>It would be interesting if someone with an EXTREF board installed would >post the change in REF CAL number from cold to hot and extended run.
For K3 #24, w/EXTREF: Cold start: 49.379.774 is typical; After ~2 hours warmiing up: 49.379.693 is typical. The EXTREF here is driven by a Trimble Thunderbolt-based GPSDO. 73, matt W6NIA == > >I used to drive the local Intelsat Std. B earth station and our uplinks >at 6GHz were locked to an approximately 4MHz precision TCXO which locked >a 100MHz osc, which locked the final SHF osc. It was not unusual to see >a couple of Hz/month wander (at 4MHz). > >Not done like that in the new station. Neither does it have two stage >parametric RX preamps that need de-icing twice a year at the feed >assembly, but that is another story. > >Regards, > >Mike VP8NO > >On 29/04/2012 06:06, Oliver Dröse wrote: >> Aging of components? >> >> Vy 73, Olli - DH8BQA >> http://www.dh8bqa.de/ >> >> >> >> ----- Original Message ----- >> From: "w0ih"<mfros...@msn.com> >> To:<elecraft@mailman.qth.net> >> Sent: Sunday, April 29, 2012 4:52 AM >> Subject: [Elecraft] K3 Frequency Shift >> >> >>> A couple weeks ago, I was on 40 meters with a group of friends, and one of >>> the guys (likes everyone on frequency ;-) suggested that I was off. >>> >>> I finally got around to checking the K3 last week and found that it was >>> off >>> by about 260 Hz from what it should have been. I rechecked the >>> calibration >>> (against WWV, per the manual instructions) and the reference oscillator >>> had >>> not changed from the original setting (I had it marked down in the manual >>> from when I first calibrated it). I had to move it by 260 Hz to get it to >>> zero beat WWV. >>> >>> Anyone have any idea why it should shift frequency? I can't say that I'm >>> terribly concerned, more curious about it. >>> >>> Mike >>> >> >> ______________________________________________________________ >> 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 >> >______________________________________________________________ >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 ______________________________________________________________ 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
