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    International Q Codes  
A Q signal followed by a ? asks a question.
A Q signal without the ? answers the question affirmatively, unless otherwise indicated.
QRA What is the name of your station?    QSD Is my keying defective? 
QRG What's my exact frequency?  QSG Shall I send _____ messages at a time? 
QRH Does my frequency vary?  QSK Can you work breakin? 
QRI How is my tone? (1-3)  QSL Can you acknowledge receipt? 
QRK What is my signal intelligibility? (1-5)  QSM Shall I repeat the last message sent? 
QRL Are you busy?  QSO Can you communicate with _____ direct? 
QRM Is my transmission being interfered with?  QSP Will you relay to _____? 
QRN Are you troubled by static?  QSV Shall I send a series of V's? 
QRO Shall I increase transmitter power?  QSW Will you transmit on _____? 
QRP Shall I decrease transmitter power?  QSX Will you listen for _____ on _____? 
QRQ Shall I send faster?  QSY Shall I change frequency? 
QRS Shall I send slower?  QSZ Shall I send each word/group more than once?
(Answer, send twice or _____) 
QRT Shall I stop sending?  QTA Shall I cancel number _____? 
QRU Have you anything for me? (Answer in negative)  QTB Do you agree with my word count? (Answer negative) 
QRV Are you ready?  QTC How many messages have you to send? 
QRW Shall I tell _____ you're calling him?  QTH What is your location? 
QRX When will you call again?  QTR What is your time? 
QRZ Who is calling me?  QTV Shall I stand guard for you _____? 
QSA What is my signal strength? (1-5)  QTX Will you keep your station open for further communication with me? 
QSB Are my signals fading?  QUA Have you news of _____? 
Source: ARRL website
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