Q
Communication Aids
Q-Code Lookup
Look up the meaning of Q-codes and see how they are used as both statements and questions.
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Tool
QRA
Name of my station
QRG
Your exact frequency is …
QRL
I am busy / this frequency is in use
QRM
Man-made interference
QRN
Natural (static) interference
QRO
Increase power
QRP
Decrease power / low-power operation
QRQ
Send faster
QRS
Send more slowly
QRT
Stop sending / close down
QRU
I have nothing for you
QRV
I am ready
QRX
Please stand by
QRZ
Who is calling me?
QSB
Your signal is fading
QSL
I confirm receipt
QSO
A radio contact / conversation
QSY
Change frequency
QTH
My location is …
QTR
Correct time is …
02
How it works
Q-codes are three-letter abbreviations originally established for maritime radio in 1909 and adopted by ITU. In the amateur (QRA–QUZ) range, each code can be a question (add '?') or a statement. Example: 'QTH?' = 'What is your location?'; 'QTH London' = 'My location is London.'
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How to use
- Type any letters or words to filter the table.
- Each entry shows the code, its meaning as a statement, and typical usage.
04
Frequently asked questions
Are Q-codes still used on voice?
Yes — QTH, QRZ, QSY, QSL, QRM, and QSB are all common on phone as short jargon.
Where do I find the full list?
ITU-R M.1172 defines the complete Q-code series.