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19792Re: [SDR#] Using SDR# as spectrum analyzer

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  • Shirley Márquez Dúlcey
    12 Mar

      Still not sure what the notation 'dBFS' means when looking at the peaks on the screen.

      Any input would be helpful.


      dBFS means dB referenced to the full scale reading of SDR#. Full scale is 0dB, so any received signal will have a negative value relative to that. What the minimum reading is will vary depending on what receiving hardware you are using; on an RTL-SDR stick it's likely to be somewhere in the neighborhood of -60dBFS, whereas if you're using a Softrock with a high quality sound card on a very quiet band it may be as low as -120dBFS; that won't even be visible with the default range setting.

       

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