Though I'm sure you want to be sure the XG-50 is working well, I second Phil's recommendation to use your Trimble Thunderbolt as your frequency source. Worked fine for me, there was a very strong 5th harmonic at 50 mHz, even after inserting an inline attenuator.
Chip AE5KA On Thu, May 22, 2014 at 12:56 PM, David Anderson <gm4...@yahoo.co.uk> wrote: > It could be the low level of the XG50 is not enough to trigger the counter > properly. I think I found a similar problem and had to use a scope probe on > the counter and put it before the output attenuator on the XG50. > > 73 > > David Anderson GM4JJJ > > > On 22 May 2014, at 15:31, <kj...@kj7rt.com> wrote: > > > > I am trying to use my XG50 to run the Extended Temperature Compensation > > Procedure on my KX3. This is the first time I have attempted to use the > > XG50 since building it. I have completed the 8 hour burn-in. > > > > When I first connect the XG-50 to my HP frequency counter, I get a > > reading of something like 49.379990. Then after running for several > > minutes it starts dropping in frequency to something more like > > 49.32xxxx. It is still wildly fluctuating. If I connect the 10MHz output > > of my Trimble Thunderbolt GPSDO to the counter it stays quite stable > > just below 10 MHz. > > > > I re-soldered all the XG50 components and tried with both a metered > > home-brew power supply and a 12v SLA battery with the same result > > although re-soldering made a significant but not permanent improvement. > > > > My lab is in my photographic darkroom which has an ambient temperature > > of about 68 degrees F and the AC does blow across the work area. > > > > > > Thanks, > > > > Gary Marklund > > KJ7RT > > Sun City, AZ > > USA > > > > ______________________________________________________________ > > 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 > > Message delivered to gm4...@yahoo.co.uk > ______________________________________________________________ > 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 > Message delivered to lightdazz...@gmail.com > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
