Assessment
PHONETICSPHONETICS
LetterLetter WordWordPronunciationPronunciation
MM MikeMikeMIKEMIKE
RR Romeo Romeo ROWROW ME OHME OH
VV VictorVictor VIKVIK TAH TAH
Some examples
For a full list see the separate Self Teach Presentation
Assessment End
MAP REFERENCESMAP REFERENCES The Proword Grid precedes a Grid RefThe Proword Grid precedes a Grid Ref
Example:Example: TQ 123 456TQ 123 456
This should be sent as follows:This should be sent as follows:GRIDGRID (short pause)(short pause)
Tango Quebec Tango Quebec (short pause)(short pause)
Wun Too Tree Wun Too Tree (short pause)(short pause)
Fower Fife Six Fower Fife Six
When sending Grid References they should be sent slower than normal
TIMETIME Given using 24-hour ClockGiven using 24-hour Clock Preceded by the Proword TimePreceded by the Proword Time
Example: 13 40 Hours sent as Example: 13 40 Hours sent as TimeTime (short pause)(short pause)
Wun TreeWun Tree (short pause)(short pause)
Fower ZeroFower Zero
DISCIPLINEDISCIPLINE
ALWAYSALWAYSUse correct voice operating procedure.Use correct voice operating procedure.Maintain a constant radio listening Maintain a constant radio listening
watch.watch.Ensure correct channel/frequency is Ensure correct channel/frequency is
selected.selected.Answer all your calls correctly.Answer all your calls correctly.Think before transmitting & make sure Think before transmitting & make sure
you know your message.you know your message.Release the PTT switch as soon as you Release the PTT switch as soon as you
have finished speaking & ensure the set have finished speaking & ensure the set returns to receive.returns to receive.
DISCIPLINEDISCIPLINE
NEVERNEVER
Compromise classified information by Compromise classified information by using plain language.using plain language.
Make unnecessary, over long or unofficial Make unnecessary, over long or unofficial transmissions.transmissions.
Identify yourself, or your unit by name.Identify yourself, or your unit by name. Swear, or lose your temper.Swear, or lose your temper.
DISCIPLINEDISCIPLINE
NEVERNEVER
Disclose Frequencies.Disclose Frequencies.
Give telephone numbers or addresses.Give telephone numbers or addresses.
Personal details about yourself or others.Personal details about yourself or others.
Group DiscussionGroup Discussion
Learning OutcomesLearning Outcomes
11 Understand what a Callsign is, Understand what a Callsign is, and how it is made up.and how it is made up.
22 Understand what the Phonetic Understand what the Phonetic Alphabet, how and when is it is used.Alphabet, how and when is it is used.