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| Alphabetical | By Popularity (What's This?) | | - Amateur Radio Q-Signals
 - Quick reference to Q-codes or Q-signals, three letter codes used by ham and amateur radio operators. - List of Q-codes
- Glossary of Q-codes used by amateur radio operators and aeronautical or maritime agencies. Sorted alphabetically.
- Q-Signals 1909
- 1909 handbook for telegraph and radio operators, describing the original Q-codes.
- 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.
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