I finally recorded a narrow band of signals I've been hearing for the last few years and wondered if the collective could shed any light on their origin. When propagation is towards Italy and Spain multiple RTTY beacons appear on 27.551 (USB). I've heard them on some of the European SDRs so appear to be authentic and distant but so far I have been unable to decode anything from them.
I'm aware of the continous FSK wave bouy signals above 10M but these remain a mystery so any clues as to their origin or function would be very much appreciated.
Here's the video of this morning's reception.
https://vimeo.com/347029020
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Mystery RTTY signals
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