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T207_test
Finally a useful and fast tool to check the presence of T207 encoding in FSK bitstreams. The tool T207_test runs on Octave, a programming language for scientific computing, and was originally - and...
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MIL 188-110C App.D: 9KHz/7200Bd & 12KHz/9600Bd
9KHz/7200Bd & 12KHz/9600Bd WBHF waveforms spotted on 9 MHz band. Both the ACFs show a value of 120ms that corresponds to 864 symbols for the 7200 Bd waveform (768 uk + 96k) and 1152 symbols for the...
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Nokia msg terminal + Tadiran HF equipment
Transmission picked up some days ago by my friend AngazU using the SM2BYC Kiwi sdr. The signal is composed of an initial tone followed by a preamble consisting of F7B modulation (apparently MFSK-4) and...
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CIS-12 TDoA measurements using GPS time-stamped IQ samples from KiwiSDRs
TDOA (Time Difference Of Arrival), also known as multilateration, is a well-established technique for the geolocation of RF emitters. Using three or more receivers, TDOA algorithms locate a signal...
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TDMA waveforms (STANAG-4539 Annex D,...) and NILE/Link-22
Recently, some friends and me happened to run into QPSK and 8PSK burst waveforms that are among those described by STANAG-4539 for TDMA operations (Time Division Multiple Access) and that are used by...
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STANAG-4539: unexpected data rate of 12800 bps
Long transmission (hours) of STANAG-4539 8PSK 2400 Bd bursts spotted on 14 June morning on 7807.2/usb: each burst lasting 1680 ms and composed of 13 x 287 tribit symbols frames. It's interesting to...
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STANAG-4285 128 bit 1536F protocol (UK MoD?)
I followed these STANAG-4285 transmissions on 14548.2/usb throughout the morning and the first part of the afternoon. Unlike similar S-4285 broadcasts, there is not a continuous broadcast and the...
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(few) logs 23 Apr - 19 Jun
04538.0: ---: Russian Navy, RUS 2044 (CF) FSK 500Bd/1000 "Akula" (30Apr18) (AAI)04553.5: ZLST: Zoll Leitstelle Cuxhaven, D 2049 USB 188-141A calling ZPRI Zollboot Priwall (30Apr18) (AAI)06298.7: ---:...
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redefining T-207 checksums
T-207 is a multiplexed two channels "system" and can be connected to several modems therefore it can be found in several FSK waveforms. Since the lack of official documentation it's difficult to say...
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COMSEC transmissions using a S4285 variant (poss. Croatian-Mil)
Encrypted transmissions on 6931.0/usb which use a slightly modified 4285 waveform with 4 preamble tones and running 600bps/Short sub-mode. Transmissions are between two stations in simplex, are quite...
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unid FSK 75Bd/250
Unusual noncoherent FSK 75Bd/250 system spotted on 14116.0 (CF), apparently coming from North-West Russia, with a 14-bit period bitstream. It's not sourced from T-107 equipment neither successfully...
View ArticleTDoA howto (tested on Ubuntu Linux 12.04)
howto compute TDoA maps with GPS enabled KiwiSDR servers around the world using Christoph Mayer TDoA scripts and his forked "kiwiclient" python stuff...
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Link-11 SLEW, KG-40A encryption
TADIL-A/Link-11 SLEW half-duplex transmissions spotted on 8223.5/usb (July, 3). Demodulated stream has a 252-bit period that likely is due to KG-40A, a crypto device which is just used to provide...
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CIS-12 & CIS Selcall FSK 150Bd/200 ("Vishnya")
Interesting and quite rare CIS-12 & CIS Selcall FSK 150Bd/200 - aka "Vishnya" - picked up by my friend AngazU using northern Europe KiwiSDRs in the 5 MHz band. Also thanks to friends cryptomaster...
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110A & S4539 data transfers
06690.0/usb 0627z: two unid stations in simplex exchanging KG-84 encrypted msgs using 188-110A and S4539 waveforms. The exchanges were repeated several times during the morning w/out ALE handshake...
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MFSK-32 & OFDM 60-tone, a new "Serdolik" waveform ?
Interesting transmissions centered on 7659.0 KHz (7657.0/usb as tuning frequency) and picked up with a KiwiSDR located in Northen Norway (Kongsdr).Transmissions consist of MFSK-32 87Bd/97Hz and OFDM...
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LINK-11 CLEW, conventional waveform
The 16 tone frequencies used by CLEW are 605 Hz (used for Doppler correction), 2915 Hz (used for data and synchronization) and 935, 1045, 1155, 1265, 1375, 1485, 1705, 1815, 1925, 2035, 2145, 2255, and...
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the unid Kongsfjord OFDM (1)
If you open the Norwegian Kongsfjord kiwiReceiver and tune to 468 kHz/usb you will find a continous signal 12 kHz wide with a carrrier at +1,5 kHz from the lower edge and two smaller carriers at the...
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FED-1052 to deliver IDEA encrypted HF email (likely Swiss Army)
Interesting transmission heard on 15888.0 KHz/usb at 0734z likely from Swiss Army units (callsigns ZJ1, ZA1) and consisting of a 188-141A "linking protection" handshake followed by 188-110A...
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188-110C/D Appendix D, waveform Id 0 (ortogonal Walsh modulation)
9213.0/usb: 188-110C/D Appendix D waveform Id 0 (WID0) using ortogonal Walsh modulation in preamble section and in data blocks. The use of this waveform leads to think to poor channel...
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