STANAG 4197

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STANAG 4197
STANAG 4197.jpg
Frequencies 3 MHz,30 MHz
Frequency Range 3 MHz - 30 MHz
Mode USB
Modulation PSK,OFDM
ACF
Bandwidth 2.3 kHz
Location Worldwide
Short Description STANAG 4197 is a NATO QPSK OFDM signal used in ANDVT modems that transmit encrypted digital voice over HF.
I/Q Raw Recording
Audio Sample

STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4197 is a NATONorth Atlantic Treaty Organization QPSKQuadrature Phase-Shift Keying (2 bits per symbol) OFDMOrthogonal Frequency-Division Multiplexing signal used in Advanced Narrowband Digital Voice Terminal (ANDVT or AN/DVT)modems that transmit encrypted digital voice over HFHigh Frequency (3-30 MHz). These modems include the ANDVT MINTERM KY-99A modem.

STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4197 is defined as "Modulation and coding characteristics that must be common to assure interoperability of 2400 bpsBits per second (bps) linear predictive encoded digital speech transmitted over HFHigh Frequency (3-30 MHz) radio facilities". This signal utilizes similar waveforms to the MIL-STD-188-110A/B Appendix B waveform but this does not utilize the 393.75 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). pilot tone, and has a unique preamble that differs from the App. B waveform.

The preamble starts similarly to how 110A/B App. B 39-Tone OFDMOrthogonal Frequency-Division Multiplexing starts, but the signal begins with a 16 tone data header before going into the 39 tone data payload. This signal is predominantly used for digital voice, so encrypted digital voice will be the payload in the 39 tone segment.


Decoding Software[edit]

Professional Equipment/Software
  • Wavecom W-Code
  • Wavecom W-Spectra


Video Examples[edit]


Additional Links[edit]

Additional Images[edit]