Hi Bill, Il 24/05/2015 01:03, Bill Somerville ha scritto: > On 23/05/2015 22:53, Alessandro Gorobey wrote: >> Hi All, > Hi Sandro, >> I obtain all files needed and also a fcal.plt usable with gnuplot. >> fcal.out contain: >> 0.0383 >> -2.0686 >> The values depend on radio hardware project and precision of calibration. >> "A" value near to zero is realistic. >> The "B" value is the ppm error and in my case is negative, 2 Hz every MHz. > I believe that with a radio design using a DDS synthesiser and a single > reference oscillator there should be no intercept error component > assuming the radio firmware has no defects. The only "static" error > contribution will be from reference oscillator calibration and that only > contributes a potential slope error. I agree, the offset can be caused by ADC of audio board. It seem a realistic 38.3 milliherz error.
73 Sandro IW3RAB > > ... > > 73 > Bill > G4WJS. > > ------------------------------------------------------------------------------ > One dashboard for servers and applications across Physical-Virtual-Cloud > Widest out-of-the-box monitoring support with 50+ applications > Performance metrics, stats and reports that give you Actionable Insights > Deep dive visibility with transaction tracing using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > _______________________________________________ > wsjt-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
