Unid 100Bd PSK2 signal recorded on 4844.0 KHz and 6819.5 KHz USB (Figure 1)
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| Fig. 1 |
The demodulated bistreams, after differential decoding, show two different 133-bit length periods: supposedly, the first one (4844.0 KHz, Figure 2) is a combination of the source and destination address while the second one (6819.5 KHz, Figure 3) seems to refer to sending a message - several times repeated - to the correspondent. It's worth noting in the demodulated bitstream of Figure 2 what seem to be five "sections" following the header (that's the same in the two bitstreams).
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| Fig. 1 |
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| Fig. 2 |
More material is needed to fully understand the nature of such communications, comments are welcome.
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