INTERPOL / Kantonspolizei / MoI Zürich (HEP) :

The station HEP was used as Swiss INTERPOL connection until about the mid-1980's, but suddenly it was used again; possibly for internal circuits, as the telegraph marker HEP appeared in 1994 on rather low frequencies.

 

a recording of the morse signal - purpose widely unknown (rb, 1994)

 

Rudy van Dalen received this verification letter for INTERPOL service in 1984
in 1994, Dieter Pohlmann received this QSL-letter, declaring transmissions as tests

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Callsigns:
HEP

 

Frequencies Morse Telegraphy:
3309
3314
3331
5263
5268
5271
5622.5
6792
6804
6871
6884
6905
9186
9194
10390
14817.5

 

Frequencies Radioteletype:
2840
3717
3735
4632
4837.5
5208
5305.5
6905
7401
7532
8038

 

Systems used:
SITOR