Thank you very much Josh but i have another question for more please
> What frequency did you tune the basic RX? Perhaps you are seeing an > offset between signal generator and DDC. Do the tones the FFT sink look > to be in the correct positions? Did you mean the tune frequency in the basic Rx same with the frequency that i can set in the usrp source block ? So if the same i set the frequency in the usrp source block(from my understand is nco frequency ) equal 1.5Mhz and the tones of the FFT sink seem like the product of the multiplication of the input signal(1.5Mhz) and nco signal(1.5Mhz) and showed only the input signal - nco signal ' s frequency response and i think it's correct. and i have another question that is the signal that come from usrp source that show in the scope sink show the I and Q signal but if i connect the usrp source with the FFT sink it's show the frequncy response only one graph So i'm not sure what was the FFT sink show(I and Q , just I or Q only , or I +Q ) thank you very much for yours advice > Date: Sun, 8 Aug 2010 23:21:42 -0700 > From: j...@joshknows.com > To: discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] USRP problem ? used for Digital beacon > receiver > > > > 1. How do everybody set MUX? I tried to read the datasheet but It > > wasn't make sense for me.So what I do is use the GRC and used the Usrp > > block so i know that my db BasicRx is on side B RXA and My WBX is on > > Side A Rx2 but if i want to set mux in the python program how do i do? > > > > This is the code for the grc usrp* blocks: > You can see how its set in <gnuradio_repo>/grc/grc_gnuradio/usrp/*.py > > > > > 2. I tried to find the signal's phase,so i generated the signal > > about 1.5M from signal generator (just for test) directly to the Basic > > Rx Db. So what i expect is the IQ signal that show in the GRC Scope sink > > would be the constant(cosphi and sinphi) signal but It's not ,the > > signal seem to be like the cycle(period). What do I misunderstanding? > > > > What frequency did you tune the basic RX? Perhaps you are seeing an > offset between signal generator and DDC. Do the tones the FFT sink look > to be in the correct positions? > > -Josh > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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