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Amateur Radio |
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| Voice | Code | Situation |
| Go ahead | K | Used after calling CQ, or at the end of a transmission, to indicate any station is invited to transmit |
| Over | AR | Used after a call to a specific station, before the contact has been established |
| KN | Used at the end of any transmission when only the specific station contacted is invited to answer |
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| Stand-By or Wait | AS | A temporary interruption of the contact |
| Roger | R | Indicates a transmission has been received correctly and in full |
| Clear | SK | End of contact. SK is sent before the final identification |
| Leaving-The-Air or Closing-The-Station |
CL | Indicates that a station is going off the air, and will not listen or answer any further calls. CL is sent after the final identification |
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Some Materials are Patent Pending |
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