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Video Rating: 5 / 5

No idea what this is but I had to record it once I heard it.
Video Rating: 0 / 5

2 replies
  1. snarfusmaximus
    snarfusmaximus says:

    Thanks heaps for that information. One thing I love about shortwave is some
    of the weird stuff stuff you can hear. What I love about the internet is
    finding answers to such mysteries. I’ve just learned something new as a
    result. Cheers!

    Reply
  2. cnick6
    cnick6 says:

    This is a HF digital mode called JSM (Japanese Slot Machine) — you can
    probably guess why — but it is used by the Japanese Navy for secure data
    communication.

    Reply

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