Ham Radio Q Codes

Quick definitions for widely used Q signals heard on voice and CW.

Common Q Codes

CodeMeaning
QRMInterference from other stations
QRNNatural/static noise
QRPLow-power operation
QROIncrease transmitter power
QRTStop transmitting / shut down station
QRZ?Who is calling me?
QSBSignal fading
QSLI acknowledge receipt
QSYChange frequency
QTHStation location