Code
Explain off the code's

QRA
What is the name of your station?
QRG
Will you tell me my exact frequency?
QRH
Does my frequency vary?
QRI
How is the tone of my transmission?
QRJ
Are you receiving me badly?
QRK
What is the intelligibility of my signals?
QRL
Are you busy?
QRM
Is my transmission being interfered ?
QRN
Are you troubled by static?
QRO
Shall I increase power?
QRP
Shall I decrease power?
QRQ
Shall I send faster?
QRS
Shall I send more slowly?
QRT
Shall I stop sending?
QRU
Have you anything for me?
QRV
Are you ready?
QRW
Shall I inform the other station that you are calling?
QRX
When will you call me again?
QRZ
Who is calling me?
QSA
What is the strength of my signals?
QSB
Are my signals fading?
QSD
Is my keying defective?
QSG
Shall I send more messages at a time?
QSK
Can you hear me between you signals ?
QSL
Please confirm you rx my message ?
QSM
Shall I repeat the last message which I sent you?
QSN
Did you hear me on ........  kHz?
QSO
Can you communicate with ..... direct or by relay?
QSP
Will you relay to ..... ?
QSR
Do you want me to repeat my call?
QSS
What working frequency will you use?
QSU
Shall I send or reply on this frequency?
QSW
Will you send on this frequency?
QSX
Will you listen to ... (call sign(s) on ...  ... kHz (or MHz))?
QSY
Shall I change to another frequency?
QSZ
Shall I send each word or group more than once?
QTA
Shall I cancel message number ___?
QTC
How many messages have you to send?
QTH
What is your location?
QTR
What is the correct time?