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- Wikipedia: Q Code
Encyclopedia article about Q code, the codes used by ham and amateur radio operators. Q codes are three letter sequences, all starting with Q.
- List of Q-codes
Glossary of Q-codes used by amateur radio operators and aeronautical or maritime agencies. Sorted alphabetically.
- Amateur Radio Q-Signals
Quick reference to Q-codes or Q-signals, three letter codes used by ham and amateur radio operators.
- Q-Signals 1909
1909 handbook for telegraph and radio operators, describing the original Q-codes.