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
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