There's no calibration in such SDR devices. The dB values you see in a GUI are "dB relative to full scale" (and "full scale" is typically 1.0), often with some normalization due to how the DFT was calculated. These values are (idealizing) *proportional* to the power in dBm, but they are *not* the same. The proportionality factor is result of the signal processing chain and will be different for different programs.
Please don't use Nabble. It breaks discussions!!! It is a **bad** frontend to the mailing list. Sign up directly with your email address on https://lists.gnu.org/mailman/listinfo/discuss-gnuradio , please. I will not react to further messages sent through Nabble. Best regards, Marcus On 20.06.2017 16:10, GNUBeginner wrote: > Dear Marcus, > > If I may, I would like to ask for your guidance please. I have been > experimenting with gr-scan via command line and QSpectrumAnalyzer GUI. > > After injecting -15 dBm signal with 20 dB attenuator at 2412 MHz WiFi > channel to the HackRF One, somehow I am seeing -53 dB peak power with > gr-scan and -51 dB peak power with QSpectrumAnalyzer GUI. > > I am not sure what these values are. This has to be a calibration issue. > Could you please help me understand what these values are? > > Thanks > > > > > -- > View this message in context: > http://gnuradio.4.n7.nabble.com/wrong-dB-tp27194p64311.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
