Just about everybody on this list has extensive experience on GPSDO. Once it
gets going, OCXOs are very reliable. I haven't had one fail, yet. There are
plenty available on eBay, too, and if one is not too critical, anything will do
for general lab use.
If this is your first time, my
Hi
A number of us have Trimble TBolt’s that have been running for over 10 years.
The early HP’s (Z3801 … ) seem to have a weakness in the power supply section.
So far mine have come back to life after simple repairs. That puts the into the
20+
year range. The “Nortel” GPSDO’s seem to just keep
Anyone have any experience with any of the GPS Disciplined. Reliability?
Etc.
Symmetricom 10 MHz TTL/Sine OXCO sources offered on ebay? Usually in $150 to
$300 range.
Not ready to sink $500 or more into a rubidium source.
Seth L Taylor
Francine S Taylor
6585 Kensington Ln
Apt 401
Hi
> On Sep 4, 2020, at 3:37 PM, Matthias Welwarsky wrote:
>
> Dan,
>
> I've attached the last 25000 seconds of data. The drift was about 15 DAC
> units
> during this time. It's a 16 bit DAC, the pulling range is about 10Hz, so LSB
> is worth 1.5e-4 Hz. 15 DAC units are 2.3e-3 Hz over
Hi Bob,
On Freitag, 4. September 2020 15:03:26 CEST Bob kb8tq wrote:
> Hi
>
> Best guess is that the oven circuit has “issues”. If that’s the case, it
> will go on pretty much forever and ever. Without a plot, it’s sort of hard
> to guess ….
Unfortunately, I don't have a longer history on
Hi. Over the last few weeks I have slowly been getting back into the time nuts
game..
A few days ago I slightly adjusted the frequency of my FTS1050 (after running
un disturbed for many years it was off frequency by approx 7E-10 which is not
to bad in my view but I would like it to be a
Hi
….. ummm …. e …..
> On Sep 4, 2020, at 2:04 PM, rfnuts wrote:
>
> Hi,
>
> given it is a 10MHz OCXO, your drift is just 4E-11/hour or 9.6E-10/day, which
> isn't terribly bad, is it?
>
> A good modern OCXO is specified at +/- 0.2ppb/day (2E-10) after 30 days of
> continuous operation.
Matthias Welwarsky said:
> Could this be OCXO retrace? How long can that phase last? I'm trying to
> decide if I should give it another week or just scrap it and move on.
The one sample I played with was a 3 MHz OCXO without any attempts to lock it
to anything. The drift or retrace was
Hi,
given it is a 10MHz OCXO, your drift is just 4E-11/hour or 9.6E-10/day,
which isn't terribly bad, is it?
A good modern OCXO is specified at +/- 0.2ppb/day (2E-10) after 30 days
of continuous operation. Some ultra high performance stuff does
<1E-10/day, and may improve down into the
Matthias,
How about a 'quick and dirty, hand wavey' graph?
This is a known 'kinda good' OCXO, that was off for about a year. The
DAC values are just that, DAC counts. The black line should represent
about 8e-12 per day drift. (Sorry, I don't have better numbers than that
easily on hand). I
Hi
Best guess is that the oven circuit has “issues”. If that’s the case, it will
go on pretty much forever and ever. Without a plot, it’s sort of hard to
guess ….
Bob
> On Sep 4, 2020, at 2:50 AM, Matthias Welwarsky wrote:
>
> Hi,
>
> I mentioned in a previous email that I seem to have
Hi,
I mentioned in a previous email that I seem to have picked a particularly bad
(broken?) OCXO for GPSDO testing. It drifts at a very high rate, from the DAC
graph I calculate it is around -4e-4 Hz/hour. It's been on for about 1 week
now and the drift doesn't seem to come down, or maybe just
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