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DDK9: DWD weather RTTY on 10100.8 kHz shortwave
The shortwave outlet of the German weather service's marine teletype: the same North Sea and Baltic bulletins as on long wave, 50 baud, 450 Hz shift, around the clock, at the bottom edge of the 30 metre band.
What you hear
The same 50 baud teletype as on 147.3 kHz: station reports, forecasts and gale warnings for the North Sea and the Baltic, with pauses on a single tone between bulletins. Here the two tones are 450 Hz apart, wider than the amateur standard, two well-separated lines on the waterfall. The service and who runs it: the main article.
Who transmits and why
The Deutscher Wetterdienst sends the bulletins from Pinneberg on several bands at once; DDK9 on 10100.8 kHz runs around the clock and reaches furthest in daylight. Radio amateurs know it: it sits just above the lower edge of the 30 metre band, often the first signal met there.
When and where to listen
10 MHz works by day and by night: from mid-morning to evening the signal is heard across Europe, and after dark it still carries a thousand kilometres or more, making it the most reliable DWD outlet at any hour. Germany and its neighbours get it loud; Britain, Scandinavia, Spain or Italy weaker but steady.
In ShackDeck
Station catalogue → Aviation → DDK9 Hamburg RTTY (10100.8 kHz). The program picks a public receiver with 10100.8 kHz, tunes it and sets USB: you hear the teletype and see it on the waterfall, with nothing of your own. To read it, open the Decoders entry RTTY DWD 10100.8 kHz, where the program sets RTTY at 50 baud and 450 Hz shift and the decoded weather scrolls in the text panel.