Loggings => Utility => Topic started by: ~SIGINT~ on August 10, 2021, 0033 UTC
Title: Israeli Navy 6931 kHz USB 0016 UTC 10 AUG 2021
Post by: ~SIGINT~ on August 10, 2021, 0033 UTC
UNID 6931.0 kHz USB 00:16 10 AUGUST 2021
00:16 UTC - UNID with digital data transmission (unknown format); 00:31 UTC - UNID with digital data transmission (unknown format); 00:34 UTC - UNID with digital data transmission (unknown format); 01:00 UTC - UNID with digital data transmission (unknown format); 01:46 UTC - UNID data transmissions continue; 02:00 UTC - UNID with digital data transmission (unknown format); 02:30 UTC - UNID with digital data transmission (unknown format); 03:00 UTC - UNID with digital data transmission (unknown format); 03:30 UTC - UNID with digital data transmission (unknown format); 04:00 UTC - UNID with digital data transmission (unknown format); 04:08 UTC - Number of messages being transmitted have decreased.
Notes: a. The message is composed of a 2 second long, 4 tone preamble followed by the stream of data; b. The data segment following the preamble is +/- 15 seconds in duration; c. Transmissions appear to follow a consistent start at the top of the hour (00) and bottom of the hour (30) with additional messages interspersed throughout; and d. The signal is potentially European in origin. Signal strength was observed to be very high and loud and clear from the University of Twente Wide-band WebSDR. Also heard on UK and Barcelona Spain KiwiSDRs.
Title: Re: UNID 6931 kHz USB 0016 10 AUG 2021
Post by: tiNG on August 10, 2021, 0952 UTC
Hi.
I have Israeli Navy listed on the frequency with a modifies MIL-STD 188-110 modem.
Hope this helps.
Title: Re: UNID 6931 kHz USB 0016 10 AUG 2021
Post by: ~SIGINT~ on August 10, 2021, 2045 UTC
Thank you Thomas, that certainly fits the profile and was confirmed by a user on the UDXF group as:
Israeli Navy Hybrid Modem 188-110 MOD https://www.sigidwiki.com/wiki/Israeli_Navy_Hybrid_Modem_(188-110_MOD) (https://www.sigidwiki.com/wiki/Israeli_Navy_Hybrid_Modem_(188-110_MOD))
It will definitely be worth some additional monitoring and further research on the modem. I have kept an mp3 and I/Q recording for further analysis.
Title: Re: Israeli Navy 6931 kHz USB 0016 UTC 10 AUG 2021
Post by: ~SIGINT~ on August 13, 2021, 0228 UTC
Related post: Israeli Navy 8780 kHz USB 0208 UTC 13 AUG 2021 https://www.hfunderground.com/board/index.php/topic,85009.0.html (https://www.hfunderground.com/board/index.php/topic,85009.0.html)