It means to communicate, or can [you] communicate. Commonly used to describe a conversation over the radio. So whenever we talk to someone on the airways it is called a QSO. You can Google "Q Codes" and see most of the common one that are used. Anther common one is QTH and it means location. QRM is interference and
QRN is static. Q codes were used as short cuts to improve capacity of code operators in the old days. They are still used by CW (that stands for continuous wave which means morse code) but it has carried over into SSB (which stands for single sideband) communications. That means voice communications.
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