Presented in the table below are some common Q-Codes used by radio amateurs. 

These codes were found on the inside cover of a 1965 ARRL Amateur Radio Station Log Book. 
reprint from w5www web

Q Codes marked with an " * " are the most commonly used today. A question is indicated by the use of the interrogation sign, " ? ", after the Q signal. 

The Amateur Radio Q-Code Signal Question Answer, Advice or Order 
QRG Will you indicate my exact frequency in kilocycles? Your frequency is ... kc. 
QRH Does my frequency vary? Your frequency varies. 
QRI How is the tone of my transmission? The tone of your transmission is ...
1. Good.
2. Variable.
3. Bad. 
QRJ Are you receiving me badly? Are my signals weak?               I cannot receive you. Your signals are too weak. 
QRK What is the legibility of my signals (1 to 5)?                         The legibility of your signals is ... (1 to 5). 
QRL * Are you busy? I am busy (or busy with....).                        Please do not interfere. 
QRM * Are you being interfered with?                                          I am being interfered with. 
QRN * Are you troubled by static?                                                I am troubled by static. 
QRO * Must I increase power?                                                      Increase power. 
QRP * Must I decrease power?                                                      Decrease power. 
QRQ * Must I send faster?                                                            Send faster ... (words per min.). 
QRS * Must I send more slowly?                                                   Transmit more slowly ... (w.p.m.). 
QRT * Must I stop transmission?                                                  Stop transmission. 
QRU * Have you anything for me?                                                I have nothing for you. 
QRV * Are you ready?                                                                   I am ready. 
QRW Must I advise ... that you are calling him on ... kc?              Please advise ... that I am calling him on ... kc. 
QRX * When will you call again?                                                   I will call you again at ... hours (on ... kc.). 
QRZ * By whom am I being called?                                               You are being called by ... 
QSA What is the strength of my signals (1 to 5)?                           The strength of your signals is ... (1 to 5). 
QSB * Does the strength of my signals vary?                                 The strength of your signals varies. 
QSD Is my keying correct? Are my signals distinct?                      Your keying is incorrect; your signals are bad. 
QSG Must I transmit ... telegrams (or one telegram) at a time?     Transmit ... telegrams (or one telegram) at a time. 
QSK * Shall I continue the transmission of all my traffic?             I can hear you between my signals. Continue: I shall interrupt you if necessary. 
QSL * Can you acknowledge receipt?                                            I am acknowledging receipt. 
QSM Shall I repeat the last telegram I sent you?                           Repeat the last telegram you sent me. 
QSO * Can you communicate with ... directly (or through...)?      I can communicate with ... direct (or through...). 
QSP Will you relay to ...?                                                              I will relay to ... free of charge. 
QSV Shall I send a series of VVV....?                                            Send a series of VVV. 
QSX Will you listen for ... (call sign) on ... kcs?                             I am listening for ... on ... kcs. 
QSY * Shall I change to  kcs without changing the type of wave?  Change to ... kc. without changing type of wave. 
QSZ Shall I send each word or group twice?                                  Send each word or group twice. 
QTA Shall I cancel nr ... as if it had not been sent?                       Cancel nr ... as if it had not been sent. 
QTB Do you agree with my word count?                                       I do not agree with your word count; I shall repeat the first letter of each word and the first figure of each number. 
QTC How many telegrams have you to send?                                I have ... telegrams for you or for .... 
QTH * What is your position (location)?                                       My position (location) is .... 
QTR What is the exact time? The exact time is .... 
QST *  General call preceeding a message address to all amateurs and A.R.R.L. Members. This is in effect "CQ ARRL". 
QRRR  Official A.R.R.L. "land SOS." A distress call for emergency use only. 


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