As Martin said, it really helps to have a spectrum analyzer. What I'll do is generate a CW tone (sinusoid) of 0.707 Vp; that is 3 dB backed off from DAC full scale power. Then I'll increase the TX gain setting until the TX image rejection starts to become poor. This will typically be 15 dBm for low frequencies (< 500 MHz), and will increase with frequency. These settings would be the maximum you want to transmit. If linearity is a concern, you'll want to do the same but generate two tones at 0.35 Vp and look at the intermod levels, then back off TX gain to maybe -30 dBc intermod.
Once you have that max level set, it really depends on the statistics of you signal; peak-average ratio or CCDF (see link). If you stay 3 dB backed off from both DAC full scale and TX chain P1dB, you should be OK for most signals unless you are doing OFDM or other multi-carrier stuff. http://www.emce.tuwien.ac.at/hfadmin/354059/download/Characterizing_Digitally_Modulated_Signals_width_CCDF_Curves__Agilent_Application_Note_5968-6875E_.pdf Lou KD4HSO Simone Ciccia S210664 wrote > - UHD USRP SINK block (in gnuradio) allows to set the tx_gain(dB) > > Which is the relation between these parameters??? > If I want to set a specific transmitted power??? -- View this message in context: http://gnuradio.4.n7.nabble.com/TX-POWER-USRP-N210-AND-WBX-DOUGHTERBOARD-tp49481p49489.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
