Clik here to view.
CIS MPSK-16, a POSTNET 2-of-5 variant?
As for the 6-bit encoding used in CIS MPSK-16 streams, see this post for background, my friend Nicholas suggested that most likely it's a variant of the 2-out-of-5 code [1], a constant-weight code that...
View ArticleClik here to view.
again about crypto devices with (5x) 128-bit Initialization Vectors
Recently in the list of the UDXF group a log of the UTE listener howardhawks (HH) appeared about transmissions of the Royal Navy of Oman (RNO) in 110A 1200bps/S mode on 8403.0 KHz/USB: nothing special...
View ArticleClik here to view.
a note about CIS Navy FSK (T-600)
My friend Nicola, whom I thank for the collaboration, reported to me an inaccuracy in the post of April 16, 2021 "CIS Navy FSK 50Bd/250 (T-600)", more precisely regarding the 44-bit sequence which is...
View ArticleClik here to view.
unid PSK8 2400Bd burst waveform
Unid PSK8 2400 Baud burst waveform spotted on 10557.0 KHz (CF) by using OZ1AEF KiwiSDR (Skanderborg, Denmark). ACF value is 293.4 ms, which makes a period length of 704 tribit symbols or 2112-bit...
View ArticleClik here to view.
4339.8 KHz, an occasional French-Ny fleet broadcast FSK channel ?
On Sunday evening I came across an FSK 50Bd/850 transmission on 4339.8 KHz (CF): first time I have ever seen a S-4481 on this frequency, usually occupied by French Navy fleet broadcast in STANAG-4285...
View ArticleClik here to view.
unid OFDM-121 system
Unid Russian OFDM-121 system recently heard on 11071.0 KHz (CF) until monday morning, frequency spacing between channels is 25 Hz, symbol rate in channels is 21 Baud, the used modulation seems to be a...
View ArticleClik here to view.
Harris RF-5800 Digital Voice PSK8 serial waveform (yet another 106.6 ms ACF)
A friend of mine sent me these signals consisting of a complete session utilizing the Harris 600/2400 bps Digital Voice (DV) mode:1- selcall & link setup2- 600/2400 bps vocoder PSK segments3- link...
View ArticleClik here to view.
THALES Robust MFSK-8, TRC-1752 STANAG-4285 FEC, STANAG-4539
Interesting sessions recorded some days ago on 9072.0 KHz (CF) consisting of an initial THALES Robust MFSK-8 session followed by THALES TRC-1752 STANAG-4285 + STANAG-4539 encrypeted traffic, the latter...
View ArticleClik here to view.
HARRIS PSK8 2400 Bd Digital Voice, an autobaud waveform?
Discussing with my fiend ANgazu about the HARRIS Digital Voice waveform (see this post), it turns out that likely that waveform is designed to provide the autobaud feature which is coded - in our...
View ArticleClik here to view.
Notes about Akula (v. 291121b)
My friend Nicola, with whom we often collaborate and whom I thank here, has been studying Akula's code for several months now and recently sent me a paper related to his work: I am very happy to...
View ArticleClik here to view.
THALES Skymaster, "skyhopper" mode
This is a fairly comprehensive list of the ALE waveforms provided by Thales' Systeme 3000 Series Skymaster and Skyhopper Modes, a set of procedures and adaptive waveforms that allow to offer reliable...
View ArticleClik here to view.
CIS 2400Bd serial bursts
Just to point out some differences bewteen these two types of CIS bursts (figure 1) :* the ones sent in group or in front of the OFDM-121 * the ones sent individually or before Serdolik MFSK/OFDM Fig....
View ArticleClik here to view.
Chinese PSK2 2400Bd serial waveform
This is my follow-up to an interesting post discussed on the radioscanner.ru forum about a PSK2 transmission of the Chinese Navy and started by my friend KarapuZ [1]. The raw demodulated stream...
View ArticleClik here to view.
unid 500Bd/1000 FSK ARQ network
This is an interesting "Akula-like" FSK waveform spotted by my friend cryptomaster on 7370 KHz/usb (41 mt broadcast band!), the signals are keyed at the speed of 500 Baud with frequency spacing of 1000...
View ArticleClik here to view.
UK DHFCS St.Eval running the Aus 600Bd/850 FSK waveform
Since a few days ago, approximately from the fourth week of December, on 2815.0 KHz (CF) it's possible to receive a strong and continuous 600Bd/850 FSK transmissions which is likely a fleet broadcast...
View ArticleClik here to view.
Yet another 75Bd (actual 50)/850 FSK
Yet another 75Bd (actual 50)/850 FSK bearing KW-46 encrypted broadcast spotted on 5189.50 KHz CF, this time probably(?!) sourced from some France AF base (figure 2). The reason of that "format" is...
View ArticleClik here to view.
odd 16 times expanded 5N1 framing (UK DHFCS)
Rather curious pattern transmitted by the UK DHFCS site in Crimond on 4538.0 KHz/USB, reported to me by friend Linkz, using the STANAG-4285 waveform at 1200 bps/L submode: it's about a 16 times...
View ArticleClik here to view.
a curious STANAG-4285 transmission
Really curious STANAG-4285 transmission sent me by my friend IK1YDE Andrea who was the first to spot and analyze the signal. The oddity is that, after S4285 demodulation, the Initialization Vectors, as...
View ArticleClik here to view.
IoT on HF NVIS (tentative)
I56578, ANgazuThe Antarctica department of La Salle Campus, Ramon Llull University of Barcelona has been carrying out studies for some years, among which we are interested in the communications part....
View ArticleClik here to view.
112-bit period stream To 5N1 frames (just for fun)
I recently re-thinked to the odd 112-bit period stream sent by UK MoD via STANAG-4285 and described here, more than anything else I was intrigued by the "stuff" used for the manipulation of the...
View Article