Potsdam Meteo :

 

a CQ test tape (rb, 1986) just in case you have no decoder at hand ;-)
Note the frequency 'UOIP' - these are the letters right below '7980' on your pc-keyboard - 'unshift-on-space' didn't work on MixW this time...

 

This nice QSL card is from 1986 (rb)

 

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Callsigns:
Y3K*

 

Frequencies Radioteletype:
1757
2014
2458
2695
3109
4045
4057
4441
7980

 

Systems used:
100 Bd
50 Bd