I am not arguing about that calculation Joe, it's proof that you don't need GPSDO accuracy as if will be several orders of magnitude better than that.
73 from David GM4JJJ > On 11 Mar 2016, at 18:25, Joe Subich, W4TV <li...@subich.com> wrote: > > > > While locked to the external source, the K3’s reference > > oscillator frequency is maintained within 2 Hz. > > The K3's reference oscillator is 49.380 MHz (+/-) not 10 MHz. > > The K3EXTREF uses the external 10 MHz signal to gate a counter > which counts the reference. That count is then used to adjust > the reference frequency. Maintaining the 49.380 MHz reference > +/- 2Hz is on the order > of 0.04 ppm. > > 73, > > ... Joe, W4TV > > >> On 3/11/2016 1:07 PM, David Anderson wrote: >> Dick, >> >> I found the reference to that figure I quoted, it is in the K3EXREF >> manual: >> >> The K3EXREF option locks the K3's reference oscillator frequency to >> an external 10 MHz source by automatically controlling the REF CAL >> function. While locked to the external source, the K3’s reference >> oscillator frequency is maintained within 2 Hz. Since the K3EXREF >> does not phase lock the K3’s reference oscillator, the external 10 >> MHz source has no impact on the K3’s phase noise performance. For >> best performance we recommend your K3 be equipped with the KTCXO3-1 >> high stability (0.5 ppm typ.) reference oscillator. >> >> >> 73 from David GM4JJJ >> >>> On 11 Mar 2016, at 16:55, Richard W. Solomon <w1...@earthlink.net> >>> wrote: >>> >>> I am a tad confused over this issue. Perhaps I need to read up on >>> how Elecraft controls frequency. >>> >>> My understanding on a "Locked" frequency would infer that the >>> result would be a LOT closer than 2 Hz @ 10 MHz. >>> >>> Is there a detailed description of the process somewhere that I >>> could read ? >>> >>> 73, Dick, W1KSZ >> ______________________________________________________________ >> Elecraft mailing list Home: >> http://mailman.qth.net/mailman/listinfo/elecraft Help: >> http://mailman.qth.net/mmfaq.htm Post: >> mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net Please help support this >> email list: http://www.qsl.net/donate.html Message delivered to >> li...@subich.com > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to gm4...@yahoo.co.uk ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
