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Showing posts with label GA-205. Show all posts
Showing posts with label GA-205. Show all posts
17 August 2026

UK DHFCS 16289.5 kHz Follow-up: DRS GA-205 TDM Evidence and 1536-bit Frame Analysis

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Following up on the initial analysis of the UK Defence High Frequency Communications Service (DHFCS) transmissions on 16289.5 kHz [1] (obser...
12 June 2026

Simulating ADF ISB Transmissions: 12-Bit Repetition Coding on the USB Channel

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The idea for this post stems from an interesting RAN (Royal Australian Navy) fleet broadcast originating from the MHFCS (Modernised High Fre...
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...
1 comment:
20 February 2024

KW-46 secured fleet broadcast over S-4285 in ISB mode (Humpty Doo, MHFCS)

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Interesting fleet broadcast from the MHFCS (Modernised High Frequency Communications System) site in Humpty Doo, Northern Territory - Austra...
4 July 2019

110A 2400bps modem carrying 1536-bit protocol

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Signal recorded on 14600.0 KHz/USB tranks to the KiwiSDR  http://collie2.ddns.net:8073/ located in Western Australia.  The used HF wave...
28 May 2019

KW-46 secured fleet broadcast using the GA-205 multiplex (Australian RAN)

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This is a very interesting STANAG-4285 signal spotted on May 24 on 6378.0 KHz USB thanks to the KiwiSDR owned by VK6QS in Collie , We...
2 September 2018

DHFCS 1536-bit TDM protocol (2)

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In  the previous post I associated the 1536-bit TDM protocol to the DHFCS network, and that's correct, but I wrongly ascribed this pr...