Q Code

The Q-Code was first developed in 1912 as a way to facilitate communications between maritime stations of different nationalities using Morse code or CW to communicate. Use of Q-Codes also allowed some lengthy messages to be shortened. To avoid confusion callsigns never begin with Q. Q-Codes are still used in CW contacts but have also found their way into voice communication.

Most Q-Codes can be used as either a question or an answer, and therefore can have a different meaning depending on whether a question mark is used. The most common Q-Codes use on the Amateur bands are presented below:

Q-Code Question Answer/Statement
QRA What is the name of your station? The name of my station is ....
QRG Will you tell me my exact frequency? Your exact frequency is ....
QRH Does my frequency vary? Your frequency varies.
QRK What is the itelligibility of my signals? The intelligibility of your signals are (1-5)
QRM Are you troubled by interference? I am troubled by interference (1-5)
QRN Are you troubled by static? I am troubled by static (1-5)
QRO Shall I increase power? Increase power.
QRP Shall I decrease power? Decrease power / Operating at low power.
QRQ Shall I send faster? Send faster (...wpm)
QRS Shall I send more slowly? Send more slowly (...wpm)
QRT Shall I stop sending? Stop sending / Closing down.
QRV Are you ready?  
QRX When will you call me again? I will call you again at ... on ... (freq)
QRZ Who is calling me?  
QSA What is the strength of my signal? The strength of your signal is (1-5)
QSB Are my signals fading? Your signals are fading.
QSL Can you acknowledge receipt? I acknowledge receipt.
QSO   I can/am communicat/ing with ...
QSP Can you relay to ...? I will relay to ...
QSX   I am listening to ... on ... (freq)
QTH What is your location? My location is ...
QUM May I resume normal working? Normal working may be resumed.

QTHR is used to indicate the location appears in the ham callbook.