APS Alger :
listen to the RTTY test slip, recorded in 1992 (rb)
just in case you have no decoder at hand ;-)
a friendly verification letter from the collection of Andreas Ibold (1986)
this letter from 1990 gives you the complete transmission schedule (Ary Boender)
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Frequencies Radioteletype:
4380
9380
10340
14932
15480
Systems used:
50 Bd