The local oscillator design of the KX2 is very different from the KX3, as are the thermal isolation of the oscillator from the PA and the high current paths in the radio. There is as yet no field temperature compensation procedure available for the KX2 nor is it clear that one is needed. At least one KX2 field tester operated JT65 successfully with the KX2.
There are enough KX2 radios in the field now that it should be a simple matter for an owner to measure the stability of the radio in this mode and report the results to the group to satisfy the curious... 73, Lyle KK7P (on "vacation") Sent from my iPhone > On May 29, 2016, at 8:14 PM, Dan - VA3MA <[email protected]> wrote: > > Luke > Thanks - just what I needed to know! > Have you tried JT9 ? > Perhaps some sort of heatsink/handles added to the case might help?? > 73 > Dan VA3MA > > > On 2016-05-29, at 22:37, Luke <[email protected]> wrote: > > Hmm, not sure why it cut out my message. Here's what I wrote: > > I've used my KX2 on WSPR and JT65 and it appears to be plenty stable. I used > to have a KX3 and sold it because it wouldn't decode WSPR between transmit > cycles due to excessive drift. I've kept the KX2 to <5 watts because the > right sideplate gets very hot with the high duty cycle. > > I've actually just been sitting here running JT65 @ 10 watts when I got your > email, and it is doing pretty well. I had 3 back to back QSO's and on the > last transmission the PA Temp got up to 47C (~117F) which doesn't seem too > bad. As it cools off there is no drifting or slanting of signals on the > waterfall either. I think the 1 minute on/off duty cycle of JT65 is very > doable with the KX2, and WSPR might be pushing it. The other night the > sideplate got quite hot running WSPR at 5 watts. > > Luke > AD0KI > > > From: Dan - VA3MA <[email protected]> > To: Luke <[email protected]> > Sent: Sunday, May 29, 2016 8:12 PM > Subject: Re: [Elecraft] KX2 on JT65 & JT9 ?? > > Luke > No content???? > >> On May 29, 2016, at 8:51 PM, Luke via Elecraft <[email protected]> >> wrote: >> >> >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]
