On Air Information

Standard ITU Phonetics 

The International Telecommunication Union (ITU) phonetic alphabet is
generally understood by hams in all countries.
It is used when signing your call or passing information that must be spelled out. 
For example, VK4YAR should sign Victor Kilo Four Yankee Alfa Romeo.

A - Alfa
B - Bravo
C - Charlie
D - Delta
E - Echo
F - Foxtrot
G - Golf
H - Hotel
I - India
J - Juliett
K - Kilo
L - Lima
M - Mike
N - November
O - Oscar
P - Papa
Q - Quebec
R - Romeo
S - Sierra
T - Tango
U - Uniform
V - Victor
W - Whiskey
X - X-Ray
Y - Yankee
Z - Zulu

Q Signals

Q-signals are short, three letter codes used in CW (morse code) communication to speed up the contacts.
Do not use these codes for voice communication, say what you mean instead. 

QRG   Will you tell me my exact frequency? Your exact frequency is... 
QRL   Are you busy? I am busy. Please do not interfere. 
QRM   Is my transmission being interfered with? Your transmission is being interfered. 
QRN   Are you troubled by static? I am troubled by static. 
QRO   Shall I increase power? Increase power. 
QRP   Shall I decrease power? Decrease power. 
QRQ   Shall I send faster? Send faster. 
QRS   Shall I send more slowly? Send more slowly. 
QRT   Shall I stop sending? Stop sending. 
QRU   Have you anything for me? I have nothing for you. 
QRV   Are you ready? I am ready. 
QRX   When will you call me again? I will call you again at... (hours). 
QRZ   Who is calling me? You are being called by... 
QSB   Are my signals fading? Your signals are fading. 
QSK   Can you hear me between your signals and if so can I break in on your transmission?
           I can hear you between signals; break in on my transmission. 
QSL   Can you acknowledge receipt (of message or transmission)? I am acknowledging receipt. 
QSN   Did you hear me on (frequency)? I did hear you on (frequency). 
QSO   Can you communicate with (call sign) direct or by relay?
           I can communicate with (call sign) direct or relay through (call sign). 
QSP   Will you relay to (call sign)? I will relay to (call sign). 
QST   General call preceding a message addressed to all amateurs and ARRL members. This is in effect "CQ ARRL". 
QSX   Will you listen to (call sign) on (frequency)? I am listening to (call sign) on (frequency). 
QSY   Shall I change to transmission on another frequency? Change to transmission on another frequency. 
QTB   Do you agree with my counting of words? I do not agree with your counting of words. 
           I will repeat the first letter or digit of each word or group. 
QTC   How many messages have you to send? I have # messages for you. 
QTH   What is your location? My location is ... 
QTR   What is the correct time? The time is ...