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Logs 27 Feb - 20 Mar
06831.0: C500: Unid 0739 USB 188-141A, sounding (27Feb18) (AAI)06849.5: ---: prob. Russian Air Force 0715 (cf) FSK 100Bd/2000 (01Mar18) (AAI)06850.0: ---: Ukraine Militay, UKR 0755 USB MFSK-4 (double...
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unid 1536-bit secondary protocol
In most cases, STANAG-4285 transmissions running at 1200bps/L or 2400bps/L carry a data protocol with a period of 1536 bits, most likely a multiplex system (TDM) capable of carrying up to 192 channels...
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scrambling and descrambling
(The polynomial theory which scramblers are based on is beyond the scope of this post, for those who want to deepen, google offers a lot of documentation about it. The aim is just to show their...
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unid 3-of-6 multitone system (tentative)
28 Mar updateThe MFSK-6 modem seems to be entered in production mode: spotted today on 10222.0 KHz/USB with no repetitions of the same pattern, as noted in the precedent intercepts. Note as the system...
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FSK 500Bd/1000, CIS Navy Akula ("shark")
CIS Akula ("Shark") is a FSK 500Bd/1000 burst waveform used by Russian/CIS Navy in ship-shore links, most likely by submarines. Akula is one of the most interesting signals you may meet in air: fast,...
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Asynchronous STANAG-4285 15/128 bit period (possibly Turkish T-15)
6234 Khz/USB STANAG-4285 600bpsL, very long idling periods (hours!) with sporadic asynchronous data transfers consisting of 15 bit and apparently nx32 bit (32,64,...,128) ACF blocks (Fig. 1). The...
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3GWB, 3G ALE extensions for wideband operations (Harris WB ALE)
I was investigating some wideband HF (WBHF) scenarios and spotted unexpected 3G-HF FLSU bursts in some recordings: it's a unexpected presence because for circuit mode connections WBHF is not comprised...
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188-110A 2400S (prob. Egypt-Ny)
slightly modified 188-110A bursts with some voice comms in Arabic, prob. from Egyptian Ny, spotted on 15950.0 KHz/USB 1320z.It's interesting to note the well visible three 200ms synchronization pattern...
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WBHF comms in the 9 MHz band (188-110C/D Appendix D)
Just a couple of good quality recordings of the wideband activity that can be monitored in 9 MHz band. Both the waveforms belong to WBHF 188-110C/D App.D.The 6 KHz burst is modulated at a symbol rate...
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FSK two channels in F7B mode, likely an UKR-Net
On 13960.0 KHz I tuned an apparently MFSK-4 100Bd/1000 transmission spreading about 3000Hz bandwidth: tones at -1500, -500, +500, +1500. After emails exchange with friends, "cryptomaster" from...
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FSK-2 300Bd/200, 17-bit ACF 6-bit code
FSK-2 300Bd/200 transfer occupying ~500Hz bandwidth, each cycle lasts 6000ms (4640ms data block, 1360ms idling) and shows 17-bit length ACF. Each data block consists of 738 bits (data + framing), data...
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Logs, 20 Mar - 22 Apr
04593.0: RDP: Saudi Air Force, ARS 2108 USB 188-141A, calling DAI (23Mar18) 05553.2: ---: Unid 2120 USB STANAG-4285 1200bps/L modem, unid 1536-bit secondary protocol (prob. TDM system) (23Mar18)...
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UUCP protocol 'conversations' over HF (BPOL)
This post is intended to complete some previous analysis of the protocols used by the German BPOL for their HF ship-shore communications which are based on the R&S implementation of the X.25...
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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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Telsy/Q-MAC MPSK 30+1 48.8Bd 60Hzi56578, DF3LZ,KarapuZ
Radio-check bewteen voice callsigns GAMMA 130 and ROSTRO 530 (respectively It-GdF shore station and patrol-boat) followed by short MPSK blocks, most likely digital voice. The MPSK signal occupies a...
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unid PSK-8 bursts systems (heard recently)
8040.0/usb 0755z 188-110A Serial, long sequence of 1200ms bursts (noise by adiacent Northwood HF-fax) bearing the same sequencehttps://yadi.sk/d/WcrZVwFU3VkzfT 11072.0 CF PSK-8 2800Bd, two stations...
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MIL 188-220 Appendix D, standards for COMSEC transmissions
A recent post in radioscanner (my nickname is "ansanto" there), and some interesting discussions with a friend of mine, gave me the opportunity to study that signal and deepen the theme that is dealt...
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Exploring FSK 50Bd/850 transmissions for STANAG-5065 and KW-46 encryption
Although STANAG-5065 indicates the standards required for naval LF shore-to-ship broadcast with KW-46 encryption devices [1], some implementations of this standards can also be found in HF waveforms...
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French Navy Broadcast, FSK 50Bd/850
Following the previous post, I decided to analyze the French FSK 50Bd/850 in order to replicate the results obtained by my friend Christoph Mayer in his blog: happy to say that the results...
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NATO naval broadcast and KW-46 encryption
This post goes to complete the one of Christoph where he noticed the presence of LFSR delimited 7-bit frames in STANAG-4285 payloads. Now, given that: 1) the HF waveform STANAG-4285 is largely used for...
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