Hi Jim, You might want to run the temperature compensation procedure on your KX3. If it's performed correctly, you should see < 2 Hz drift over the temperature range. You may want to purchase the XG50, used as a stable frequency referece, or you can supply your own.
The procedure is shown in this document: http://www.elecraft.com/manual/KX3%20Custom%20VFO%20TC%20rev%20A9.pdf 73, matt W6NIA On Wed, 27 Mar 2013 18:43:01 -0400, you wrote: >I have a K2 that I have been using for almost a year on JT65. No >problems whatsoever. I obtained WAS and eWAS in about 4 months of casual >operating. > >A few months ago I got a KX3 and for the last few days have been trying >it out on JT9. I haven't been able to make a single contact. I would >call CQ and see someone answer me on the same frequency but WSJT-X >wouldn't produce a decode. I could answer a CQ and see a reply but again >no decode. (I was running 5 watts.) > >This afternoon I noticed something unusual. After a 1-minute >transmission all of the received signals during the next minute had a >skew (drift) and none decoded. The drift was for a total of about minus >ten Hertz during the minute after the transmission. If I didn't transmit >during the next one-minute cycle there was little drift and the received >signals would decode. > >I began to speculate that during the one minute transmission some >temperature-sensitive component(s) heated up and caused a change in >frequency. During the next minute they cooled and the frequency returned >to normal. I played with this for a little while and the results were >consistent. In the minute following a transmission there were no decodes >but during all subsequent minutes signals would decode. > >I switched back to the K2 and had five normal JT9 contacts, the nicest >of which was John, ZD7JC on St. Helena Island in the South Atlantic. All >this with a low dipole and 10 W. (He gave me a signal report of +00 >which meant that I could have been using one watt or less.) > >I assembled the KX3 and believe that I ran all the tests and >adjustments. Any suggestions as to what I can do to tame this >temperature sensitivity? > >73, > >Jim - W4BQP >K2 #2268, KX3 #2875 > >______________________________________________________________ >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 ______________________________________________________________ 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
