I have this audio file (WAV) that I'm trying to decode using multimon-ng (also tried Qtmm AFSK1200 Decocoder). It should be using AFKS1200 but multimon-ng can't demodulate it and by the looks from the frequency analysis it doesn't quite match other images I found. Some EIA, EEA and CCIR messages can be seen but nothing else, except for the whole CSVDUMP.
The screenshot above shows peaks at ~1900 Hz (and at ~2222, 1200, 1570). I think it looks quite like AFSK1200 transmission.
WAV-file can be downloaded here (mono 44k1, PCM, 16-bit)
How would I go about to analyze what type is actually used on this?
I searched for images and audio. Listened and looked at examples of different mod-types, but I found nothing that really sounds or looks like the spectrum of this audio.
Would be grateful for any input on this.