Hello Dave,
being 'time-nuts', it is of course to know the time of day to the
nanosecond!
That said, I truly believe there are only two wristwatches out there for
the serious time-nutter:
https://www.kickstarter.com/projects/846511652/the-worlds-first-true-atomic-wristwatch-the-cesium/updates
Dear Don and all,
no mentioning of the Seiko Astron GPS Solar?
http://www.seiko-astron.com/
73s
Achim DH2VA
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Fellow Time-Nutters,
I am trying to get in contact with Jackson Labs but without any success
for 3 weeks now.. does anybody has informtion if they are still in business?
Best regards,
Achim
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Dear all,
the GALILEO system is supposed to go online today (at least for initial
operational capability). Does anybody of you has a GALILEO compatible
receiver and sees already a difference?
Best regards,
Achim
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Fellow time-nutters,
CERN has hosted this week the 9th White Rabbit workshop. As a reminder:
White Rabbit is a open hardware fiber-based network which allows for
precise (sub-ns) time transfer over fiber lengths of up to 10km (and
even more) between attached nodes.
The presentations are online:
Dear all,
I can confirm total loss of GPS constellation here on Feb 14th,
going from 7 to 4 sats on 00:14:45 UTC
going to nil on 00:16:40 UTC
intermittent single sat tracking in between
back to 7 sats shortly after 02:00:00 UTC
I typically receive here between 5-8 sats with my Thunderbolt
I should add that I saw a similar disturbance of the force on my
Shera-type GPSDO. Cannot remember what GPS rx is installed but likely
some Jupiter-T model.
Cheers,
Achim
On 15.02.2016 08:08, Achim Vollhardt wrote:
> Dear all,
>
> I can confirm total loss of GPS constellation here on
Count me in as well, if you need another participating station. I have
my Thunderbolt running 24/7 with a solid stationary antenna..
Achim
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Hi Mike,
try typing:
s: Survey
a: Antenna
s: Signal
in that sequence from main menu.
73s Achim, DH2VA
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Hi Peter,
first of all, LH can only 'control' temperature, if it has a hand to do
so.. meaning it can steer the RTS line of the RS232 to control a small
fan via PWM. Actually, it could also heat (by putting there a heating
element) but I haven't seen anybody doing it yet. If there is no
Hi Garren,
just as an example, what can be done with the LH internal temperature
controller:
http://gulp.physik.uzh.ch/heather/
Hardware pictures can be found here:
http://gulp.physik.uzh.ch/heather/pics/
Achim
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Peter,
I did let the internal algorithm make it's optimization (can't remembere
which key sequence it was) once everything has settled. The lab here has
2-3 degC ambient variations over the day, but putting the Thunderbolt in
a box which is ventilated (well.. fan-ed) by the LH temperature
Fellow Time-Nuts,
I am trying to use the server.exe under Linux via wine. Heather.exe runs
nicely, but for server.exe I run into trouble as it shuts down
immediately again:
avollhar@freq:~/.wine/drive_c/Program Files/Heather$ wine server.exe com1
Dear all,
for those interested, this is a nice summary of the cause of the wrong
OPERA measurement.
http://profmattstrassler.com/articles-and-posts/particle-physics-basics/neutrinos/neutrinos-faster-than-light/opera-what-went-wrong/
Regards,
Achim
Hi Attila,
speaking about finger pointing, I would like to make clear, that the
loose connector was on the italian (OPERA) side and not on the
french-swiss side (CERN). The news articles all cited CERN got it wrong,
but as a matter of fact it was OPERA.
Achim
I didn't questions his
Dear John and all,
I do work in high energy physics and we use LEMO and other standards.
For some years now, I have started to advertise against LEMO (in
particular the LEMO 00 size), as it is VERY sensitive to mechanical
defects and partial connection (yes, you can ..). We have found very
Fellow Time-Nuts,
I am trying to run LH on an Alix 3D3 single-board PC:
http://www.pcengines.ch/alix3d3.htm
Being only a 500 MHz Geode CPU, there is not much power to work with.
Still, running Debian Linux with Wine allowed me to make LH work..
BUT: A single second tick takes about 3-4
Hi Bill,
what about White Rabbit?
http://www.ohwr.org/projects/white-rabbit/wiki/Description
Successor of NTP.. PTP: precision time protocol.
It delivers Gigabit Ethernet and precise (1nsec) timing over singlemode
fiber. You would have to connect all devices into a fiber network
instead of a
No HBG clock but a HBG-disciplined OCXO in our lab.. we forgot to change
the receiver to DCF77 but will have to do that on Tuesday, when business
restarts :)
Achim
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Fellow Time-Nuts,
the polyfuse was finally replaced now with a thermal fuse. The closest I
got my hands on was 115degC. Fits nicely and oven is heating up again :)
Pictures are updated (well, the last picture at least.. just for reference):
http://gulp.physik.uzh.ch/HP10811_oven-repair/
Fellow Time-Nuts,
first of all thank you for all the feedback and advice.. especially
about the mistake of putting in a current protection rather than a
temperature protection. I mislead myself into using a polyfuse as these
work thermally as well :( That said, 'Shera' locked immediately again
Fellow time-nuts,
my humble HP10811 + Shera controller combo signaled loss of lock since
about a week after 5 years of non-stop operation. Frequency measurement
showed it to be ca. 90 Hz low and the added oscillator enclosure (8mm
aluminum case) barely exceeded room temperature. Measurement
Maybe I missed it, but did somebody think about the uBlox LEA-6 rx? has
two timemark outputs, which are programmable.. so you can have both 1PPS
and 1000PPS.
Achim
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Time-Nutties,
how about using a small uC (PIC/AVR) clocked with 100ns instruction
speed. Start = 1PPS from GPS, Stop = 60 Hz Edge? Use internal capture
hardware to count processor cycles in between.
Send output once per second via FT232(USB) to host PC.. alternatively
store locally on SD
Hi Poul,
I would guess the 100ns granularity should be already overkill, giving
an error in the order of 1e-7. To be compared with mains instability of
1e-5:
http://www.leapsecond.com/pages/mains/
I would try to keep it as simple as possible... maybe even only one IC,
there exist
Hello group,
upon request, Wenzel sent me a datasheet for the 500-7044. I am a little
bit reluctant to put it openly on the WWW, but if anybody is interested,
contact me off-list.
Achim
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John,
try out the u-Blox Control Center at www.ublox.com. Primarily writte for
their suite of GPS units, but works just fine with any NMEA enabled
receiver.
73s Achim, DH2VA
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Hi Steve,
as the manual 'asks' for an active antenna with at least 10dB external
gain, I would not expect the M12M to be too sensitive.. but as long as
you do have an active external antenna, it should not matter much.
I have here an M12M running in parallel with a TBolt fed by a common
Dear Bert and all,
maybe I missed it, but how can a linear regulator filter out transients
from a switched PSU? The cited LT1764A has less than 30dB Suppression at
100 kHz getting worse for higher frequencies.Even the famous 7805 had
only 50 dB suppression. For going to a real clean PSU, I
After some tweaking of the temperature controlled fan setup (not always
to the better), I finally settled on a setup with great results.
- Peak-peak variations in stable environments are down to 0.02K.
- opening window for few minutes disturbs only 0.03K down.
- TBolt sits now nice and stable
Luciano,
the fan controller setting can be seen here in near-realtime:
http://gulp.physik.uzh.ch/heather/
I let it autotune once by 'ka4' and left it like that.. works fine.
For photos, I would have to open the box again.. which would seriously
disturb the temperature :) I will do internal
Hi list,
I think this is the solution:
http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q131/9/76.aspNoWebContent=1
/NoSerialMice in boot.ini of Windows XP
73s Achim, DH2VA
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Dear Warren and Mark,
I have hacked together a very simple setup with the transistor circuit
and the opened Thunderbolt case (not its own case, but the front lid of
my outer case opened). The CPU fan was placed about 2 away, only
blowing indirectly into the case..
The results are simply
Dear Mark, Warren, Arnold,Bob and Charles,
Thank you all for the interesting responses. I am most interested about
the implemented temperature control in Lady Heather:
I see that there is a setpoint to be entered via 't'+'t', but I am
uncertain about the function of it. From the heather.cpp
Hi Tijd,
what about MC12026A ?
Farnell No. 1468725, 10 EUR single quantity
1.1 GHz div 8, 9, 16 or 17
Project sounds great!
73s Achim, DH2VA
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Dear Group,
it might be of interest, that I have some measured data on the ACAM
TDC-GP2 chip, which I am using for another project in our lab here.
Single shot resolution of 54 ps rms was quickly achieved, which is close
enough to the 50 ps quoted in the datasheet for me to believe it :)
As I
I(k) = (E(k)+E(k-1))*Ki*Ts/2 + I(k-1)
P(k) + Kp*E(k)
Sorry.. it must read of course:
I(k) = (E(k)+E(k-1))*Ki*Ts/2 + I(k-1)
P(k) = Kp*E(k)
73s Achim, DH2VA
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Dear Rob,
the NavSync has a timing accuracy of 30 ns rms, while the M12M 10ns rms,
or even 2ns when using the clock granularity message..
That why I thought it is interesting..
73s Achim, DH2VA
Don't know about this one, but you might be interested in the
following.
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