North Foreland Radio :

 

this is the radioteletype marker, with morse code ID, as recorded in 1986 (rb)
listen to their call from 2182 kHz, recorded in 1988 by Rudy van Dalen

 

see here a detailed letter (Rudy van Dalen, 1982)

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Callsigns:
GNF

 

Frequencies Voice:
1707
1848
2182

 

Frequencies Morse Telegraphy:
417
418
500
512

 

Frequencies Radioteletype:
3607.3

 

Systems used:
SITOR