Tokyo Coast Guard :

 

this recording from Andy Stumpf lets you listen again to the telegraph signal of JNA (1987)

 

in 1986, they verified with a nice letter (rb)
from 1989 dates this very nice QSL-card with letter (Frank Schüttig)

 

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Callsigns:
JNA

 

Frequencies Voice:
2182
2394.5
4125
4354
6215
6519
8291
8707
8710
12290
13173
13179
16420
17395
17401
19764
19767
22822
22825

 

Frequencies Morse Telegraphy:
2576.5
4276
4305
4305.5
8492
8571
12658
12788
12942
13076.5
16911.2
17052.5
22576.5
22648.5

 

Frequencies Radioteletype:
4216.5
4219.5
6320.5
6331
8419.5
8436.5
12590
12657
16812
16903
19684.5
19703.5
22412
22444

 

Systems used:
DSC
SITOR
SSFC