My unit has been on for just over a week. I captured the data overnight - the PPS TI plot is here https://drive.google.com/file/d/0B5tlecUITRBLMVV4NzFTMnlNaDA/. I see a similar PPS TI graph to yours, but my EFC is much different. Trouble is with that, I'm not sure what I'm looking at and what "normal" should look like!
I also snapped the Time Measures graph - https://drive.google.com/file/d/0B5tlecUITRBLdjdPRWpITGpmeDQ/. I don't yet have any other method of measuring ADEV, but what is captured here looks similar to many other ADEV charts. Again, any advice on what I should be looking for would be helpful. Anthony -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Friday, November 14, 2014 8:18 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lucent GPSDO comments Thanks everyone. My concern is did I need to reach out and get an exchange before the 30 days is up. I sense ASI the vendor is actually a pretty good company and will do the right thing. Regards Paul WB8TSL On Fri, Nov 14, 2014 at 7:35 AM, Bob Camp <kb...@n1k.org> wrote: > Hi > > > That OCXO is doing very well. > > If you look at the plot, it ??s doing a few LSB ??s on the DAC over > the time period. That ??s good performance. > > Bob > > > On Nov 13, 2014, at 9:17 PM, paul swed <paulsw...@gmail.com> wrote: > > > > Bob the actual pictures and files are large so here is the left > > screen > and > > right screen from the z3811 program. Pretty easy to guess whats in > > the middle. > > Lots of noise on the ti/pps and you can see EFC is rising all the time. > > I will say in the past it had been a steady rise now there is a wave > > that might mean its slowing down a bit. > > But this all looks rattier then I would believe. > > Regards > > Paul > > WB8TSL > > > > > > On Thu, Nov 13, 2014 at 5:43 PM, Bob Camp <kb...@n1k.org> wrote: > > > >> Hi > >> > >> How much is your unit moving? > >> > >> Bob > >> > >>> On Nov 13, 2014, at 1:50 PM, paul swed <paulsw...@gmail.com> wrote: > >>> > >>> On the older units that used a RB to control an Xtal. They created > >>> a > mix > >> of > >>> 5 Mhz +10 Mhz and that produced 15 out that hit an amplifier to > >>> drive a > >> 12 > >>> way splitter. > >>> I think I reverse engineered the circuit. Its on paper and filed. > >>> Oh > that > >>> ends this discussion. > >>> Anyhow it was not hard to figure out. > >>> I am still baking my Lucent in so want to see if it settles. > >>> There is just the barest of hints it may be. > >>> > >>> So do not want to power down to explore. Happy to dig in if I > >>> don't > have > >> to > >>> return the unit. > >>> > >>> Regards > >>> Paul > >>> WB8TSL > >>> > >>> On Wed, Nov 12, 2014 at 7:21 PM, Bob Camp <kb...@n1k.org> wrote: > >>> > >>>> Hi > >>>> > >>>> The chain in the Z3810 / 3811 / 3812 Lucent boxes is *much* > >>>> different > >> than > >>>> the setup in the earlier parts. The phase noise and ADEV on the > Z3810 ??s > >> is > >>>> better than what you got on the earlier versions. That makes > >>>> keeping > the > >>>> noise down in whatever mod you do more important. The existing 10 > >>>> MHz output on the Z3810 setup is a real good example of how a > >>>> seemingly > >> simple > >>>> thing can add a lot of phase noise and even mess up ADEV. > >>>> > >>>> I don ??t think the 15 MHz is used for much of anything in the Z3810. > That > >>>> could be wrong, but I can ??t see where it is needed based on > >>>> poking > >> around a > >>>> little. The 15 MHz buffer appears to be quiet and puts out a lot > >>>> of > >> power. > >>>> Using it for 10 MHz would give you a *lot* of 10 MHz signal to > >>>> play > >> with. > >>>> IF the mods are simple it ??s an attractive solution. If it > >>>> involves > >> swapping > >>>> out 30 parts - not so much. > >>>> > >>>> Bob > >>>> > >>>>> On Nov 12, 2014, at 5:50 PM, Perry Sandeen via time-nuts < > >>>> time-nuts@febo.com> wrote: > >>>>> > >>>>> Wrote: At some point we will get into hacking the main board to > >>>>> switch from 15 MHz to 10 MHz. > >>>>> > >>>>> One doesn ??t have to that if one uses the two IC divide by > >>>>> 1.5 circuit I offered the list. I specifically found it so I > >>>>> didn ??t > >> have > >>>> to > >>>>> hack the innards. > >>>>> > >>>>> Wrote: The great news is the oscillator is 5 Mhz. > >>>>> > >>>>> Don ??t bet the rent on that. My early units have 10 MHZ Datum > >>>>> oscillators. > >>>>> > >>>>> Bob ??s point about getting the GPSDO ??s if all cost the same > >>>>> is a good point. > >>>>> > >>>>> Another point. At least on the older units I have: GPSDO, > >>>>> Rubidium, and Crystal oscillator, the output circuitry after the > >>>>> 15 > MHz > >>>>> conversion takes place is the same. So if one hacks the 10 Mhz > >>>>> into > the > >>>> chain, > >>>>> all one has to do is remove or bypass the 15 MHz filter before > >>>>> the > >>>> output. > >>>>> > >>>>> Even if you don ??t have the rubidium unit but have either/or > >>>>> GPDO or Crystal oscillator email me off list for the rubidium > schematic > >>>> as > >>>>> after the logic chips they use the same circuit. > >>>>> > >>>>> Regards, > >>>>> > >>>>> Perrier > >>>>> _______________________________________________ > >>>>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go > >>>>> to > >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>>>> and follow the instructions there. > >>>> > >>>> _______________________________________________ > >>>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go > >>>> to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>>> and follow the instructions there. > >>>> > >>> _______________________________________________ > >>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > <lucent ti left screen.GIF><Lucent ti right > side.GIF>_______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.