[time-nuts] Lucent GPSDO comments

[paul swed]

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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