[Discuss-gnuradio] unknown phase-relation between rx and tx

[wolfgang buesser]

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
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