Interesting and unid transmissions consisting of 50Bd/612(600?) FSK bursts heard by me and my friend cryptomaster a fewer days ago, respectively on 6969.10 KHz and 14353.73 KHz (both CF). The bursts have a duration of 3600 ms and are transmitted with an interval of 1340 ms (Figure 1).
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| Fig. 1 - FSK bursts transmission |
The bitmap shows an asynchronous 8N1 frame where curiously the start/stop bits appear to be transmitted with reverse polarity than usually utilized (Figure 2).
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| Fig. 2 - 8N1 frame |
As shown in Figures 3,4 the bursts have the same content, most likely any kind of ASCII command. DF's attempts have not produced consistent results, possibly due to the nature of the transmissions (not continuous).
Fig. 3 
Fig. 4
