This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/osmocom-sdr@lists.osmocom.org/.
Sylvain Munaut 246tnt at gmail.comHi, > I am wonder what exactly the vertical axis shows? It is written Power(dB); if so, what is the reference power? Is it 1dBW? Generally it's dBFS ... i.e. relative to the full scale value you get from the SDR. Whatever that is is hardware dependent. > Moreover, by changing the PGA Gain, I will have different values of power (dB). What is the relation between PGA gain and the received power in dBm? If the SDR gain are correct, increasing the gain by 1 dB should raise the value by 1 dB. But most SDR gains are not calibrated and really not that precise on only bear a vague correlation between their nominal value and their actual values. > In general, does anyone know how should I find the received power in dBm, having the PGA gain(dB) and the value on vertical axis. (Picture in attach) You can't. The only way to do that would be for you to do a bunch of calibration measurement with your SDR at every gain level and across the temperature range and frequency range with known power sources. This is the exact reason why your Keysight/Tek/R&S/... spectrum analyzer costs a few order of magnitude more than your SDR ... they can do theses absolute measurement and the entire signal chain is done for that. Cheers, Sylvain