Sunday, 16 September 2012

UNID 12371 USB signal: Mystery solved.

The peculiar signal seems to be the result of audio feedback:

The above article resolves most of the similar "mystery" signals like "the whales". However, I can't forget that...
Any sufficiently advanced technology is indistinguishable from noise.


Anonymous said...

I am delighted that you've been able to solve the mystery.
I have an unknown signal and I need someone to give me some clue.
It is a signal over-regulated, with a shift from 200 Hz to 300 Bd of speed.
The signal starts with three tones not modulated, a header's data, three not modulated tones and ends with a burst of data and weft end.
I have long been studying this signal and I have tried with different analyzers. I hope that someone can help me. Thank you.

Manolis said...


Can you be more specific? Like including the time and frequency of the transmission?

Maybe your signal is SK01, the digital sister of V02a. They use a mode called RDFT which can be decoded with ham radio software.