The K144XV's REF LOCK option uses phase-locking (via a PLL IC) to the 49.380-MHz reference (TXCO). This is extremely stable.
The KX3-2M module, when used with the KX3's extended temperature compensation, uses frequency locking (via firmware and a temp-sense IC). So it will "jump" in small increments, typically +/- 3 Hz. This may not be compatible with JT65, though I haven't tried it myself. Wayne N6KR On Apr 8, 2014, at 3:41 PM, Oliver Dröse <[email protected]> wrote: > > Hi Dave, > > for me the most important reason to buy the KX3 was the 2 m option, too. If > Wayne says the frequency will be stable +/- 3 Hz I think nobody will hear > that in CW/SSB, you will not even recognize, be it in a contest or while > working D4 on double hop ES on 2 m. ;-) Likewise with "normal" transverter > use on 10 GHz which we plan to do, too (if the LO is stable enough ... you > know there are 2 factors influencing things: freq stability of the KX3 itself > which the temp correction takes care of *and* LO stability in the KX3-2M > transverter itself). > > JT65 could be a different matter if the frequency will be corrected every > second or such. Even then it might be good enough. +/- 3 Hz is well within > the tolerance of JT65. What might be a problem is that JT65's tolerance is > for drifting signals, not "jumping" signals. So we will have to see how that > works. For comparison the frequency stabilization of the K3+K144XV with the > K144RFLK is using a comparable method and I do not have problems on JT65b. > But "comparable" is not "similar", of course, i.e. no temp curve correction > from memory but a real reference lock. Nevertheless the final effect seems to > be the same for me. Maybe Wayne can shine in on that point again. > > 73, Olli - DH8BQA ______________________________________________________________ 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]
