The process is simple: You use exactly the settings you want to use later, send a signal of known digital power (i.e. known |x|²), measure the output power with a spectrum analyzer. You take e.g. half that digital power, measure again, to verify you're in the linear region.
If you are in the linear region, the ratio between your |x|² and your measured power is your calibration factor. Be aware that you need to know how to deal with your spectrum analyzer; we can't tell you what's the right window, window bandwidth, sweep step width etc for your application. Best regards, Marcus On Wed, 2018-04-25 at 12:15 +0530, Prabhat Kumar Rai wrote: > Dear Marcus & Vitt, > > Thanks for your suggestion. > As I am new in this field I don't know how to calibrate spectrum > analyser with usrp. Is there any video tutorial or any website link > you can provide will be helpful? I have searched on internet but > didn't get a thing for calibration. > > Suggestion from other members is also welcome. > > Regards > Prabhat > > On Tue, Apr 24, 2018 at 3:03 PM, Müller, Marcus (CEL) <[email protected]> wrote: > > You'll have to calibrate that yourself. There's no fixed formula for > > all possible individual devices, and all possible signals (with all > > possible PAPRs, which is especially relevant for OFDM). > > > > Best regards, > > Marcus > > > > On Tue, 2018-04-24 at 13:05 +0530, Prabhat Kumar Rai wrote: > > > Hello, > > > > > > I am using tx_ofdm.grc file to transmit a signal via USRP B210. I am > > > fixing my system as center_freq 1.8GHz, BW 20MHz, Sample rate 1.92M, > > > Gain 20 dB, when I am checking the gain in the spectrum analyser it > > > comes out to be -77dBm, I know that channel is giving me around 30 dBm > > > attenuation still I am unable to compute the actual transmit power of > > > usrp. > > > I know that only way to know transmit power is using the combination > > > of frequencies, sampling rates, master clock rates, analog bandwidths > > > and gain but don't know how and where to use them, all of them are > > > already in a usrp_sink block. > > > > > > Is there any other way to compute actual transmit power of Usrp or any > > > other formulae??? > > > > > > > > > I have to use that power for RSSI calculation. > > > > > > > > > Regards, > > > Prabhat > > > > > > _______________________________________________ > > > Discuss-gnuradio mailing list > > > [email protected] > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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