On Wed, Feb 1, 2012 at 11:11 PM, Ebtisam <ebtisamahme...@gmail.com> wrote:
> > Hi all, > > Im trying to transmit a sine wave from RFX2400 usrp, and im successful in > transmitting it. The only thing which bothers me is that im making a sine > wave from gr.vector_source_c in usrp_siggen.py with a sampling frequency of > 2M = dac rate/interp rate. So, how is this sampling done or sine is sampled > at some other frequency........ > > Regards, > Ebtisam > Ebtisam, I'm not sure I follow. You should be using a gr.sig_source_c to generate a sine way, not the vector source. The sig_source takes in the sampling rate in Hz and the frequency of the sine in Hz to produce the signal. Now, to the CPU, the sampling rate is a meaningless number; all it knows is the number of samples per cycle. But the rate matters when talking to the real world -- like the USRP itself. Since the USRP is set to a rate (dac_rate/interp_rate), it expects samples coming at that rate. It's the USRP that provides the rate clocking for the rest of the system. Tom
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