STANAG 4197

(16 x 75Bd + 39 x 44.44 Bd QPSK)

FFT-SPECTRA

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note the missing 393.75 Hz pilot-tone!

System used mostly for encrypted voice hooked up to a KY-99 / KY-99A / MINTERM device

 

• FFT-Spectrum versus time, frequency and signal intensity (complete burst):

 
 

• FFT-Spectrum versus time, frequency and signal intensity (start of burst):

 
 

• FFT-Spectrum versus frequency and signal intensity (4-tone + 3-tone preamble):

 
 

• FFT-Spectrum versus frequency and signal intensity (16-tone preamble):

 
 

• FFT-Spectrum versus frequency and signal intensity (39-tone mode):

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