Unknown signal between 424.000MHz and 425.000MHz

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Unknown signal between 424.000MHz and 425.000MHz
Frequencies 424.5125 MHz,424.6875 MHz,424.8 MHz
Frequency Range 424.5125 MHz - 424.8 MHz
Mode NFM
Bandwidth 15 Hz
Location Belgium
Short Description Unknown signal in Belgium between 424 and 425MHz. Permanent data stream.
I/Q Raw Recording
Audio Sample

Tetra band used by the bus company 'De Lijn'. Doesn't sound typical. Possibly MPT1327.

IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. link: https://mega.nz/#!Ps8yRRoC!7gUEhd_Y8Pv_5GxfkRV8YgeAMocYm9muxxYlJ2X1nu0   [dead link]