Re: [time-nuts] PI Zero W LED Desktop Clock with 10ths of Seconds / NTP disciplined

[jgeorge_timen...@nbi6.com]

Take a bow, Nick! :-)

> On Jul 1, 2017, at 9:45 PM, M. George  wrote:
> 
> I just finished an LED clock kit that can be found on hackaday.io by Nick
> Sayer.   Below is a link to a couple of one take videos
>  I made of the clock.  It's a
> nice piece of eye candy.  I haven't see an LED clock kit like this that
> uses a lite distribution of Linux where you have a server for the clock
> running NTP.  The code that runs the clock is a C program that you compile
> and run when the OS boots up.  It's nice that the PI Zero W is wireless for
> the clock... where it looks like a regular desk clock, but for the time-nut
> you can ssh in and check things out and look at loopstats etc...an NTP
> driven desk clock with 10ths of seconds.
> 
> YouTube Video :
> https://www.youtube.com/watch?v=cAXFDt3PBJg
> 
> Pictures
> 
> : http://www.nc7j.com/pa/main.php?cmd=album=NG7
> M%2FRaspberry+PI%2FPI+Zero+W%2FDesktop+NTP+Clock
> 
> I have no connection to the creator of the project or reason to give the
> project a plug other than I had fun making the simple kit and setting up
> Raspbian Lite to drive the PI Zero W., The creator of the kit is Nick Sayer
> on hackaday.io
> , I
> suspect he might get a few more looks at this project now:
> https://hackaday.io/project/20156-raspberry-pi-zero-w-desk-clock
> 
> Enjoy, Max NG7M
> 
> -- 
> M. George
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[time-nuts] 5370B Question / help needed

[Mark Sims]

This is a very common problem...  basically the fan blows directly down the 
chassis onto the front panel area where a large dust bunny builds its nest.  
The switches are gold plated leaf springs that slide on a gold plated circuit 
board.  They are open to the environment and collect all sort of dust and 
schmutz.

If you need to troubleshoot the unit, I have a few extender card kits left... 
$30+shipping for the three board set.  Two 44-pin boards are used to extend a 
card from the mainframe and there is a 36 (?) pin card that can be used with 
the front panel or oscillator buffer card..


---

> One other observation, probably related: After powerup it took several
vigorous switch activations of the COM/SEP switch before the thing swung
into action at all
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[time-nuts] PI Zero W LED Desktop Clock with 10ths of Seconds / NTP disciplined

[M. George]

I just finished an LED clock kit that can be found on hackaday.io by Nick
Sayer.   Below is a link to a couple of one take videos
 I made of the clock.  It's a
nice piece of eye candy.  I haven't see an LED clock kit like this that
uses a lite distribution of Linux where you have a server for the clock
running NTP.  The code that runs the clock is a C program that you compile
and run when the OS boots up.  It's nice that the PI Zero W is wireless for
the clock... where it looks like a regular desk clock, but for the time-nut
you can ssh in and check things out and look at loopstats etc...an NTP
driven desk clock with 10ths of seconds.

YouTube Video :
https://www.youtube.com/watch?v=cAXFDt3PBJg

Pictures

: http://www.nc7j.com/pa/main.php?cmd=album=NG7
M%2FRaspberry+PI%2FPI+Zero+W%2FDesktop+NTP+Clock

I have no connection to the creator of the project or reason to give the
project a plug other than I had fun making the simple kit and setting up
Raspbian Lite to drive the PI Zero W., The creator of the kit is Nick Sayer
on hackaday.io
, I
suspect he might get a few more looks at this project now:
https://hackaday.io/project/20156-raspberry-pi-zero-w-desk-clock

Enjoy, Max NG7M

-- 
M. George
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Re: [time-nuts] Ph.D. and Postdoc Positions at Max-Planck Institute for Infor...

[KA2WEU--- via time-nuts]

It must be almost 2 PM in the morning ! Congratulations , can I help ?good  
luck , Ulrich 
 
 
In a message dated 7/1/2017 7:52:54 P.M. Eastern Daylight Time,  
att...@kinali.ch writes:

Moin  moin,

Our group (where I am doing my PhD) is currently looking for PhD  or Postdoc
candidates. Our research spans an extremely wide area from  math/theoretical
computer science to low noise electronics and ASICs. One  of our main focus
is fault-tolerant clock synchronization in the low ps  level. We would
like to especially encourage people with a solid background  in
electrical/electronics engineering to apply. Even more so, if you  know
how to deal with precision time and frequency generation and/or  
measurement. 

On a personal note: because our research is on such a  wide field, you
are free to pursue your own research and are encouraged to  do so, as
long as it fits somehow within the general topic (which is not  hard at 
all).

If you have questions, feel free to contact either  Christoph or me
directly.

Attila Kinali

Date: Tue, 30 May 2017 16:50:46 +0200
From: Christoph  Lenzen 
Subject: Ph.D. and Postdoc Positions  at MPI for Informatics, Saarbrücken, 
Germany

The Theory of Distributed  and Embedded Systems  group
(https://www.mpi-inf.mpg.de/departments/algorithms-complexity/research/theor
y-of-distributed-and-embedded-systems/
)  in the Department for Algorithms & Complexity of the MPI  for
Informatics invites Ph.D. and Postdoc applications. Our research  spans
a broad range. At one end of the spectrum, we are interested in  all
aspects of the theory of distributed systems. At the other end,  we
apply these principles in the development of fault-tolerant  hardware,
including FPGA and analog/mixed-signal ASIC prototypes.  Accordingly, we
welcome all applicants with a background in computer  science,
electrical engineering, mathematics, computer engineering, or  related
fields.

Successful applicants will take part in an ERC  Starting Grant project,
which has the ambitious goal of devising highly  robust, yet efficient
systems that do not rely on centralized clocking  methods. The teaching
load is low and there is room to explore other  research avenues;
especially postdocs are encouraged to follow their own  research agenda
next to the ERC project.

For informal inquiries as  well as filing an application, please send me
an email  (clen...@mpi-inf.mpg.de). A typical application should contain
your CV,  publication list, a brief statement (up to about one page) of
your  motivation and research interests, and your two most  interesting
publications (links suffice).

The Max Planck Society is  committed to employing more individuals with
disabilities and expressly  welcomes these to apply. The Max Planck
Society seeks to increase the  percentage of women in the areas where
they are underrepresented and  expressly encourages these to apply.

-- 
It is upon moral qualities  that a society is ultimately founded. All 
the prosperity and technological  sophistication in the world is of no 
use without that  foundation.
-- Miss Matheson, The Diamond Age, Neil  Stephenson
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[time-nuts] Ph.D. and Postdoc Positions at Max-Planck Institute for Informatics, Saarbrücken, Germany

[Attila Kinali]

Moin moin,

Our group (where I am doing my PhD) is currently looking for PhD or Postdoc
candidates. Our research spans an extremely wide area from math/theoretical
computer science to low noise electronics and ASICs. One of our main focus
is fault-tolerant clock synchronization in the low ps level. We would
like to especially encourage people with a solid background in
electrical/electronics engineering to apply. Even more so, if you know
how to deal with precision time and frequency generation and/or measurement. 

On a personal note: because our research is on such a wide field, you
are free to pursue your own research and are encouraged to do so, as
long as it fits somehow within the general topic (which is not hard at all).

If you have questions, feel free to contact either Christoph or me
directly.

Attila Kinali

Date: Tue, 30 May 2017 16:50:46 +0200
From: Christoph Lenzen 
Subject: Ph.D. and Postdoc Positions at MPI for Informatics, Saarbrücken, 
Germany

The Theory of Distributed and Embedded Systems group
(https://www.mpi-inf.mpg.de/departments/algorithms-complexity/research/theory-of-distributed-and-embedded-systems/
) in the Department for Algorithms & Complexity of the MPI for
Informatics invites Ph.D. and Postdoc applications. Our research spans
a broad range. At one end of the spectrum, we are interested in all
aspects of the theory of distributed systems. At the other end, we
apply these principles in the development of fault-tolerant hardware,
including FPGA and analog/mixed-signal ASIC prototypes. Accordingly, we
welcome all applicants with a background in computer science,
electrical engineering, mathematics, computer engineering, or related
fields.

Successful applicants will take part in an ERC Starting Grant project,
which has the ambitious goal of devising highly robust, yet efficient
systems that do not rely on centralized clocking methods. The teaching
load is low and there is room to explore other research avenues;
especially postdocs are encouraged to follow their own research agenda
next to the ERC project.

For informal inquiries as well as filing an application, please send me
an email (clen...@mpi-inf.mpg.de). A typical application should contain
your CV, publication list, a brief statement (up to about one page) of
your motivation and research interests, and your two most interesting
publications (links suffice).

The Max Planck Society is committed to employing more individuals with
disabilities and expressly welcomes these to apply. The Max Planck
Society seeks to increase the percentage of women in the areas where
they are underrepresented and expressly encourages these to apply.

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Re: [time-nuts] 5370B Question / help needed

[Thomas Allgeier]

Yes, they are both set to "positive".  Leaving the start at "pos" and
switching the stop to "neg" gives 66 ns. One more observation, which
probably does make sense: If I set the ARming to +/-TI and toggle the
Period Complement the "sum" is always very close to 100ns: 15 is
complemented by -85 and 66 by -34. All this is for Trigger Levels at Preset.

When I "tune" the levels to get 100 ns at +TI and then switch to +/-TI I
get around 20 ps, and the Complement button has no effect on this.

On Sat, Jul 1, 2017 at 9:38 PM, Poul-Henning Kamp 
wrote:

> 
> In message  gmail.com>, Thomas Allgeier writes:
>
> >Going through the motions of measuring TI with it's own 10MHz ref as input
> >(as described in the manual) I don't get 100 ns, but around 15 ns. So this
> >is with the switch set to START COM. Oddly enough I get the same 15 ns
> with
> >the switch set to SEP, and going through a 6 ft cable between start and
> >stop.
>
> Have you checked the trigger polarities ?
>
>
> --
> 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.
>
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Re: [time-nuts] 5370B Question / help needed

[Poul-Henning Kamp]

In message 
, Thomas 
Allgeier writes:

>Going through the motions of measuring TI with it's own 10MHz ref as input
>(as described in the manual) I don't get 100 ns, but around 15 ns. So this
>is with the switch set to START COM. Oddly enough I get the same 15 ns with
>the switch set to SEP, and going through a 6 ft cable between start and
>stop.

Have you checked the trigger polarities ?


-- 
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.
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[time-nuts] 5370B Question / help needed

[Thomas Allgeier]

I got hold of a 5370B cheaply but it turns out it may have a fault:

Going through the motions of measuring TI with it's own 10MHz ref as input
(as described in the manual) I don't get 100 ns, but around 15 ns. So this
is with the switch set to START COM. Oddly enough I get the same 15 ns with
the switch set to SEP, and going through a 6 ft cable between start and
stop.

Now I can "tune" the thing to display 100 ns by changing the trigger
levels. Start at 0.6 V and stop at -0.1 V will achieve this. Once again
this does not change by going from COM to SEP i,e. by adding the 6 ft delay.

One other observation, probably related: After powerup it took several
vigorous switch activations of the COM/SEP switch before the thing swung
into action at all - i.e. the first reaction with COM setting was an Err
02, and with SEP I got the 15 ns as described above. So that switch may be
a bit dodgy.

Measuring in frequency mode gives the 10 MHz quite accurately, less than
1mHz off with its own ref as stop input. Feeding the 10 MHz in from my
GPSDO also ties up OK, it is around 40mHz off with perhaps 5-10mHz jitter.

Has anybody come across anything similar? I couldn't find much in that vein
in the archive but may have overlooked something. The one thing I was
worried about at first was the heat sinks at the rear getting really hot
but it seems I'm not the only one with that observation.

To some extent it looks like the input levels for triggering are off, but
then the fact that the 6 ft cable don't show up as extra delay may mean
there is something else wrong.

Looks like some "fun with Bill and Dave" lies ahead if somebody can point
me in the right direction.

Thanks in advance,
Thomas.
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