On Sun, Jun 22, 2008 at 02:42:03AM -0700, wolfgang buesser wrote: > > Hi, > > Iam using > gr.sig_source_s (self.usb_freq (), gr.GR_CONST_WAVE, 0, 0, 0) > to generate a carrier and > usrp.source_c(nchan=2,decim_rate=self.interp) to resample it at the same > frequency. > > I get what I expect: 2 complex numbers which are pretty constant. But with > every restart > of the program the phase changes (apparently by the same amount for both > channels). The > amplitude does not vary much from run to run. > > It seems to me, that the phase relation between the interpolator in the TX > and the decimator in > the RX changes with every restart. > > Is there a way to "reset" the interpolator/decimator so that I get the same > reading for every start > (as long as I don't change frequencies) ? > > Thank's > Wolfgang
This is the AD9862 digital-up-converter issue. IIRC it does come out of powerup in a constant state. I'm not sure that this will be useful, but if you never set the digital upconverter, the absolute phase will remain constant. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
