PHONETIC ALPHABET

Alfa through Zulu with the pronunciations that are part of the standard, and the Able Baker set the Second World War was fought with.

Why a spelling alphabet exists

Voice radio is far worse at carrying letters than it is at carrying words. B, C, D, E, G, P, T, V and Z all share the same vowel and differ only in a brief consonant at the front — exactly the part that a narrow channel, a burst of noise or a cheap microphone destroys first. M and N are barely separable at any distance. The fix is to replace each letter with a whole word, chosen so that no two words in the set can be confused even when half of each one is missing.

That is a harder design problem than it looks. The words have to be distinct from one another, pronounceable by people who share no language, resistant to being clipped at either end, and free of any meaning that could be mistaken for part of a message.

The modern alphabet

The set below is the ICAO alphabet, adopted for civil aviation and taken up by NATO, the ITU and the maritime services, which is why it answers to several names for the same twenty-six words. The pronunciation is part of the standard rather than a suggestion: the official tables print the syllables and the stress alongside each word, because a word pronounced in a national accent stops doing its job. The Morse for each letter is given beside it.

A•▬

Alfa — spoken AL FAH

B▬•••

Bravo — spoken BRAH VOH

C▬•▬•

Charlie — spoken CHAR LEE or SHAR LEE

D▬••

Delta — spoken DELL TAH

E•

Echo — spoken ECK OH

F••▬•

Foxtrot — spoken FOKS TROT

G▬▬•

Golf — spoken GOLF

H••••

Hotel — spoken HOH TELL

I••

India — spoken IN DEE AH

J•▬▬▬

Juliett — spoken JEW LEE ETT

K▬•▬

Kilo — spoken KEY LOH

L•▬••

Lima — spoken LEE MAH

M▬▬

Mike — spoken MIKE

N▬•

November — spoken NO VEM BER

O▬▬▬

Oscar — spoken OSS CAH

P•▬▬•

Papa — spoken PAH PAH

Q▬▬•▬

Quebec — spoken KEH BECK

R•▬•

Romeo — spoken ROW ME OH

S•••

Sierra — spoken SEE AIR RAH

T▬

Tango — spoken TANG GO

U••▬

Uniform — spoken YOU NEE FORM or OO NEE FORM

V•••▬

Victor — spoken VIK TAH

W•▬▬

Whiskey — spoken WISS KEY

X▬••▬

X-ray — spoken ECKS RAY

Y▬•▬▬

Yankee — spoken YANG KEY

Z▬▬••

Zulu — spoken ZOO LOO

Alfa, Juliett and the deliberate misspellings

Two of those words are spelled wrong on purpose. Alfa is not Alpha because the combination ph is not read as an f sound outside English and a handful of other languages; a French or Spanish speaker reading Alpha off a printed card may well produce something with a p in it. Juliett carries a second t because a French speaker reading Juliet would treat the final consonant as silent, and a silent letter is the one thing a spelling alphabet cannot tolerate.

The same reasoning runs through the whole list. Every word has at least two syllables except Golf and Mike, so that losing the start or the end of a transmission still leaves something identifiable. No two of them rhyme. The stress patterns differ from one to the next. Several are proper nouns recognisable across a lot of the world, which helps a listener guess at a word they only half heard.

Digits get the same treatment in the aviation version: three is spoken tree, four fower, five fife, nine niner. Nine gains a syllable partly for length and partly because the bare word is close to the German nein. The maritime service has its own number words again — nadazero, unaone, bissotwo and the rest — which are correct, official, and rarely heard outside formal traffic.

Able Baker

The alphabet of the Second World War was a different list entirely. The US joint Army and Navy alphabet, universally called Able Baker after its first two words, was adopted in 1941; British forces took it up in 1943 so that combined operations would run on one vocabulary instead of two. It is the set in the period recordings, in the wartime signals manuals, and in every war film made since. Modern equivalents are shown alongside.

A

Able — now Alfa

B

Baker — now Bravo

C

Charlie — now Charlie

D

Dog — now Delta

E

Easy — now Echo

F

Fox — now Foxtrot

G

George — now Golf

H

How — now Hotel

I

Item — now India

J

Jig — now Juliett

K

King — now Kilo

L

Love — now Lima

M

Mike — now Mike

N

Nan — now November

O

Oboe — now Oscar

P

Peter — now Papa

Q

Queen — now Quebec

R

Roger — now Romeo

S

Sugar — now Sierra

T

Tare — now Tango

U

Uncle — now Uniform

V

Victor — now Victor

W

William — now Whiskey

X

X-ray — now X-ray

Y

Yoke — now Yankee

Z

Zebra — now Zulu

Only four words came through the changeover untouched: Charlie, Mike, Victor and X-ray. Everything else was replaced.

Able Baker also left one word permanently in the language. On a circuit, R meant received — it still does in CW, as the prosigns page sets out — and because R was Roger, roger became the voice acknowledgement and stayed there long after the alphabet that produced it was retired. Wilco, short for will comply, is a separate word meaning something else entirely, which is why roger wilco is a redundancy rather than a procedure.

Before Able Baker

The British had their own sets earlier, and they are worth a look because they show how local these lists used to be. Signallers in the First World War used a spoken alphabet built around the letters that caused the most trouble on a field telephone: ack for A, beer for B, emma for M, pip for P, toc for T, esses for S, vic for V. The habit escaped the signal service entirely. Ack emma and pip emma served as morning and afternoon for a generation, and Talbot House, the soldiers' rest house behind the Ypres salient, was known as Toc H for the rest of the century.

The RAF ran a longer alphabet of its own through the interwar years and into the early part of the war, mixing plain first names and place names with those older signalese words. It worked well enough inside one service and one language, which was the limit of what anybody was asking of it, and it gave way to Able Baker in 1943.

Why one alphabet

Able Baker was excellent for English speakers and poor for everyone else. Latin American aviation used a Spanish-language alphabet instead, so an aircraft crossing between regions changed vocabulary in mid-flight — which is precisely the kind of thing that kills people in bad weather. After the war ICAO commissioned linguistic research into a single list that would survive being spoken by people whose first languages had nothing in common, and candidate words were tested with speakers of many different languages, under noise, over real circuits, listening to each other.

A first version was published in 1951 and ran into trouble almost immediately: several of its words proved fragile in practice and were replaced. The revised alphabet came into effect on 1 March 1956, NATO adopted it, the ITU followed before the decade was out and the maritime world came in behind. That is why one list now covers air traffic control, shipping, armies, emergency services and amateur radio alike, and why Alfa Bravo Charlie is understood in a tower anywhere on earth.

Phonetics on CW

You do not spell phonetically in Morse. Every letter already has its own unmistakable pattern, so sending Alfa would mean keying four characters to convey one — the opposite of the point. When a callsign or a word fails to get through, a CW operator simply repeats it, often twice and sometimes slower, or sends AGN to ask for a repeat. The nearest CW equivalent of switching to phonetics is abandoning cut numbers: contest operators shorten digits to save time, sending T for zero and N for nine, and when accuracy matters they go back to the full figures.

Phonetics belong to voice. The moment an operator moves from CW to sideband on the same band, callsigns come out as Kilo Six Zulu and the alphabet earns its keep again. For the letters themselves the chart has all of them, and the learn page covers the timing that makes them readable by ear.