a recording from 1973, morse transmission
nice letter, but without any technical details (rb, 1973)
a prepared QSL from the files of Rudy van Dalen (1988)
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Callsigns:
IQH
Frequencies Voice:
1675
1785
2182
2632
2635
3735
Frequencies Morse Telegraphy:
435
500
524
6376