On Sat, Nov 30, 2013 at 5:00 AM, atools_cook <liwenpux...@gmail.com> wrote: > Hi Marcus, > > Thanks for your attention. > I have upload a bigger size image below. the x axis is sampling point which > reflects time and the y axis is margin which reflects the power. > I plot the image from the rx block of the gen2_reader project. The signal is > transmitted by the tx block of gen2_reader. > The to_complex block is use to trasfer the float data to complex data for > transmitting by tx block. > > The input data of gr_multiply_const_ff block are the same, they come from > the reader block. > It's weird that the output data of gr_multiply_const_ff are the same in > matlab image with different amplitude(bigger than 40 or not) but the signal > tx block transmiting are not. > > I can't figure out how the amplitude in gr_multiply_const_ff block influence > the signal in tx block without change the output data. > By the way, we use a gen2_monitor with another usrp to get signal > transmitted from the gen2_reader tx blcok, it has the same signal image to > the rx block of gen2_reader. So, we can assume that there is no problem with > our equipments > > Lee
Lee, You know that the UHD transmitter takes signal samples from 0 to 1? So after the multiply_const block, what's the value of the signal? If it's > 1, you're not going to get any change in the transmit power. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
