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27 January 2026

MEROD FSK 100Bd/600 (Indian BSF)

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FSK 100Bd/600 signal (thanks to KarapuZ) A few days ago my friend KarapuZ posted an interesting recording of a 100Bd/600 FSK signal which t...
12 January 2026

UDP datagrams sent via STANAG-5066 (2)

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For background read the  previous post I ended the previous post hoping to recover new transmissions to understand more about the used appli...
23 December 2025

UDP datagrams sent via STANAG-5066 over async MS-110A (IP over HF)

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This is a casual catch while I was exploring the 14 MHz band (14963.5 KHz/USB to be precise): the data transmission occurred after the usual...
4 comments:
16 December 2025

A new Russian PSK8 serial waveform

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Some days ago my friend cryptomaster sent me an interesting recording dated December 4, 2025 about a test of new communications equipment c...
30 November 2025

STANAG-4538 LDL packets retransmissions, an interesting case

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A few days ago I was casually watching the 4 MHz band when an unusually long STANAG-4538 (3G-HF) transmission on 4561.0 KHz/USB caught my at...
11 November 2025

UK DHFCS FSK 800Bd/850 & STANAG-4285 1200bps/L

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Interesting and unknown (at least for me) FSK transmission in 800Bd/850Hz mode sent to me by my friend cryptomaster . These transmissions ha...
16 October 2025

Deep WALE (4G-ALE) Async call using PSK2

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(for background http://i56578-swl.blogspot.com/search/label/4G-ALE ) Very interesting example of an asynchronous three-way Deep WALE handsha...
29 August 2025

Link-22 12QAM waveform

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Fig. 1 - Link-22 transmission Recently my friend ANgazu from  radiofrecuencias.es sent me a great catch of a Link-22 transmission - Figure...