International Q Code is an abbreviated way to exchange a great deal of information with a simple code. The Q Code consists of three-letter groups with each group having a specific meaning. Each group begins with the letter Q. Auxiliary letter groups or numbers are also used to help define the information that is need or passed with certain Q Code three-letter groups.
The International Q Code can be arranged in three types of code groups according to the second letter in the three-letter Q Code.
The Q Code comprises :
A. General Codes, second letter of which is R, S, T or U. (Some used by Hams).
B. Maritime Service Codes, second letter of which is O, P or Q.
C. Aeronautical Codes, second letter of which is A, B, C, D, E, F, G, H, I, J, K, L, M or N.
Some common Q-Codes used by Amateur Radio Operators are:
Signal --- Question
QRG : Will you indicate my exact frequency in kilocycles?
QRH : Does my frequency vary?
QRI : How is the tone of my transmission?
QRJ : Are you receiving me badly? Are my signals weak?
QRK : What is the legibility of my signals (1 to 5)?
QRL : Are you busy?
QRM : Are you being interfered with?
QRN : Are you troubled by static?
QRO : Must I increase power?
QRP : Must I decrease power?
QRQ : Must I send faster?
QRS : Must I send more slowly?
QRT : Must I stop transmission?
QRU : Have you anything for me?
QRV : Are you ready?
QRW : Must I advise ... that you are calling him on ... kc?
QRX : When will you call again?
QRZ : By whom am I being called?
QSA : What is the strength of my signals (1 to 5)?
QSB : Does the strength of my signals vary?
QSD : Is my keying correct? Are my signals distinct?
QSG : Must I transmit ... telegrams (or one telegram) at a time?
QSK : Shall I continue the transmission of all my traffic?
QSL : Can you acknowledge receipt?
QSM : Shall I repeat the last telegram I sent you?
QSO : Can you communicate with ... directly (or through...)?
QSP : Will you relay to ...?
QSV : Shall I send a series of VVV....?
QSX : Will you listen for ... (call sign) on ... kcs?
QSY : Shall I change to ... kilocycles without changing the type of wave?
QSZ : Shall I send each word or group twice?
QTA : Shall I cancel nr ... as if it had not been sent?
QTB : Do you agree with my word count?
QTC : How many telegrams have you to send?
QTH : What is your position (location)?
QTR : What is the exact time?