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xmikos / qspectrumanalyzer

Spectrum analyzer for multiple SDR platforms (PyQtGraph based GUI for soapy_power, hackrf_sweep, rtl_power, rx_power and other backends)
GNU General Public License v3.0
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hackrf_sweep signal jumping downwards #69

Open jamesshao8 opened 5 years ago

jamesshao8 commented 5 years ago

Hello,

I am using hackrf_sweep to watch the spectrum. Most of the time, the signals would show upwards from the noise floor, but sometimes the signals are jumping downwards.

Is it because hackrf_sweep is showing negative value of complex fft result? Should we do an abs operation before plotting to the spectrum?

Thanks, Shao