Mysterious signal in low VHF band

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mysterious signal in low VHF band
Screenshot 2024-02-15 2144059.png
Frequencies 35 MHz,75 MHz
Frequency Range 35 MHz - 75 MHz
Mode NFM
Modulation
ACF
Bandwidth 20 kHz
Location Gulf sea
Short Description
I/Q Raw Recording
Audio Sample

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. recording https://drive.google.com/file/d/1pIu7I13fk3y4XNFNy6HsW_XfRnoq5spE/view?usp=drive_link