Anyone know what all the low freq multitone signals are and how to decode them? I suspect they are commercial and have proprietary encoding. I have one up on the screen now on 289.1 kHz - very strong with perhaps 32 different tones in a 120Hz spectrum. The 100kHz to 500kHz band is loaded with them inbetween all the airport beacons. At the least it might make for a neat new mode for Patrick to include in MultiPSK.
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