On 07/10/2014 07:27 PM, khalid.el-darymli wrote: > Hi, > > I am using the VCO block in GRC to generate complex-valued sweeps with > BW of 50 KHz and a sweep time of 1 second. The VCO is driven by the > sawtooth signal generator in GRC. > > The problem I am facing is that subsequent sweeps do not start at the > same time. Each new sweep seems to have a random phase shift relevant to > the other. Please see the attached figure which demonstrates the case > for seven subsequent sweeps. This figure was generated in Matlab after > saving the output of VCO to a binary file in GRC. Then, for the sampling > frequency of 50 KHz, individual sweeps were resolved and superimposed on > each other. > > My question is, how do I reset the phase of the VCO at the beginning of > each new sweep?
The block doesn't let you do that, and it probably shouldn't -- a "VCO" has, by definition, a continuous phase. If you want full control, you could use the phase_modulator block; but remember you need to calculate what the phase is for a sweep beforehand (you know integrate and that math stuff). M _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
