Phonetic alphabet for amateur radio

Use the standard words. Improvised phonetics work in clear conditions and fail exactly when you need them.

The short answer

The standard phonetic alphabet is Alpha, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu. It was designed so that no two words sound alike under noise, which is exactly why improvised substitutes fail.

Standard: ITU and NATO
Letters: 26
Designed for: Intelligibility under noise
Juliett spelling: Two Ts
Alfa spelling: One F in ITU
When to use: Every callsign, always

On a noisy HF band, individual letters vanish. B, C, D, E, G, P, T and V all sound identical through a marginal signal, and so do M and N, and F and S. The standard phonetic alphabet exists because those collisions were measured and the words were chosen to eliminate them.

That is worth knowing because it explains why improvised phonetics are a bad idea. Substituting a place name for the standard word usually works when you can already be heard, and fails precisely when the alphabet was needed.

The standard alphabet

Letters

ITU and NATO phonetic alphabet

Letter	Word	Pronunciation	Common wrong substitute
A	Alfa	AL fah	America, Amsterdam
B	Bravo	BRAH voh	Boston, Baltimore
C	Charlie	CHAR lee	Canada, Chicago
D	Delta	DELL tah	Denmark, Dakota
E	Echo	ECK oh	England, Easy
F	Foxtrot	FOKS trot	Florida, France
G	Golf	GOLF	Germany, Guatemala
H	Hotel	hoh TELL	Honolulu, Havana
I	India	IN dee ah	Italy, Item
J	Juliett	JEW lee ETT	Japan, Jupiter
K	Kilo	KEY loh	Kilowatt, Kentucky
L	Lima	LEE mah	London, Lincoln
M	Mike	MIKE	Mexico, Mary
N	November	no VEM ber	Norway, Nancy
O	Oscar	OSS cah	Ontario, Ocean
P	Papa	pah PAH	Portugal, Peter
Q	Quebec	keh BECK	Queen
R	Romeo	ROW me oh	Radio, Robert
S	Sierra	see AIR rah	Santiago, Sugar
T	Tango	TANG go	Tokyo, Texas
U	Uniform	YOU nee form	United, Uncle
V	Victor	VIK tah	Victoria
W	Whiskey	WISS key	Washington, William
X	X-ray	ECKS ray	Xylophone
Y	Yankee	YANG key	Yokohama, Young
Z	Zulu	ZOO loo	Zanzibar, Zebra

Alfa and Juliett are spelled that way deliberately in the ITU standard so that speakers of languages without the ph and final t conventions pronounce them correctly. Amateurs generally write Alpha, and nobody minds.

Numbers

Digits

Standard number pronunciation

Digit	Spoken as	Note
0	ZERO	Never oh, which is confused with the letter O
1	WUN
2	TOO
3	TREE	The final consonant is dropped in the standard
4	FOWER	Two syllables
5	FIFE	The final consonant differs from nine
6	SIX
7	SEVEN
8	AIT
9	NINER	Two syllables, to separate it from five

The number modifications exist for the same reason as the letters. Niner and fife are distinguishable under noise where nine and five are not, and zero is never spoken as oh because O is a letter in every callsign format.

When to use it

Every time you give your callsign to a station that has not already copied it. Once they have it, plain letters are fine.
Always on a first call, always when answering a CQ, and always when there is any noise at all.
When somebody asks for a repeat, use the phonetics rather than saying the same letters louder.
On repeaters and local FM, phonetics are usually unnecessary because the signal is either full quieting or absent.
On a DX contact where English is not the other operator first language, the standard alphabet is far more likely to be understood than any place name.
When passing any information that must be exact: a name, a location, an email address, a serial number.

Making yourself understood on a weak signal

Slow down. Speaking at half your normal rate costs seconds and gains a great deal of intelligibility.
Speak across the microphone rather than into it, at a consistent distance. A Heil Pro 7 headset microphone headset fixes distance and angle permanently.
Do not shout. Overdriving the microphone produces distortion that costs readability, which is the opposite of what you want.
Use a small amount of speech processing on a weak path and none on a strong one. Heavy processing raises average power and degrades audio quality.
Pause between phonetic words rather than running them together.
A AIRITON external communications speaker at your end improves what you hear, which matters as much as what you send.

Audio gear that raises readability

What actually improves copy

Readability is the first digit of the report, and it responds to audio quality rather than power.

Heil Sound

Heil Pro 7 headset microphone

A communications headset with a microphone element voiced for intelligibility rather than fidelity, and a fixed distance from your mouth.

Check price$457.75

Baofeng

Baofeng BF-850 speaker mic

A speaker microphone for handheld use, which improves both audio and your RF exposure situation.

Check price$12.99

Heletul

Heletul over-ear boom headset

A boom headset for hands-free operation at events and in noisy environments.

Check price$23.32

AIRITON

AIRITON external communications speaker

An external speaker aimed at your ear rather than at the desk. Improves what you copy, which is half of every contact.

Check price$12.99

Icom

Icom IC-7300

Transmit audio shaping and a scope, which together let you see and hear what you are actually sending.

Check price$1,255.74

Common questions

Questions people ask about this

Do I have to use the standard phonetic alphabet?

There is no rule requiring it, and there is a strong practical reason to. The standard words were selected because they stay distinguishable when a signal is weak and noisy, which is exactly when you need them. Improvised substitutes usually work when you could already be heard and fail when the alphabet was doing real work.

Why is zero spoken as zero rather than oh?

Because O is a letter that appears in callsigns, and confusing the letter O with the digit 0 produces a wrong callsign that is then logged wrongly by both stations. The number conventions in the standard exist for the same reason as the letters: niner and fife stay distinguishable under noise where nine and five collide.

Is it Alpha or Alfa?

The ITU standard spells it Alfa and Juliett with two Ts, so that speakers of languages that do not use the ph digraph or a final t pronounce them correctly. In amateur use both spellings appear constantly and nobody objects. Pronunciation is what matters and it is identical either way.

Should I use phonetics on a repeater?

Usually not, because FM either delivers a full quieting signal or nothing, so plain letters are copied perfectly. Use them on a first contact with somebody who does not know you, when a station is at the edge of coverage, or any time somebody asks for a repeat. On HF, use them essentially always.

How do I make my signal easier to copy?

Slow down, speak across the microphone at a consistent distance, and do not shout, since overdriving produces distortion that lowers readability. A communications headset fixes microphone position permanently. Light speech processing helps on a weak path and heavy processing degrades audio quality on any path.

Keep going

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