the channel marker for radioteletype, GNK1 (rb, 1986)
this card came in 1986 (rb)
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Callsigns:
GNK*
Frequencies Voice:
1659
1770
2182
2604
2751
3528
Frequencies Radioteletype:
2832.7
3299
3542.7
Systems used:
AUTOSPEC-68
SITOR