On Tue, 2009-08-11 at 09:38 -0600, Jordan J Riggs wrote: > Here is the FFT output of the two devices.
This looks like gain compression or even clipping on the USRP2. The dynamic range of samples to be sent to the usrp.sink_c block for the USRP1 is +- 32767. The dynamic range of samples to be sent to the usrp2.sink_32fc block for the USRP2 is +-1.0. In either case, the RFX boards go into gain compression in the upper 20 dB or so of their transmit range, so if you have a modulation which requires linear frequency response (e.g., filtered BPSK), you need to restrict the sample amplitude to +- 3000 or so for USRP1 and += 0.1 or so for USRP2. If you are in fact sending the same actual sample range valid for the USRP1 (+-32767) into the USRP2 sink, you will of course get severe distortion as the sink will clip this to a +-1.0 square wave. Johnathan _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
