On 23/05/2015 22:53, Alessandro Gorobey wrote: > Hi All, Hi Sandro, ... > In WSPR button "Read A and B from fcal.out" work and I obtain the > calibration. > The values inserted in WSJTX 1.6.1 also correct the frequency, but show > me a final 999 when the frequency is read from radio. > Selected 14076000 from list, radio goto 14.075.97(Hz unit missed on > radio) WSJTX show 14,075 999 > It is normal as FT857 is 10 Hz step and the calculation rounding cause this. As you imply there is only 10 Hz resolution on the FT-817/857/897(D) radios so the corrected frequency calculated is rounded to the nearest 10 Hz before being applied to the radio. Also when reading back from the radio a reverse frequency error correction is being applied to the radio dial frequency. The frequency read from the radio is effectively truncated so the round trip is not perfect due to rounding being applied one way and truncation the other.
The final adjusted frequency will be as close as possible to that required by the linear error correction. The value read back from the radio cannot be any more accurate than shown due to the resolution of the radio itself. Only if the correction factors are both zero or if there is zero slope correction and the intercept correction is an exact multiple of ten will the read back frequency be a mirror of the set frequency. ... 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
