Unknown 236p16

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Unknown 236p16
Annotation 2020-03-02 214907.png
Frequencies 236.161 MHz
Frequency Range 236.161 MHz - 236.161 MHz
Mode NFM
Bandwidth 8 kHz
Location Guangzhou, China
Short Description
I/Q Raw Recording Download file
Audio Sample

There are multiple stations transmitting at the same time, their signals overlapping with each other. Each packet is of the same length. I suspect that this is some type of auto-reporting signal like weather stations or electricity meters, but haven't found any specifications that match with the frequency and modulation.