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unid 318000Bd/228 GFSK (UHF)
Unid 318000Bd/228 GFSK spotted on 428 MHz and sent me by a friend of mineFig. 1After the removal of the scrambler x^9+x^4+1, the bitstream shows an interesting 228-bit (or 12 x 19-bit groups)...
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unid 200Bd/400 FSK bursts
Interesting 200Bd/400 FSK bursts heard on 12087.4 KHz/USB and reported by my friend Eduard (Eddy) Waters from Australia. The bitstream consists of repeated sequences of 32 bit; I did not find a...
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unid 200Bd/400 MFSK-4
Yet another interesting signal sent me by my friend Eddy from Australia. The transmission has been recorded on 16320.0 KHz/USB at 0520Z and consists of 200Bd/400 FSK-4 segments (the signal in between...
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unid 216-bit Initialization Vectors
Interesting MIL 188-110A segments which transport encrypted data. The bitstreams corresponding to the eigth segments - after 110A removal - are shown in Fig. 1; unless segments e and f, each bitstream...
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Unid MFSK-13 system
Unid MFSK-13 system running at different speeds (31/62.5/125 Baud) and intervals (125/250 Hz) spotted on Twente WebSDR on ~10625, ~9091, ~7779 KHz/USB thanks to friend radiotehnikaT101. Fig. 1Fig....
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An odd STANAG-4481F link
Odd STANAG-4481F transmissions consisting of (apparently) continuous KG-84/KIV-7 64-bit sync sequence, spotted on 11222.0 Khz (CF): this is the first stime I hear S-4481F on that frequency. These...
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async 5N1.5 STANAG-4481F in cleartext
Yet another interesting STANAG-4481F signal, this time operated in async 5N1.5 mode and in cleartext(!): first time I see a not encrypted S-4481F transmission (obviously except FABs/CARBs). Signal...
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4G-ALE Fast WALE (188-141D) and WBHF traffic (188-110D)
A necessary note due to the multiplicity of abbreviations and acronyms:WBHF: Wideband HF waveforms, as per MIL 188-110D App.D;3G-ALE: third generation ALE as per 3G-HF STANAG-4538 (FLSU and RLSU...
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Swedish STANAG-5066 client-application, a look at the DTS sublayer
(Just an update about the "Swedish Army client-application for STANAG-5066" topic) As said in the previous posts, the users employ the 3G-HF "Circuit Mode" service (STANAG-4538), data are transferred...
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Swedish STANAG-5066 client-application... (2)
(just a little update to the previous post) A further confirmation of the role of the STANAG-5066 DTS (Data Transfer Sublayer) in the duplication of D_PDUs comes from the examination of the S5066...
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weird, but intriguing, 75bps Baudot encoding with 3.8 stop bits (prob....
That's a very interesting Baudot 75Bd/850 FSK signal recorded (and sent me) by my friend cryptomaster on 6721 KHz/USB: although its nominal parameters lead to an async STANAG-4481 transmission, the...
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install, run and test GNU Octave against T207 and CIS-11 streams
updatedThis is just a quick how-to for Octave since some friends asked me for some tips about the installation and use of Octave with some analysis tools such as the ones for T207 and CIS-11 streams...
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4G-ALE async two-way point-to-point link setup
The asynchronous two-way point-to-point link setup protocol (LSU) is used to set up a link between two stations when one or both of them is scanning asynchronously. The asynchronous link setup protocol...
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a STANAG-5066 (off-line) dissector
S5066 dissector (free software licensed under the GNU General Public License - GPL) is a GNU Octave coded tool that accepts as input a filename.txt file containing a stream of ASCII 0's and 1's (no...
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15-channel DBPSK 500Bd 30KHz, CIS (wideband?) Akula
Quite rare Akula ("Shark") [1] signal catched by my friend KarapuZ. The usual Akula 500Bd/1000 FSK2 waveform is preceeded by the transmission of 15 PSK tones (MPSK-15) lasting the same time of the FSK...
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Rus PSK4 1200Bd
Transmission heard on 8741.5 KHz/USB, thanks to the KiwiSDR owned by YO3IBZ (Bucharest, Romania), on march 3rd. Although I tuned it on 8741.5 KHz I think the real tuning frequency be 8742.0 KHz (usual...
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Rus PSK4 1200Bd: solved
The questions related to the "nature" of the 1022-bit period of the QPSK 1200Bd signal (see the previous post) has been solved thanks to the help of my friend cryptomaster: I was waiting for traffic...
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dwell on STANAG-4481F is always interesting
Sometimes we overlook the usual STANAG-4481F or similar FSK signals, but they are precisely the ones that turn out to be the most interesting: just in these days I heard two STANAG-4481F transmissions...
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async STANAG-4481F with KG-84/KIV-7 encryption (DHFCS)
We are used to see (and recognize) KG-84/KIV-7 encryption in synchronous STANAG-4481F, but this time I ran across such encryption in async S-4481F (75Bd/850) transmissions heard on 8127.0 KHz (cf). The...
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Unid 100Bd/1500 FSK
Unid and unusual 100Bd/1500 FSK spotted on 4010.0 KHz (cf) on 10th march thanks to the KiwiSDR in Skerjafjörður Reykjavik; although the numerous attempts in the days to follow, unfortunately I no...
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