Continuously signal on 424.493Mhz

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Unknow continuously signal on 424.493Mhz
SDR-Sharp-Screen-Grab-22325601012021 (2).jpg
Frequencies 424 MHz
Frequency Range 424 MHz - 424 MHz
Mode Nfm
Modulation FSK
Bandwidth 10 kHz
Location Belgium Antwerpen
Short Description continuous signal on 2 different frequencies : 424.493Mhz and 424.793Mhz <-(on this frequency is the sound just a little slower) i think it has something to do with the public buscompany
I/Q Raw Recording
Audio Sample