Unknown trunking or data

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Unknown trunking or data
133187500 strangetrunking.png
Frequencies 131.1875 MHzMegaHertz (MHz) 10^6 Hz131,187,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
131,187.5 kHzKiloHertz (kHz) 10^3 Hz
Frequency Range 131187500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).131,187.5 kHzKiloHertz (kHz) 10^3 Hz
131.188 MHzMegaHertz (MHz) 10^6 Hz
131187500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).131,187.5 kHzKiloHertz (kHz) 10^3 Hz
131.188 MHzMegaHertz (MHz) 10^6 Hz
Mode NFMNarrowband Frequency Modulation
Modulation
Bandwidth 12.5 kHzKiloHertz (kHz) 10^3 Hz12,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0125 MHzMegaHertz (MHz) 10^6 Hz
12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
Location UK
Short Description Unidentified data signal, possibly trunking
I/Q Raw Recording
Audio Sample

Description[edit]

Unidentified data signal, possibly trunking or possibly APT(Automatic Picture Transmission) from a NOAA satellite.

Analysing the NBFM-demodulated signal from a discriminator tap suggests that the modulation is FFSKFast Frequency-Shift Keying, using 1800Hz and 2400Hz tones, possibly similar to MPT1327.