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STANAG-4415, a NATO specific 188-110 75 bps waveform

The waveform of STANAG-4415 is the same as the 75 bps waveform of 188-110 (MS-110), but the requirements of receiver performance in STANAG-4415 are stricter than those of MS-110 (the mode is referred...

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CIS-Navy & Akula transmission

My friend Mario often monitors the frequency of 9201.0 KHz/USB in search of "Akula" signals: he mainly uses a KiwiSDR receiver located in Japan (Azumino-city, Nagano) [1] and it seems that this...

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Norwegian Navy STANAG 4481-PSK Serial Tone Mode

STANAG 4481 defines the minimum technical standards for Naval shore-to-ship broadcast HF communication. The standard describes three data modem variants, namely the S4481-PSK Serial Tone Mode (STM)...

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IPSec (ESP) over HF using STANAG-5066

For a few days I have been monitoring the 20.5 MHz/USB frequency, thanks to the KiwiSDR owned by IZ6BYY [1], recording some transmissions such as the sample in Figure 1, by the way such transmissions...

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PSK4 2400 Bd waveform, likelyThales HDR Single Tone modem

Edited A few days ago my friend linkz sent me an interesting recording of a signal spotted on 11166.0 KHz/USB, in addition to the recording he also sent me an excellent "direction finding" work that -...

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Japanese Navy fleet broadcast, a review of the "Japanese Slot Machine" (I)

Japanese Maritime Self-Defence Forces (JMSDF) HF Fleet Broadcast, also known as the "Japanese Slot Machine", heard with data payloads on 8312.50 KHz/USB using a remote KiwiSDR located in Azumino-city,...

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