Hi Marcus, May i ask you how you calculate the freq error i.e. 12.5 ppm ? Is there a formula?
Mehmet. 2011/5/11, Marcus D. Leech <[email protected]>: > On 05/11/2011 07:57 AM, Tom Rondeau wrote: >> >> >> Mehmet, >> You are seeing the frequency drift of the oscillator in both the >> transmitter and receiver. They will never be perfectly accurate. You >> should probably test your block using a simulation setup. That is, tie >> the transmitted signal straight to the receiver in GRC and bypass the >> USRPs altogether to make sure your block is correct. >> >> If you are looking for a symmetrical signal, you could then use your >> calculation as the error value in a control loop to correct your >> frequency offset :) >> >> Tom > With the range of observed values given by Mehmet, it looks like a total > frequency error of about 12.5PPM, which is pretty darned good. > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
