Here are a few of the codes as printed in Issue 4 of 'Vector' Magazine 1998.
From the days of morse code transmissions:
QAM - What is the surface wind and speed?
QFR - Does my landing gear appear damaged?
QFG - Am I overhead?
QBF - Are you flying in cloud?
QRN - Are you troubled by static?
QTR - What is the correct time?
QRV - Are you ready?
QRM - Are you being interfered with?
Still in use today:
QDM - Mag. bearing to the station
QDR - Mag. bearing from the station
QNH - What should I set on subscale to indicate the elevation AMSL.
QFE: What should I set on subscale to indicate the elevation above ref. datum.
Hope these help a little.
A.H
Contrary to popular belief there is no correlation between the two letter after the Q and what they stood for. They are not an abbreviation, although there are some examples of it being very close to one.