As a follow on from my previous video introducing the SDR, here is a collection of various digital modes used by utilities, mariners and amateur radio users. There are various modes such as XSL, TADIL, HFDL, Pactor, CW, HF Fax, Packet, JT, ALE, DRM, RTTY and various OFDM schemes.
Video Rating: 4 / 5

10 replies
  1. SWL1409
    SWL1409 says:

    Very good and interesting video.
    What software do you use to decode HF ACARS?
    The digital mode at 05:19 is called “STANAG 4285”.

    Reply
  2. lameandstupid
    lameandstupid says:

    Thanks for the comment and thanks for the info, I’ll give 4285 a go with Skysweeper and see if it turns anything up.

    I’m using one called PC-HFDL from a while back. Seems to do the job just fine for me, I’ve had no trouble decoding 300bps – 1200bps long-slot (4.2sec) even with the Icom IC-R75 piped through a sound card, or the SDR. We don’t get many 1800bps transmissions down here.

    Reply
  3. TheBroadcastEngineer
    TheBroadcastEngineer says:

    AT&T in the 60’s and 70’s used some strange signaling to conduct circuit tests. It’s funny, the frequency identified as such never modulated anything but a station ID in English. One station easily heard in the Central US was located near NY City as per it’s ID .

    Reply
  4. SWLDXBulgaria
    SWLDXBulgaria says:

    @Antonio30ir103 I can hear this on multiple frequencies all over the shortwave bands with very, very clear and strong signal, is this really the NATO stanag military communications or just local QRM?

    Reply

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