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Unid FSK 35.5Bd/1000
Unid FSK 35.5Bd/1000 heard in idling mode on 10550 KHz (CF) and recorded using the KiwiSDR located in Kuopio, Finland.The raster shows a distortion of the manipulation speed which is also visible in...
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Israeli Navy running their proprietary PSK serial tone with Tadiran/Elbit DCS...
Reading radioscanner.ru I found an interesting post my friend Cryptomaster about Israeli Defense Force (IDF) Navy transmissions consisting of their proprietary PSK serial tone waveform sent along with...
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Interesting MS-110D App.D (WBHF) traffic
Interesting traffic heard on 5750 KHz/USB and picked up thanks to the UK KiwiSDR owned by G8JNJ.Most of the signals are definitely "110C Appendix D" 3 KHz BW waveform (WID 1 or 2, BPSK). The...
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3 x 7-bit KW-46 secured channels over STANAG-4481F, NRTF Niscemicryptomaster,...
This post may be considered as a continuation of an interesting analysis started by my friends cryptomaster and KarapuZ, see the radioscanner post for background. The signals analyzed by my friends...
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Makhovik secured CIS PSK2/1200Bd
This post is an update and a correction to a previous post to which reference. I want to thank an anonymous reader who in his comment to that post suggested to use differential PSK2 decoding.In that...
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Again about the STANAG-4481F transmissions from NRTF Niscemi
(cryptomaster, I56578. KarapuZ)STANAG-4481F on 18370 KHz from NPN US Navy, GuamThis is an update and just some remarks to a previous post post which I reference for background. All frequencies are CF...
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few comments on the secured 50-75Bd/850 FSK transmissions
Just to spend a bit of time during this ugly period, I thought I'd take a look at the naval BRASS systems (1) that use the FSK waveforms 50Bd/850 and 75Bd/850 (STANAG-4481F) as well as the crypto...
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F7B with mixed offsets mode (likely Ukr nets)
Some days ago my friend Mike (mco) sent me an interesting record about a seeming MFSK-4 signal (fig. 1) originating north of Rivne, Ukraine; such (duplex) transmissions are frequently heard on...
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STANAG-4285 async 1200bps test transmissions from Turkey
For about a week I monitored STANAG-4285 1200bps async transmissions heard on several frequencies in the 6 MHz band according to Table I; after April 23th the transmissions have stopped (at least in...
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yet another odd STANAG-4481F channel
6732.0 KHz: another STANAG-4481F KW-46 secured channel that use the odd 3-bit pattern discussed here. This one is most likely from AJE (Barford St, John, UK) and // with 8204.5 KHz from NSY (Niscemi,...
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(slow) 19.5Bd/97Hz FSK, likely a Russian-Mil network
19.5Bd/97Hz (slow) FSK waveform spotted on 5331.0 KHz followed by opchat in Morse:"RGJV de PZSF QSY 17542 K"Source is probably some Russian-Mil network. Transmission consists of a repeated 126-bit...
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unid 200Bd/800 FSK
Odd and unid (to me) 200Bd/800 FSK spotted this morning on 5094.7 KHz (CF). ACF shows a transmission period of 15 bit: 111101011100101Apparently, no relevant results after defferential decoding or...
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unid 200Bd/800 FSK (2)
(see the previous post for background) My friend cryptomaster suggested me an interesting way to measure and analyze the two component frequencies of the 200Bd/800 FSK signal by using the VMW module of...
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NATO 75Bd & 50Bd FSK: F1F2 phase
I decided to replicate the analysis of the phase of the two FSK tones shown in the previous post by taking a look at the NATO 75Bd & 50Bd FSK transmissions just because only in the latter the...
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Saab Grintek MHF-50 "preamble" variant
Saab Grintek MHF-50 variant recorded on 8603.0 KHz/USB using the KiwiSDR located at TWR Kempton Park, South Africa: notice that 8603.0 Khz is believed to be one of working channels used by South...
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50Bd/500 FSK (likely CIS Gov/Mil)
Unid (likely CIS) 50Bd/500 FSK message recorded on 12221 KHz (cf) at 1035z using the KiwiSDR "nsk" located near Novosibirsk, Russia. Notice the LFSR sequences generated by the polynomials x^7 + x^5 +x...
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200Bd/1000 FSK Rus-Intel 288-bit (F06x)
200Bd/1000 FSK Rus-Intel 288-bit (aka Enigma F06x) transfers with a slightly different pattern, although all recognized by Rivet [1]. Each frame starts with a 32-bit (4 bytes) sync sequence...
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CIS Navy 50Bd/500 FSK 136 bit (T600-136)
Yet another 50Bd/500 FSK transmission, this time recorded monday morning on 14704.0 KHz (cf) around 1340Z and almost surely sourced by the CIS Navy T600 system (typical shifts: 200, 250, and 500 Hz):...
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unid 40.4Bd/800 FSK & FSK/Morse
6800.0 KHz (cf): unusual 40.4Bd/800 FSK long time reversals then into FSK/Morse "UUG4 de UTN7 ZC GB 73 SK" and off-air. Most likely a CIS network. Comments are welcome 😄https://yadi.sk/d/_rDhD9tcSToU6Q
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CIS-75 FSK 75Bd/250 (3): 126-bit LFSR sequence
(for background, read all the posts of this topic)Russ-Mil CIS-75 75Bd/250 FSK system spotted this morning on 15832.0 KHz (cf). After differential decoding, the bitstream shows a clear 385-bit period...
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