as Ref signal for counter and try to
measure another OCXO using that ref. That will give me some clue if
Trimble TB has an issue.
Regards,
Vlad
On 2015-05-28 03:32, Tom Van Baak wrote:
Hi Vlad,
Before we get to your phase noise question...
Your plots ALTINEX-DA-F.png ALTINEX-DA-T.png look
to counter input. 8 hours later, I'll
see what will be on chart.
Regards,
Vlad
On 2015-05-28 21:50, Bob Camp wrote:
Hi
*IF* I’m understanding you correctly, you are measuring this data
with an HP 5386.
That’s only a 4 ns counter. I agree with Tom that there is something
weird in your setup
Hello,
Some time ago, I got Efratom/Datum GPS-FC item. The apparatus itself
looks like good quality weather-proof aluminium case with embedded GPS
antenna. It has only one connector. That connector is using to supply
the power to the unit and as well to get 10Mhz signal from it.
Here is
)@@Ea
060107DF001F33AD2C01000111001F0007000C0826A20F0018200620040008
Which, I think, looks like Motorola protocol. And that means the GPS
module is responsive.
Regards,
Vlad
On 2015-05-31 16:47, Bob Camp wrote:
Hi
:
http://www.patoka.ca/OCXO/Moto1.JPG
http://www.patoka.ca/OCXO/Moto2.JPG
I left that unit up and running overnight, and even after that its still
not show me real location and number of visible satelites is still
zero.
Regards,
Vlad
On 2015-05-31 21:50, paul swed wrote:
Quite difficult
I am curious, how the integrated gates could be compared for those
created on discrete elements ? Let say simple gates like this:
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html
Regards,
Vlad
On 2015-05-31 18:23, Attila Kinali wrote:
On Sun, 31 May 2015 14:06:26 -0400
If its really number of USB devices, directly connected to the PC, then
it could be issue with overload of 5V bus on USB hub. It has certain
limitation.
As a workaround, you could try to use external USB hub with its own PSU.
--
WBW,
V.P.
On 2015-05-29 15:17, Cash Olsen wrote:
I have been
18:59, Bob Camp wrote:
Hi
I think that looks about as good as your counter can do. The slope down
at
the start is the resolution of the counter. The slope up on the right
is the actual stability of
the oscillator.
Bob
On May 29, 2015, at 9:52 AM, Vlad t...@patoka.org wrote:
Hello,
I've
Hello,
I've finished the test. Here is the links to charts:
http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A-AD.png
http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A-PD.png
http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A.png
It looks different, but its not better, I think.
Regards,
Vlad
On 2015-05-28
May be using DDS chips ?
Here is interesting work regarding DDS Phase Noise :
http://rubiola.org/pdf-articles/conference/2012-ifcs-DDS.pdf
On 2016-05-30 07:06, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
I was thinking about designing a 2 m (144-146 MHz) ->HF (28-30 MHz)
transverter,
Looking to the complex solutions for the frequency divider (CPLD/MCU), I
start to think about skews and propagation delays. Its not obvious from
the first glance. But I think such things exists.
It could be interesting to compare the numbers. Is it worth to consider
some correction to avoid
I was thinking to make a frequency divider by using FPGA. Here is my
attempt to implement it using VHDL.
This is frequency divder plus D flip-flop which I was planed to use as
source of 60Hz for my Telechron clock.
However I never implement it in HW. Instead I was using STM32F4 with its
Following my previous note: today I did create simple test installation
using CPLD Xilinx XC2C32A. The project just get input from 50Mhz OSC and
divide it to get 1Hz output to send it to two LEDs and defined clk_out
pin. As I program it - the LEDs was blinking with 1Hz frequency. Which
means
For very long time, may be Main Frequency (60 Hz) could be utilised.
Say, MCU could count and compare Zero-Crossings and impulses from DS32xx
chips. After several days, you'll see where it goes.
On 2016-06-27 11:22, Pete Stephenson wrote:
Hi all,
I have a few Maxim DS3231
quot;two 3906" schema.
74AC/74HC solution somehow remove/ignore it. I don't know how to explain
this. Its just from my setup and my observation and probably not correct
at all.
Based on measurements, all of it comes out in the “no big deal”
range for normal applications.
Bob
On J
I was looking to the frequency periods for 110V 60Hz main for that time:
http://www.patoka.org/OCXO/main.png
http://www.patoka.org/OCXO/main2.png
Could be coincidence. But its noticeable events at Feb 00:15 UTC and Feb
14 01:30 UTC. The MCU counter referenced by regular OCXO (its not
Just for fun, I was created the chart for 60hz main behaviour for the
night when we had EST to EDT time switch.
Its 2AM EST, Mar 13. Which is, I beleive 6AM UTC. I was surprised I
noticed the event when I created spline smooth line for the data
http://www.patoka.ca/OCXO/60hz-est2edt.png
May
I would say its even more convenient to monitor binary format, since its
more compact and could be read as a structures
// u-blox UBX protocol essentials
typedef struct ubx_header {
unsigned char preamble1;
unsigned char preamble2;
unsigned char msg_class;
Clock Card, but unfortunately I didn't get any answer yet.
So, may be somebody has that Linux drivers or working link to its
location ? I would be very appreciate. In other case, the only thing I
could do with this piece of hardware is to get nice-looking 100Mhz OCXO
from it.
Thanks in advanc
eful items using some salvaged parts.
Regards,
Vlad
On 2016-03-15 19:43, Paul wrote:
I got one of these:
http://www.ebay.com/itm/Trimble-GPS-Receiver-GPSDO-10MHz-1PPS-GPS-Disciplined-Clock-with-rs232-port-/252162780444
but the PPS output is bad. Funny becaue the PPS LED is working just
fine.
s Caudle wrote:
On Wed, March 30, 2016 12:04 am, Vlad wrote:
https://www.patoka.ca/OCXO/TBvsSL/StarLocIImonitor.png
That unit is in holdover, it will not produce an accurate 10MHz output.
Only one satellite is in view, so either it does not have a good
connection to an antenna, or the recei
If all independent clocks is stable enough, then correlation between of
them could be re-considered after the data will be collected, I think.
On 2016-04-11 01:00, Bruce Griffiths wrote:
There is a proposal to use multiple light bucket style optical
telescopes to do Intensity stellar
e of capturing timer and then delta
between two readings.
Works great for me.
Regards,
Vlad
On 2016-04-06 21:21, Jay Grizzard wrote:
Since it seems to be a week for new projects on time-nuts... ;)
So I've been wanting to set up a power line frequency monitor for a
while,
and now(ish) seem
Hello,
Today I was trying to use LH Software with Datum "StarLoc II" GPSDO.
While LH is not supported that beast, it could read and decode some TSIP
messages coming from it.
Basically, StarLoc II sending 8F-AB and 8F-AC for every second.
Here is the result:
Hello,
Today I woke up with an idea to search the resources about PTP
Grandmaster Clock building.
However, its appeared, only commercial solutions is available now. Its
pretty common to see several NTP implementation using various HW (GPS is
most frequent now)
But almost no "home-brew"
Driven. So, the "SuperCycle" continues to run. The timer count
the value is stored in a 3-byte register that is decremented by the
software.
Regards,
Vlad
On 2016-03-20 14:26, Martyn Smith wrote:
Hello,
First of all quick apologies for sending an email last week without
deleting all the
Hello,
I am looking for for the advise regarding some strange difference in
frequency between of two GPSDO: Trimble Thunderbolt and Datum Starloc II
Measuring by HP 5386A counter it shows something around 0.014 delta.
If I connect TB as REF source then I am getting numbers like this:
May be somebody could recognize, what 10.014 Mhz could be used for
?
It sort of looks more like an unlocked OCXO than a magic frequency.
Measure phase instead of frequency; see how the phase drifts over time.
Also check if the magic frequency varies or drifts over time.
See if the offset
I tried to see the 1PPS on my oscilloscope. Here is the series of
screenshots from that experiment:
https://www.patoka.ca/OCXO/TBvsSL/
I also tried to catch something using HP5386A. However I was not able to
measure the pulse.
Regards,
Vlad
On 2016-03-29 18:53, Henry Hallam wrote
odules has battery pin (and it is Pin1 on those 10-pin
connectors). I am curious if it will works just to solder some basic 3V
battery to it ? Thanks !
Regards,
Vlad
On 2016-03-30 13:38, Vlad wrote:
TB has three satellites in "green" state. I'll have a look to the
issue closely. Lo
DHCP is handy to provide the IP address and specify which NTP server to
use. Using DHCP I don't need to setup all the network settings for my
project. The NTP packet parser itself is really small and doing its duty
very well. Using such setup, it gives me flexibility to choose the
different
May be some more accurate alternative to AD8302 could do that. AD8302
could measure Gain/Loss and Phase up to 2.7 GHz. I using one in my
project and its doing its job right (I think).
On 2016-07-28 19:12, Jerome Blaha wrote:
Hi Guys,
This is a little outside of time-nuts scope, but not
Last year I created GPS-based Nixie clock for myself. After all the
considerations I decide to use GPS receiver with external antenna. Not
so aesthetic, but more reliable for me. I was using DS32xx chip as a
clock. And GPS plus 1PPS output from GPS to set/sync that DS32xx. So,
GPS module is
In addition, even MCU has not enough resources to handle TCP/IP, DHCP
and NTP, it is some solutions available to outsource it to dedicated
chips. I was using WIZ5100 (assembled as a modules) with great success.
Regards,
Vlad
On 2016-07-12 12:01, Chris Albertson wrote:
What kind of micro
Looks like I have similar StarLoc II. But I bough the item from U.S.
Yes, it takes forever to set its location, for some uncertain reason. I
did try to change UT module on it. Even using v4 instead of original v2.
No luck with this. Its behave the same way. Without that position, the
10Mhz
In my project box with TB, I noticed higher than usual temperature as we
had weather heat waves. It was around 50 Celsius. The only remedy for
that was to implement simple fan at rear of the box. And it helps to get
back to usual numbers (around 40 degree C). However even at 50 C, my TB
Hello,
I am wandering if anybody had the same issue with Symmetricom PCIe-1000
PTP controller. Basically this is the PCIe card which suppose to talk
with GrandMaster by PTP.
I had small issue to assemble the Linux package for the most recent
Linux kernel (4.4.0). But eventually I did that.
UTC second.
Software would be easy to write, just output 60,000 numbers per second
to the port.
But if you already have a uP that can simulate WWVB why not just add a
little bit of code you read the tie of day over a serial port
On Wed, Nov 2, 2016 at 9:05 AM, Vlad <t...@patoka.org> wrote:
t; process running on my NTP machine
which push the WWVB through the soundcard.
Interesting ! Thanks again !
On 2016-11-02 13:35, Tom Van Baak wrote:
Hi Vlad,
There's lots of postings about this in the archives. For playing at
home I usually use a GPSDO/1PPS as the time reference and don't worry
I am wandering, if anybody seen the projects like WWVB simulation
(transmitter) using GPS/NTP/whatever as a time reference ?
I have something similar, which is generic PIC MCU with connected WWVB
antenna. This box generate WWVB signal for very short range. However its
handy for
There is good article to read
http://cs.stackexchange.com/questions/103/clock-synchronization-in-a-network-with-asymmetric-delays
Probably NTPD uses a weighting schema when processing the measurements.
However, beyond a certain level of delay the measurements are likely to
be so corrupted as
I am wandering if it will be the same results without 'FatPPS'. In my
Lab I was able to use T-Bolt 1PPS through TADD-3 (not from RS2323).
Works stable.
I am using 'chrony' though
210 Number of sources = 5
.- Number of sample points in measurement
set.
sting to see/compare if anybody else has similar stats.
Regards,
Vlad
On 2017-01-02 13:00, Tim Shoppa wrote:
What modern loads are actually sensitive to high (say, +10 to +20%)
line
voltage?
Old incandescent light bulbs were among the most sensitive loads in the
past (so much so, that 130V
nd then do averaging (simple shift to the right the big counter
value). Then it took this averaged value, translate it to main periods
and prints the results as [Period]
Regards,
Vlad
On 2017-01-03 11:41, Artek Manuals wrote:
Vlad
do you have that data for a longer period of time...say 3 t
cy: 49,849 Hz on tuesday, 17.01.2012, 23:02:08
Then I was curious if "leap second" event could be noticed on the main
frequency charts. May be its is no correlation at all.
Regards,
Vlad
On 2017-01-03 12:01, J wrote:
Power utilities tweak the system frequency on a daily basis to keep
On the image from LH, it says "no data from COM port". You probably need
to do some tweaks to make it works. May be USB2SERIAL is picky. Also it
worth to check the COM port settings.
I have similar StarLockII which works ok with current LH. The only
concern is device itself. For some
Some tools here, to see which NTP servers are announcing the event:
http://www.satsignal.eu/software/net.htm#NTPLeapTrace
For those who using Linux, the following shell command verifies that the
current 'timezone' file contains leap seconds and can be used with this
directive
#
d from NTP (and from this link https://uhr.ptb.de/).
Regards,
Vlad
On 2016-12-31 20:55, Magnus Danielson wrote:
Good evening David,
On 01/01/2017 02:27 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 1 January 2017 at 01:00, Magnus Danielson
<mag...@rubidium.dyndns.org>
wrote:
My video is there:
https://youtu.be/2hMy3XoNah4
I am wandering, if anybody else noticed that LH 5.0 watch is little
behind of some other relatively good time source ? On my video, you
could see my own NIXIE (driving by its own GPS receiver), my hand watch
(synched by WWVB), 'xclock' from
Here is some nice work which was done for DCF77, Its not the same as
WWVB, but worth to have a look how it was done.
http://endorphino.de/projects/electronics/timemanipulator/index_en.html
On 2017-01-04 14:29, paul swed wrote:
Simon
Like you I tend to like hardware. But today complete
I solved an issue connecting TBolt directly to the PCIe Serial Card.
Previously I was using DigiKey PortServer device. Strange that it was
working OK for long period of time.
May be some recent MS update did something for the driver. Will
investigate it later.
Now I could see the sat.
Hello Netizens,
After the power outage, my TB start to shows some strange behavior.
As I start LH, the screen shows like this (You could see the date stamp
as Dec 1997_
https://www.patoka.ca/OCXO/TBT0.png
Then, few seconds after, the date will be corrected
old* design. Since Vectron kept
building same / same
> (if you ordered it that way) who knows when it was built.
>
> Bob
>
>> On Oct 16, 2017, at 4:10 PM, Vlad <t...@patoka.org> wrote:
>>
>>
>> Hello,
>>
>> I am wandering if anybody observe the
Hello,
I am wandering if anybody observe the behavior for OCXO, when its stop
to reproduce the signal, and the only way to return it back to business
is little mechanical stress.
I have TWO of such OCXO. One of them is Austron 11.2 Mhz. And another
one is Vectron model 218Y4442 9.8304Mhz
RTC time: 13:00:00
# MCU time: 13:00:00
# MAIN time:13:00:01
The graph shows the "delta" between of RTC and MAIN.
On 2017-12-15 12:14, Jeremy Nichols wrote:
I'm surprised Vlad is seeing as much as six seconds differential but
maybe I don't understand the experiment. I've
I have one of my project boxes, which monitor the main freq. Here is
graph which reflect the time difference between of RTC (based on number
of pulses from OCXO) and the "MAIN TIME" which is based on number of
zero-cross events.
The observation period is 486 hours.
On 2017-12-14 23:13,
I had similar symptoms with LH and T-Bolt. The cause was the serial
port. As I change the serial port HW on computer site - T-Bolt was back
to track.
it was interesting enough that other devices was OK with initial Serial
port HW.
On 2017-12-19 17:20, Dan Rae wrote:
I've been trying to
Hello,
I am doing another fun project. It is data logger at this time. The
"heart" is MV89A OCXO and the "brain" is STM32.
"The box" has 1PPS input to control DAC which will control OCXO. BTW,
this M89A is pretty hot to touch. My other OCXO's not that much warmed.
Is it normal for this
The MV89 is a beast of an OCXO and uses more power at warm-up than any
other
I know of. But it is spec'ed ~1W for steady state. Which means the
outside of the OCXO should be about hand-warm. If it's too hot, then
the heater circuit is probably broken and running at full-throttle.
If so, I
On 2017-11-19 20:20, Mark Sims wrote:
Here are Wenzel's input circuits:
http://www.wenzel.com/documents/waveform.html
The TAPR TICC uses a slightly modified version of the two transistor
circuit.
Also check out the LPRO-101 manual for their versions of the single
CMOS gate squarer. One
Assuming the STM32 is set to trigger on the rising edge, a 2x output
will occur if there is bounce from a falling edge. Normally this is
not desirable, but there are cases where measuring both rising and
falling edge improves resolution. For example I have a version of the
picPET that
26.5837255
26.23559295
26.5941842
However, it is some "spikes" in the data flow (see above the number
"26.23559295", which suppose to be something as "26.58..."). I can't
understand the reason for that.
That's a software problem for sure. Do you use interrupts? Or some
library code for
For those of us who tend to use legacy, older products, perhaps spares
or surplus (time-nuts list members, and flight hardware designers
alike), this can present a problem. (Because *we* are also faced with
pressure to dispose of all that old paper and records, either from
cohabitants or
On 2018-01-19 14:31, Tom Van Baak wrote:
John's TADD-2-mini [1] uses the Wenzel sine-to-square converter. It
performs very well but requires +10 V.
I am using Wenzel approach without modification to drive it from +5V. I
didn't see any issues for my applications (usually it perform
ng, main, air, light, gravity, you-name-it...
Regards,
Vlad
On 2018-04-04 20:58, Mark Sims wrote:
I recently (mostly) finished adding external environmental sensor
support to Lady Heather. You can use the sensor as the primary
"receiver" device or in conjunction with any of the "re
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