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eavesdropping the wheels, a close look at TPMS signals
(ANgazu, Rapidbit, i56578) My friend ANgazu encouraged me to have a more close look at the signals that populate the V/UHF world and possibly begin to analyze some of them. He invited me to collaborate...
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06233.0: ---: Unid 0622 USB 3G-HF 2-way FLSU handshake / LDL128 tranfser, Harris "citadel" encrypted 811 bytes file (03Ago17) (AAI) (AAI)06247.4: HWK01: Swedish Armed Forces, S 0632 USB 3G-HF 1-way...
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a weird 3G-2G scenario or a likewise weird coincidence?
For interoperation with legacy systems, STANAG-4538 stations must be capable of accepting and establishing logical links using the second generation Automatic Link Establishment (2G-ALE) protocol...
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3G link + S5066: example of Circuit Mode (HF2000, Swedish Army)
next > Nice example of how to send STANAG-5066 data on a 3G link, using the Circuit Mode service provided by the 3G-HF STANAG-4538 profile.The link is established with the 2-way FLSU procedure: the...
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PWZ-33 Bazilian Navy and Pactor-FEC frame lengths
Some days ago my friend KarapuZ pointed my attention on a FSK transmission running on 8582.0 KHz/USB and that, at a first glance, appeared a bit uncommon. Once analyzed and decoded it was identified as...
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unid burst waveform, BPSK 4800Bd / 6KHz Bandwidth
Bursts copied on USB 16975.0 and 17157.0 KHz, in the 16-17 MHz Marine band segment. The waveform uses BPSK modulation at 4800 Baud and a bandwidth of 6 Khz, the copied bursts have a duration of ~386...
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K4MT/NT9P Net, Russian Intel/Diplo (M42b)
K4MT/NT9P network, also known as Enigma designator M42b, is a quite common Russian Intel/Diplo network which uses both CW-Morse and FSK 50Bd/500: I spotted several trasnmissions this morning on 12164.0...
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MFSK 21/13 tones 31.5/63 Bd (125 and 250 Hz spaced)
unid MFSK modem spotted on 12138.8 KHz/USB, according to the suppressed carrier during MFSK, and switching from 21-tones 31.5Bd (125Hz shift) to 13-tones 63Bd (250Hz shift). Note also the espansion of...
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Logs
05775.0: RCV: Russian Navy HQ Black Sea Fleet, RUS 1912 CW, "RIC87 DE RCV QTC 209 8 7 0915 209 = ..."06248.8: HWK01: Swedish Armed Forces, S 0632 USB 3G-HF 1-way FLSU / MIL 188-110A Serial, Circuit...
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unid STANAG-5066 RCOP/UDOP client, Swedish Army (update-3)
wrapper protocol MTU and data-block length As shown in Figure 1, if the length of the data-block is longer than the max allowed value (1977 bytes in this case) it is segmented into smaller blocks. The...
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TE-204 (Rockwell AN/USC-11) 75Bd in-band frequency and time diversity HF modem
TE-204 (AN/USC-11) is most commonly used by Allied Air Forces as an air-to-ground messaging system as well as in ground and naval applications. The transmission was heard on 11220.0 KHz/USB, HF-GCS...
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(unid) GMSK/PSK-2 2380Bd hybdrid HF modem
Odd burst waveform spotted on 5398.2 KHz/USB at different times and SNRs, the better around 2200Z 23 September.Unless some little variations, bursts have a duration of ~720 msec and are spaced by a 500...
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Nokia M/90 (Panasonic CF-U1): FSK 301-151Bd 780Hz shift
I reported Nokia M/90 / Panasonic CF-U1 301-401Bd/780Hz in this post, this time I copied the 301-151Bd waveform on 10737.7 KHz (cf) around 1235 UTC. In this sample the initial 301Bd burst seems to be...
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Chinese PSK-2 ...and errors in its baud rate measurement
Some days ago I had a talk (...email exchange) with my friend KarapuZ about the way to get correct measurements of the baud rate in noisy signals or in uncommon waveforms. I always relied on the tools...
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MS-110A & S-4539 adaptive HF modem
Interesting proprietary adaptive HF modem spotted on 6670.0 KHz/USB. The modem uses a set of modified waveforms from 188-110A and STANAG-4539 and switches from 300bps (MS-110A) up to M4800 modes...
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Logs
04215.5 IDR: Italian Navy S. Rosa Rome, I 1555 (cf) FSK 75Bd/850 CARBs "IDR04I(0)/IDR23 /IDR22 /IDR03I(0)/IDR02I(0)/IDR21/" (24Sep17) (AAI)05398.2: ---: Unid 2000 USB GMSK/PSK-2 2380Bd hybrid modem...
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unid STANAG-5066 RCOP/UDOP client, Swedish Army (update-4)
[read all the posts about this topic]data blockAdding the data blocks to form a single file show a repeated 33-byte length pattern which precedes the "magic string", probably a common heading to all...
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THALES mention
happy to be mentioned by THALES in their HFXL modem "Sea Trials" presentation during the last HFIA meeting in Kjeller Norway on 8 September 2017. Thanks to Catherine LAMY-BERGOT, from THALES, who...
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OFDM modem 12+12 tones 48Bd (Marconi 25-tones)
Probably a simplex transmission heard on 6246.5 KHz/USB. Although the SNR is poor, it's possible to see a central un-modulated tone a + 1500Hz that splits the signal in two identical parts which I...
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ISB ARQ system heard in the 6 MHz maritime band
Robust ISB ARQ system heard on 6231.5 KHz/USB (Maritime Mobile band) 2800Hz offset from carrier, around 0630z on 12 October and in which the two side bands are used as follows:- on USB: user data...
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