[time-nuts] Lucent GPSDO comments

Sat Nov 15 01:14:58 UTC 2014

Anthony
Had a chance to compare my image with yours and the blue behaviors the same
as far as peak to peak goes. Yours however has far fewer jumps then mine.
You EFC has various jumps but is fairly constant while mine as Bob and
others have said is baking in. I am feeling better about my Lucent.
The ADEV plots are similar to what you sent.

Just fired up the ole Z3801 for comparison graphs. Should be interesting.
Regards
Paul
WB8TSL

On Fri, Nov 14, 2014 at 9:38 AM, Anthony Roby <aroby at antamy.com> wrote:

> 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-bounces at 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 <kb8tq at 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 <paulswedb at 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 <kb8tq at n1k.org> wrote:
> > >
> > >> Hi
> > >>
> > >> How much is your unit moving?
> > >>
> > >> Bob
> > >>
> > >>> On Nov 13, 2014, at 1:50 PM, paul swed <paulswedb at 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 <kb8tq at 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 at 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
> > >>>>> _______________________________________________
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> > > <lucent ti left screen.GIF><Lucent ti right
> > side.GIF>_______________________________________________
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