[time-nuts] Trimble "UCCM" GPSDO adevs

[Mark Sims]

Yes,  if your TICC reference oscillator is of lowish quality you should run the 
TICC in time interval mode and it can analyze one device.   

To analyze/compare two devices with one TICC you really need a very high 
quality reference oscillator...  

 I have a couple of FTS oscillators that have short term ADEVs in the 3E-13 
range.  I'll probably build my adev box using one of those as the TICC 
reference.  You can generate meaningful relative comparisons between two 
devices with a not-quite-so-good oscillator, but the shorter tau numbers will 
not be very accurate.
  
For now, i"m just playing around to see what can be done.  BTW, if I remember 
correctly the ERC-130 rubidium has an M100 type rubidium in it and not an LPRO. 
 The LPRO is in my UCT 2008 box.   

The UCT 2008 has 1PPS/1/2/5/10/MHz TTL  outputs along with 10 x 10 Mhz sine 
wave outputs...  and a beefy, but dead dead power supply (replacement ordered) 
with enough spare 5V capacity to run the PI.   It also has a lot of empty space 
in it where one could mount a TICC and support circuitry.  If I move the power 
input plug  and replace the back panel I can mount the PI screen in the box.

---

>  If you're comparing a pair of decent sources, results at measurement tau 
of less than at least several hundred seconds are likely showing counter 
jitter, not real performance.  It's important always to keep that in mind.
___
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.

Re: [time-nuts] Coming to a drive-way near you: Optical Lattice clocks

[Tim Shoppa]

Well, I learned a new phrase. I can't wail until the
chronometric-leveling-nuts list gets started!

Tim N3QE

On Thu, Feb 23, 2017 at 3:23 PM, Poul-Henning Kamp 
wrote:

> Have we talked about this yet ?
>
> https://arxiv.org/abs/1609.06183
>
> https://arxiv.org/abs/1607.03731
>
>
>
> --
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
> ___
> 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.

Re: [time-nuts] Coming to a drive-way near you: Optical Lattice clocks

[Bob Camp]

Hi

I agree with their premise that to be useful you need transportable clocks. I’m 
not quite sure
that something the size (and weight) of a pickup truck is really transportable. 
Yes one can 
move it around (unlike a small mountain)  …. Transporting something like that 
from here to 
Europe and back *would* make the charges FedEx comes up with on a  40Kg box 
look 
cheap though :)

Bob

> On Feb 23, 2017, at 3:23 PM, Poul-Henning Kamp  wrote:
> 
> Have we talked about this yet ?
> 
> https://arxiv.org/abs/1609.06183
> 
> https://arxiv.org/abs/1607.03731
> 
> 
> 
> -- 
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
> ___
> 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.

Re: [time-nuts] Trimble "UCCM" GPSDO adevs

[John Ackermann N8UR]

This is very, very cool, Mark.  I've been concerned for a long time that 
people take way too seriously what you properly call "bogo-ADEV" that's 
self-generated from the GPSDO.  Integrating a counter that compares 
against an external source is a huge win.


But I want to remind everyone that as neat as the TICC is, like any time 
interval counter it still has limited performance for short-term ADEV. 
The ADEV floor is typically a bit under 1x10e-10 at one second, and goes 
down at a slope of -1 (so, a bit under 1x10e-13 at 1000 seconds averaging).


If you're comparing a pair of decent sources, results at measurement tau 
of less than at least several hundred seconds are likely showing counter 
jitter, not real performance.  It's important always to keep that in mind.


John


On 02/23/2017 05:27 PM, Mark Sims wrote:

I just added the capability of Heather to monitor and control a GPS device while 
simultaneously calculating ADEVs from an external time interval counter like the TAPR 
TICC  (it can also work with the time interval analyzer only).  This mode lets Heather 
calculate true adevs instead of "bogo-adevs" derived from the GPSDO 
self-reported control loop statistics.

As a test.  I connected Heather to a Trimble "UUCM" GPSDO and a TICC.  The TICC 
channel A is the UCCM and channel B is a Oscilloquartz Star-4 GPSDO.  The TICC reference is 
a ERC-130 rubidium (uses an LPRO-101.  Attached is a screen dump of a 12 hour run.  The UUCM 
beats the Star-4 at tau<20 seconds.

There are a few variants of the UCCM receivers out there... one by Symmetricom and at least two (UCCM and UCCM-P) by 
Trimble.  They run off of 6VDC.   Performance is not too shabby for a small $70-$120 GPSDO.   Search Ebay for 
"Trimble 65256",  "Trimble GPSDO", or "Symmetricom GPSDO".   Be aware that there are 
sellers sending units that were damaged in salvage.   I'd probably go with a "tested" unit.



___
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] Trimble "UCCM" GPSDO adevs

[Mark Sims]

I just added the capability of Heather to monitor and control a GPS device 
while simultaneously calculating ADEVs from an external time interval counter 
like the TAPR TICC  (it can also work with the time interval analyzer only).  
This mode lets Heather calculate true adevs instead of "bogo-adevs" derived 
from the GPSDO self-reported control loop statistics.

As a test.  I connected Heather to a Trimble "UUCM" GPSDO and a TICC.  The TICC 
channel A is the UCCM and channel B is a Oscilloquartz Star-4 GPSDO.  The TICC 
reference is a ERC-130 rubidium (uses an LPRO-101.  Attached is a screen dump 
of a 12 hour run.  The UUCM beats the Star-4 at tau<20 seconds.

There are a few variants of the UCCM receivers out there... one by Symmetricom 
and at least two (UCCM and UCCM-P) by Trimble.  They run off of 6VDC.   
Performance is not too shabby for a small $70-$120 GPSDO.   Search Ebay for 
"Trimble 65256",  "Trimble GPSDO", or "Symmetricom GPSDO".   Be aware that 
there are sellers sending units that were damaged in salvage.   I'd probably go 
with a "tested" unit.___
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] Coming to a drive-way near you: Optical Lattice clocks

[Poul-Henning Kamp]

Have we talked about this yet ?

https://arxiv.org/abs/1609.06183

https://arxiv.org/abs/1607.03731



-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
___
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.

Re: [time-nuts] HP5328A + NI GPIB-ENET/1000

[Scott Stobbe]

If your counter is showing up in the NI device tree, you should be pretty
close to getting it working.

I haven't used a 5328A, but I suspect the command you have shown above is
sample code for a basic program, the actual HPIB command may just be a 'T'.

On Thu, Feb 23, 2017 at 1:37 AM, James Peroulas  wrote:

> Does anyone have experience using older HP equipment with the NI
> GPIB-ENET/1000 GPIB to ethernet box? Is this even possible with such an old
> piece of equipment? I'm very familiar with using SCPI commands over telnet
> but not so familiar with HPIB.
>
> So far I've installed the NI 488.2 software which has successfully found
> both the GPIB-ENET/1000 box and the HP5328A connected to it. I've opened
> the NI-488.2 communicator which should allow me to send commands to the
> counter and read back results. However, anything I type in the "send
> string" returns a timeout.
>
> The manual for the 5328A shows example commands such as:
> CMD"?U*","T"
> But it's not clear to me what portion (all?) is the string that I should be
> sending to the 5328a.
>
> The 5328a is set to "Talk Only" mode via dip switch. I would expect that I
> should be able to just 'read' the results, but 'read' also times out...
>
> Thanks for any pointers,
> James
> ___
> 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] Nortel NTGS and LH 5

[Mark Sims]

Lady Heather has detected a GPS week rollover event... 10 seconds of 
consecutive years less than 2016.  When this happens Heather adds 1024 weeks to 
the receiver date until it is past 2016.   This can happen when Heather is 
connected to a receiver that is starting up and sending invalid dates or a 
receiver with rollover problems.  It can also happen with a receiver that reset 
or glitched while Heather was running.  You can force the rollover offset with 
the /ro=seconds_to_add command  /ro=0 will effectively disable rollover 
compensation.

---

>  Perhaps something just went wonky in my setup but just noticed that the date 
> that LH 5 (TSIP) is displaying with my Nortel is very wrong. Any idea how to 
> correct. Could have happened after I did a cold reset a couple weeks ago.

___
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.

Re: [time-nuts] HP5328A + NI GPIB-ENET/1000

[Scott McGrath]

'Talk Only' mode responds to serial poll mode which is querying all instruments 
on the bus.   And it's primary use is in automated test systems 

You want to disable talk-only mode for normal interactive control of an 
instrument using GPIB

Content by Scott
Typos by Siri

> On Feb 23, 2017, at 1:37 AM, James Peroulas  wrote:
> 
> Does anyone have experience using older HP equipment with the NI
> GPIB-ENET/1000 GPIB to ethernet box? Is this even possible with such an old
> piece of equipment? I'm very familiar with using SCPI commands over telnet
> but not so familiar with HPIB.
> 
> So far I've installed the NI 488.2 software which has successfully found
> both the GPIB-ENET/1000 box and the HP5328A connected to it. I've opened
> the NI-488.2 communicator which should allow me to send commands to the
> counter and read back results. However, anything I type in the "send
> string" returns a timeout.
> 
> The manual for the 5328A shows example commands such as:
> CMD"?U*","T"
> But it's not clear to me what portion (all?) is the string that I should be
> sending to the 5328a.
> 
> The 5328a is set to "Talk Only" mode via dip switch. I would expect that I
> should be able to just 'read' the results, but 'read' also times out...
> 
> Thanks for any pointers,
> James
> ___
> 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] Nortel NTGS and LH 5

[Bryan _]

Perhaps something just went wonky in my setup but just noticed that the date 
that LH 5 (TSIP) is displaying with my Nortel is very wrong. Any idea how to 
correct. Could have happened after I did a cold reset a couple weeks ago.


-=Bryan=-
___
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] HP5328A + NI GPIB-ENET/1000

[James Peroulas]

Does anyone have experience using older HP equipment with the NI
GPIB-ENET/1000 GPIB to ethernet box? Is this even possible with such an old
piece of equipment? I'm very familiar with using SCPI commands over telnet
but not so familiar with HPIB.

So far I've installed the NI 488.2 software which has successfully found
both the GPIB-ENET/1000 box and the HP5328A connected to it. I've opened
the NI-488.2 communicator which should allow me to send commands to the
counter and read back results. However, anything I type in the "send
string" returns a timeout.

The manual for the 5328A shows example commands such as:
CMD"?U*","T"
But it's not clear to me what portion (all?) is the string that I should be
sending to the 5328a.

The 5328a is set to "Talk Only" mode via dip switch. I would expect that I
should be able to just 'read' the results, but 'read' also times out...

Thanks for any pointers,
James
___
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.