LORAN Jan Mayen (JXP):

 

in this clip you will hear the net control stations, NMS Shetland Islands, working with JXP Jan Mayen in minute 1'20 (rb, 1974)
listen to this soundclip from 1985, JXP Jan Mayen and TFR2 Keflavik working (rb)

Maarten van Delft received this fine postcard in 1971 - you can see JXP's antennas on it
here is a card from the files of Lars Lundström (1972)
this PPC from the cold north came in 1986 (rb)
Rudy van Dalen received this card with the foto in 1986
google's 'Panoramio' picture service was unfortunately discontinued - there I found this picture in 2007 without noticing who did it

 

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Callsigns:
JXP
RYFXS

 

Frequencies Voice:
3607
4857.5
6779
7512.5
7715
10337.5
13423

 

Frequencies Radioteletype:
100
7514
7717.5

 

Systems used:
50 Bd
Data