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14 November 2024

unid FSK 50Bd/612 bursts

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Interesting and unid transmissions consisting of 50Bd/612(600?) FSK bursts heard by me and my friend cryptomaster a few days ago, respectiv...
24 October 2024

Chinese 4x4 modem (probably PLA Navy)

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Chinese 4x4 waveform consisting of two groups of four PSK channels modulated at a rate of 75 Bd, the two groups are spaced by 450 Hz and cha...
27 September 2024

QPSK & "SPIDER HF" MFSK8 waveforms (ROK Military)

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I monitored the 8235.0 KHz/USB frequency (maritime band) since some days using some remote KiwiSDRs in Oita, Okayama (both Japan) and Daegu ...
30 August 2024

Citadel II encryption in sync/async MS-110A transmissions (Algerian AF)

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Altought it was introduced in 2004 [1], so far I had always seen the Citadel II encryption algorithm occur in 3G-ALE/STANAG-4538 contexts wh...
26 August 2024

about the unid 32-bit protocol used in S-4538 + MS-110A transfers

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This is the third time I have encountered these transmissions [1] and, given the good number of recordings made over a few days on the frequ...
31 July 2024

unid FSK 300Bd/300 bursts

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Interesting and unidentified FSK 300Bd/300 bursts heard on ~14490 KHz and sent to me by my friends ANgazu and cryptomaster (Figure 1). Fig....
19 July 2024

CIS-1200 SDPSK 1200Bd ("Makhovik", T-230-1A)

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updated (23 July 2024) This transmission, along with a probably spurius emission 600 Hz above, was recorded on 13002.5 KHz (cf) thanks to t...
16 July 2024

MS-110D App.D (WBHF) transmissions, Collins Aerospace over-the-air testing? (2)

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Yet another MS-110D sample [1] transmitted from Oxford Junction (IA) site, recorded on 19825.7 KHz/USB and sent me by my friend linkz : this...