Hi Brian, I believe I am seeing the same thinghere... I used to use a program called Dopplergram. Dopplergram graphs audio vs time, and is used to look for very, very, small changes in frequency. By small, I mean on the order you are describing... A few tenths of hz.
In the past, I used it to watch Ionospheric movement changes, via Doppler changes. Using the old and the new synth, (actually using the K3 at all), makes this now seems impossible, and I have given up on it. I have mentioned it here a few times, and there seems to be no resolution. I asked if the external reference wold correct this, and the consensus was-- no it would not. Sorry to say, this appears to be one case where the K3 seems to totally fail at the task. The sawtooth steps as the K3 corrects for drift, (or whatever it is doing), destroy the look of my ionospheric Doppler graphs. I will probably just get a different rig, and use it for Dopplergrams, while keeping the K3 for normal use. If you ever do figure out a fix for this, PLEASE let me know. -- 73's, and thanks, Dave (NK7Z) For software/hardware reviews see: http://www.nk7z.net For MixW support see: https://groups.yahoo.com/neo/groups/mixw/info For SSTV help see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Sat, 2016-03-05 at 13:43 +0000, brian wrote: > Guys, > > I wonder if anybody else noticed this. I'm wondering if there is an > explanation. > > Picked up a high S/N K3 which has new syntheizers installed. It > also > has the TCXO installed. No ref lock board. > > Looked at the pitch vs time from a Rb locked signal generator at 10 > MHz. > > I see sawtooth variations in pitch of about 0.15 Hz peak-to-peak > with > periods of about 30-45 seconds. > > Anybody else notice this? > > These variations do not show up when the identical experiment is > performed using a TS-480 with high stability oscillator. Rather all > variations are smooth. They did not show up on an older K3 with the > old > synthesizer boards. > > Yes the variations are small but the discontinuous nature is of some > concern. > > 73 de Brian/K3KO > ______________________________________________________________ > 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]
