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unid QPSK 9KHz 4800Bd
Just working on the wideband signal spotted by Christoph first on 10160.0 KHz (cf) and more in detail discussed here in his blog. Replied his same results: period consisting of 984 bits (492 symbols)...
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110A 2400bps modem carrying 1536-bit protocol
Signal recorded on 14600.0 KHz/USB tranks to the KiwiSDR http://collie2.ddns.net:8073/ located in Western Australia. The used HF waveform is 188-110A Serial in 2400 bps mode, note the 48 symbols length...
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what a blunder :)
some days ago I went on a S4285 modem running on 4271.0 KHz/USB in 600bps/L submode. Bitstream after demodulation showed a 2163-bit length period: clearly a test tape. Once reshaped, an asynchronous...
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KG-STV MSK 1200Bd/600 (via Qatar-OSCAR 100)
KG-STV is a digital SSTV system developed by JJ0OBZ (K.G. from Japan). Unlike the analog SSTV, which scans the image line by line, KG scans the image in blocks of 16x16 pixels, i.e. 15 scan lines each...
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Defence Australia 188-110 Serial transmissions
The Australian 188-110A Serial running on 14385.0 KHz/USB (600bps KW-46/KIV-7M secured broadcast) and 10407.0 KHz/USB (2400bps 1536-bit TDM protocol), already discussed here, are most likely originated...
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CIS-75 FSK 75Bd/250
CIS-75-75/250 is a Russian/CIS system supposed in use by Military in HF. As its name, this system use F1B modulation with 250 Hz shift and 75 bps speed, most likely a broadcast with linear encryption...
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OFDM-80 30Bd/37.5Hz
Unid (to me) OFDM 80-tones 30Bd/37.5Hz K=1/4, spotted with good SNR on 9400 KHz (cf) and resampled to 9600 Hz.Fig. 1Some channels show a clear PSK2 modulation while in other channels I could not...
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CIS-75 FSK 75Bd/250, LFSR 128-bit sequence (tentative)
This post is a follow-on of the previous one and shows some findings due to the collaboration between myself and my friend Valentin (cryptomaster).We saw that CIS-75 uses a 128-bit length pseudo-random...
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6 KHz wideband OFDM-160 PSK2/QAM-16
6 KHz wideband OFDM-160 30.469 Bd/37.5 Hz PSK2 & QAM-16 spotted on 10342 KHz (CF), probably it's connectd to the OFDM-80 seen a few days ago. Some packages of this transmission have PSK2...
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STANAG-4285, async Turkish "T-15"
05300.0 KHz/USB (intruding the 60mt amateur band), Turkish Mil prob. from Izmir area, TUR. STANAG-4285 600bps/L carryng async 5N1.5 (Turkish "T-15") stream: most likely encrypted pseudo-random naval...
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CIS Makhovik (T-230) in CIS-12 and PSK2/1200bps waveforms
Recently my friend KarapuZ gave me the chance to analyze a CIS-12 bitstream and I took the opportunity to wotk on the "format" of Makhovik and then compare the CIS-12 stream with other Makhovik...
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NILE/Link-22 168-bit packets (STANAG-4539 TDMA WF2 waveform)
For background it might be helpful to read the posts:TDMA waveforms, Annex D to STANAG4539 NILE/Link-22 traffic waveform #2 In the sample being analyzed, the 270 symbols of the Media Code Frames are...
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async FLSU call followed by STANAG-4197 (3G-HF "circuit mode")
This transmission was logged and recorded by my friend DK8OK Nils on 11228.0 KHz/USB, and refers to op-comms between "INY" Trapani-Birgi airport and "DHN66" Neuteveren/Geilenkirchen NATO air base (INY...
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Baudot FSK 100Bd/500 (unid Rus Gov/Mil)
Interesting async ITA2 5N1.5 FSK 100Bd/500 tuned on 11019.0 Khz some days ago. Once demodulated, the content consists of (off-line) encrypted 5LGs groups. Note also the slight deviation of the...
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Indian Navy STANAG-4285 naval broadcasts (tentative)
Follwing a tip from my friend KarapuZ and his recent tweet, I started to monitor 16941.0 KHz to study the STANAG-4285 naval broadcasts from the Indian Navy [1]. They use the quite rare 2400bps/Long...
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Unid FSK 400 (401)Bd/800 bursts
Unid FSK 400Bd (401)/800 bursts spotted on 13224.0 Khz (cf + 1700), slight distorsion in the speed. ACF=0, no other results if demodulated using differential mode. Transmissions are not frequent and...
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Speed distortion in an FSK signal
Most likely modem instability is the cause of the distortion in the manipulation speed (~42 bps), as it's evident in SA raster.https://yadi.sk/d/qT-d1A_5bFtJHg
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COMSEC transmissions using a S4285 variant (2)
Secured burst transmission using a modified S4285 waveform [1] spotted around midnight on 4015 KHz/usb, the S4285 mode is 600bps and short interleaver. Fig. 1After demodulation, the COMSEC preamble...
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unid SkyOFDM 28-tone 86Hz 65.6Bd PSK2
Continuous ofdm bursts transmission picked up on 4158 KHz/USB thanks to the "ArcticSDR" in Kongsfjord Arctic Norway: a KiwiSDR managed by my friend Bjarne Mjeldehttp://arcticsdr.ddns.net:8073/...
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SkyOFDM 28-tone 86Hz 65.6Bd PSK2 (2)
Just for background it might be helpful to read the previous post.Most likely the signal that is continuously transmitted on 4150 KHz/usb is a modded or a new waveform of the Skysweep Technologies...
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