Don, Thanks for setting clearing this up for me. Very helpful.
Regards, Tony On Wed, Aug 13, 2014 at 8:04 AM, Don Wilhelm <[email protected]> wrote: > Frequency stability is normally expressed in terms of ppm over a specific > temperature range. > For the KX3 it is +/- 1 ppm over 0 to 50 degC. > > I believe the statements below confuse tuning frequency calibration > inaccuracy with stability - one has nothing to do with the other. > Problems with the KX3 being consistently off frequency can normally be > resolved by doing the Reference Frequency Calibration (see the Caalibration > section of the manual). > > 73, > Don W3FPR > > > On 8/12/2014 3:14 PM, tcollen wrote: > >> Hi Jerry, >> >> My TS-590 exhibits almost a similar situation, without the SO-3 >> high-stability oscillator installed. The specs say the 590's frequency >> stability is within +- 5ppm, and I've found the higher in frequency I go, >> the further up I need to tune to zero-beat a station. On 20m, I've found I >> have to consistently tune up a bit to center. >> >> Doing the math, it looks like your KX3 is at least consistently off by 25 >> or >> 26 ppm: >> >> 133 / 5.0 = 26.6 ppm >> 190 / 7.335 = 25.9 ppm >> 250 / 10.0 = 25 ppm >> 384 / 15.0 = 25.6 ppm >> >> 25-26 ppm definitely adds up, and it seems to me the unit is >> mis-calibrated, >> but I don't know what the KX3's tolerance for frequency stability is. >> I'm a >> new KX3 owner myself so I haven't had enough experience with it to figure >> out if my unit is off by a small bit or not. >> >> Does the behavior change when the unit has been off for a while, vs when >> it >> warms up? >> >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
