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See also Codes and Alphabets#Q-Code
QAM : Quadrature Amplitude Modulation. A method that allows simultaneous frequency and amplitude modulation of a signal.
Q Code Three letter codes used instead of sentences or phrases.
QCWA : Quarter Century Wireless Association, a radioamateur club with local chapters in which membership is offered solely to operators who were first licensed twenty-five or more years ago.
QRM : Man made noise. Can be used to indicate noise interfering with an amateur station or an amateur station interfering with other spectrum users.
QRN : Electromagnetic noise from natural sources interfering with amateur transmissions.
QRPp : Very low power operation - at or below 1 Watt.
QPSK : Quadrature Phase Shift Keying. Also known as Quadraphase Phase Shift Keying. A method of modulating a carrier in digital transmissions by changing its phase four times, with each change being represented by two binary digits.
QSB : Fading (of signals). Used in signal reports eg "your signal is experiencing rapid QSB tonight"
QRSS : Very low speed operation - typically CW below one character per minute, intended for machine-assisted reception under extreme QRP or noisy/weak signal conditions. Bandwidth used is a small fraction of 1 Hz. From QRS, a code requesting "send more slowly".
QSL : Confirmation of receipt of transmission
QTH : Home, home location, station location