USNy Londonderry :

 

listen to their ECMP morse code marker, as transmitted simultaneously by many stations (rb, 1974)


a nice QSL-card with a very detailed letter (Martin Foltz, 1975)

 

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Callsigns:
NST

 

Frequencies Morse Telegraphy:
2590
3770
4584
5052
5940
7504.5
7795
9318
9821
12691
15942
19761
19782