Each transmission session ends with certain codes. Over time, they become routine, but in order not to be remembered by mistakes, it is very important to use them correctly from the beginning, since there are certain nuances.
Codes transmitted at the end of a session:
| CODE | MEANING | USE |
| AR | End of broadcast. It only means “end of transmission” and nothing else. | Aired at the end of CQ and at the end of your broadcast when you call a station(1). |
| K | End of the show and I’m turning it over to you. It’s your turn! | At the end of the “over” (2) (replica) and at the end of your broadcast when you call a station. I await acceptance. |
| KN | Transfer to you only, please wait for SK (see below). | At the end of the “over” (replica). The others must wait for the current QSO to completely finish without interfering. |
| ARK | End of transmission + transfer only to you. | DO NOT use it. Bad practice. |
| ARKN | End of transmission + transfer only to you | DO NOT use it. Bad practice. |
| SK | Complete end of connection (QSO). | At the end of the QSO. Gives others freedom to call the station originally using the frequency. |
| ARSK | End of transmission + end of connection. | DO NOT use it. Bad practice. |
| SKCL | End of QSO, I am turning off the station and will not respond to other correspondents. | Used when you are terminating a job and will no longer answer to anyone. |
(1) when responding to a station that has called CQ or QRZ.
(2) transmission or over (replica) is not the same as QSO (two way radio communication). A QSO usually consists of a series of overs.
Transmitting “DIT DIT” at the end of a QSO on CW
At the end of the QSO on CW, the two partners in the connection often exchange as the last code two DITs with a slightly longer interval between them (similar to “e e”). This is not an official code, it means and sounds like the colloquial “bye-bye”.
