service announcement
Dear Mr. Timothythank you so much for contacting me, I tried to reply to your email address but unfortunately your mailgate probably does not allow "external" mailer and thus I received an access...
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19.5Bd/100 FSK: Rus R-397 “IRTYSH” (“ИРТЫШ”)
About one years ago (may 2020) I came across a short 19.5Bd/100 FSK [1] which, at that time, I chalked up to a some Russian-Mil network. Well, an anonymous reader of the blog, whom I thank, left a link...
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5N1 frames To 112-bit period stream (just for fun, again)
This post is the follow up, and the counterpart, of the previous one (112-bit T stream To 5N1 frames, just read it for background). If while receiving we need a "downsampling" by a factor of 16 of the...
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STANAG-5066 over MIL 188-110A: SK AF messaging
Slovakian AF communications spotted on Monday at 6343.0 KHz/usb, rather unusual frequency given the previous logs (actually first time heard on this qrg) and no more heard since last monday 21. The...
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1200Bd/800 Russian tactical datalink
Interesting 1200Bd/800 "FSK" (apparently) transmissions spotted and monitored on 7980.0 KHz/usb from monday feb. 28th until march 2nd when it disappeared. The heard signal is a Russian "tactical data...
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1200Bd/800 Russian tactical datalink (2)
My friend UDXF @pir34 and I are monitoring different frequencies which are supposedly changed on a day/night basis, but not just that. We have noticed that the transmissions take place from at least...
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Rus Datalink: a parsing approach
Just a few unpretending notes as a result of web searches regarding the datalink signal, we have currently been monitoring, in particular about the format (69,48), where 48 bits are data, that for...
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THALES XL modem, channels time lag
Thales HF XL SALAMANDRE (1) test transmissions spotted by my friend Geoff (who kindly sent me his recordings) on the upper limit of the 6 MHz band. In these tests the modems are able to use 16...
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Rus Datalink: a parsing approach
Just a few unpretending notes as a result of web searches regarding the datalink signal, we have currently been monitoring, in particular about the format (69,48), where 48 bits are data, that for...
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Akula: a quite unusual session
Quite unusual session of Rus-Ny "Akula" 500Bd/1000 FSK characterized by the continuous transmission of only the lowest tone before and after the messages (see figure 1), just like some Rus-Ny 50Bd/200...
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1016-protocol & DatronLINK suite to exchange HF email (R.O.C. Navy)
Yet another interesting catch of an email-over-HF session, this time recorded on 14360.0 KHz/LSB at 1608z [1]. The usual procedure is used: logical link setup by 2G-ALE 188-141A 3-way handshake (SADLW...
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a curious 8N1 async 188-110A transmission (MoD RK)
Interesting recording of a Kazakh-Mil transmission sent to me by my friend cryptomaster. The transmission was heard on 10213.0 KHz / USB at 0656 UTC and dates back to March 2021: not as recent but...
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Some comments about the German Navy STANAG-4285 fleet broadcast
I noticed that in their STANAG-4285 600bps/Short fleet broadcast the German Navy use a 7-bit framing consisting of [5-bit data] + [one parity bit (even parity)] + [one pahsing bit], such framed stream...
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"Akula" almost always holds surprises
"Akula" almost always holds surprises when it happens to came across its transmissions, is the case of a recording kindly sent me by my friend ANgazu that is characterized by at least three points:1)...
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unid 150-300Bd/509 FSK
Since some days me and my friend Cryptomaster are discussing an FSK signal detected on 6511.50 Khz (CF). Transmissions starts (and ends) with a long reversals sending at 150 baud speed, messages are...
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Thales HDR Single Tone modem? (TRC-3600/3700 family)
I rcently spent a bit of time monitoring the data transfer sessions which frequently happen on 6478.0 KHz/usb in ARQ mode. As usual, transfers start with the link setup stage: the particular and...
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STANAG-5066 over MIL 188-110A: Polish CD/TDF messaging
I spent some days monitoring the transmissions of a Polish net on 5094.0 KHz/USB, traffic occurs mainly in the morning from Monday to Friday and consists of ALE link setup followed by voice...
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Notes on Russian-Ukrainian Datalink (by Nicola)
I received from my friend Nicola, and gladly publish it, his work on Russian-Ukrainian Datalink.When reading these notes, one should be aware that they have been pieced together from numerous sources...
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unid 2400Bd/1200 MSK signals
Unid transmissions heard on 14669.0 KHz and 14693.0 KHz (USB) around 0800-0900 UTC. At first glance the signals may appear to be a PSK-4 modulation, as indicated by the fourth degree harmonics and...
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CIS-48 calls & OFDM transfers
Interesting and good quality recording sent me by my friend Ary from UDXF group, whom I thank. The initial so-called CIS-48 probes/markers, that presumably(!) act as "calls", are sent at regular...
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