FDM like beacons

on 16 , 15 and 17 mHz in sequence , first in AM mode , and after 10-15 secs in SSB mode .
The DTMF tones are separators of the 3 different recordings , deliberately added!

Received with magnetic loop , De1103 and Creative Zen as recorder

If anyone knows something more please advise me!!

Update : a more check on the spectrum revealed signals with steps of 200 kHz starting from ca 3 mHz up to at least 35 mHz