The traffic in the direction of ship-to-shore takes place in several steps:
- Call the coast station on the emergency and calling frequency of 500 kHz
- Change to the working frequency and wait until the coast station requests transmission
- Transmit the telegram
- Acknowledgment of receipt (receipt). Without confirmation of receipt, the telegram is considered not to have been transmitted
- End radio communication.
Here the ship calls DGAI Norddeich Radio and informs through the Q group QTC that it has a telegram to transmit. With “up 425” the desired working frequency (your own transmission frequency) is communicated to the coast radio station.
Norddeich Radio confirms the frequency with “up 425/444” and at the same time communicates its own transmission frequency. The abbreviation “AS (.-…)” means “please wait”. Sometimes it is also given with a time in minutes, e.g. “AS 10” = wait approx. 10 minutes.
The radio operator on DGAI sets his transmitter to 425 kHz and his receiver to 444 kHz, with Norddeich Radio accordingly to 444 kHz on the transmitter and 425 kHz on the receiver.
After the frequency change, the radio operator of the maritime radio station waits until he is asked to transmit by Norddeich Radio. Before the transmission, both stations may ask for some vvv symbols to be sent, e.g. as follows:
The vvv characters are given until the remote station answers and requests the transmission of the telegram. Only then is the telegram transmitted to the coast radio station.
At the beginning of the telegram or any other document such as a TR or an OBS, the group KA is always given and coherently as if it were a character, i.e. _._._.
The telegram is then completely transmitted. In doing so, attention must be paid to interruptions and queries from the other station, which may request repetition of individual characters or words.
When the telegram has been completely transmitted, the confirmation of receipt is waited for. If the coast station agrees with the word count, it only sends the acknowledgment (QSL) with the transmitted telegram number, otherwise it will give the correct word count. The following applies: The coast radio station is always right!
After the receipt, Norddeich Radio informs the remote station that there are no further telegrams and says goodbye with “TUSU” ie “thank you see you” and at the very end, SK. The marine radio station also does this and ends the transmission with SK.