I´m a long time time-nuts lurker (I posted here just a dozen times). I make
a few impedance measurement systems for material analysis (i´m a single man
shop doing custom hardware for clients). Usually they´re based around a
STM32F4 / F7 microprocessor: DAC generates sine signal (1-400KHz), ADCs
mea
Hi. I did a 15728640Hz signal locked to a 7680Hz reference using a
74hct9046. It was ugly (I mean, individual trimming of the resistors...
I assembled 20 boards). Circuit behaves more like a FLL than a PLL (if
you look at both with an scope they never quite locks to each other),
but it works
Yesterday hackaday had a link to a humidy sensor comparison:
http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html
Em 03/01/2017 16:03, Mark Sims escreveu:
I did a LOT of testing environmental sensors when I built my ultrasonic
anemometer weather station that is part of a rocket lau
A new interesting toy soon to be crowdsourced:
https://www.crowdsupply.com/amungo-navigation/nut4nt
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and follow the instructi
Hi, I opened a case with NXP to find application note "9397 750 00078"
about these chips. They sent me it together with some spreadsheets and a
design program. The spreadheets were for Lotus123 and the program for DOS :D
I converted them to xlsx and made a VM running FreeDOS with the design
the funtion of the chip in details
with many
examples:http://books.google.com/books/about/Phase_Locked_Loops_6_e_Design_Simulation.html?id=WjNy3RX9xcAC
73
Alex
On 4/29/2014 7:38 PM, Daniel Mendes wrote:
Hi... can you share you routine for designing with this chip? I tried
using it sometime
Only found info about PICTIC 1 and 2:
http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:pictic
Where´s info about PICTIC III?
Daniel
Em 13/05/2016 14:51, Attila Kinali escreveu:
On Fri, 13 May 2016 07:36:10 -0400
Bob Camp wrote:
Given that a “real” TDC is a resistor and capacitor
Quartzdyne makes pressure and temperature sensors for the oil industry
based on quartz xtals:
http://www.quartzdyne.com/quartz.html
Daniel
Em 13/03/2016 01:04, "jimlux" escreveu:
> On 3/12/16 7:35 AM, Bob Camp wrote:
>
>> Hi
>>
>> The conventional MCXO uses an AT cut crystal rather than an SC.
Lots of info here:
http://www.quartzdyne.com/white-papers.html
Em 16/03/2016 20:53, "Daniel Mendes" escreveu:
> Quartzdyne makes pressure and temperature sensors for the oil industry
> based on quartz xtals:
>
> http://www.quartzdyne.com/quartz.html
>
> Daniel
&g
my 2 cents:
1) hack a RC delay + comparator (isolate well the R and C for temp
variations)
2) use a proper delay line (can be bought at digikey/mouser/etc)
Daniel
Em 24/11/2015 12:04, Thomas Allgeier escreveu:
Hello,
I have an ACAM GP22 TDC chip and evaluation board which I am looking at
Very nice... thank you!
Daniel
Em 28/10/2015 19:53, Dr. David Kirkby (Kirkby Microwave Ltd) escreveu:
Unlike the USA, the UK has just one grid. Someone pointed this out to me,
which looks an interesting visual display
http://www.gridwatch.templar.co.uk/
but there are links to the raw histori
Ok... time to show my lack of knowledge in public and ask a very simple
question:
Can someone explain in very simple terms what this graph means?
My current interpretation is as following:
"For a 100Hz input, if you look to your signal in 0.1s intervals,
there´s about 1.0e-11 frequency erro
From time to time this subject rises again, so i´m sending these links:
http://www.electronics-eetimes.com/en/kickstarter-project-offers-indoor-positioning-on-arduino.html?cmp_id=7&news_id=222924926&vID=209
http://analog-eetimes.com/en/cmos-chip-enables-real-time-location-with-a-precision-of--10
Thanks all for your info about these modules.
Daniel
On 26/04/2015 01:26, Bill Byrom wrote:
I still work for Tektronix, but not in Service or the sampling scope
product line. I'm a Tektronix field RF Application Engineer.
You can find the service manual for the SD-24 at:
http://www.tek.com/osc
Does anybody in this group has any info about Tektronix sample heads
like SD26? I´d like schematics, or at least a pinout of the
centronix-like interface. My google-fu failed me (got only a service
manual that says nothing).
Thanks
Daniel
___
time
On 07/04/2015 17:58, Hal Murray wrote:
If you are happy with Raspberry Pi or BeagleBone Black, they are the
low cost low power way to go. They run Linux. They don't have a real
disk. If you do a lot of "disk" activity, you might wear out the SD
card frequently enough to be annoying. That hasn
Internally the rPI is a ver awkward beast: the CPU is connected to a
GPU, and the GPU is connected to the GPIOs... so lots of jitter and latency.
It was designed to be a video decoder... the CPU is there for testing
and housekeeping. It works, surelly, but it´s not designed to have low
laten
I think beagle bone black is the answer to this question (because rPi
has a USB<->network interface that´s problematic) but i´ll let others
that know more than me about this specific subject follow on
Daniel
On 06/04/2015 19:29, Frank Hughes via time-nuts wrote:
Hi,Years ago this forum he
There´s an entire programable CPU inside it... amazing.
Daniel
On 20/03/2015 22:59, Angus wrote:
Oops, I wasn't paying attention when I looked at the GP30 info - like
Maxim, Acam has gone down the 'more integration' route and buried the
actual TDC under a heap of other stuff, which does rather
On 20/03/2015 04:01, Hal Murray wrote:
It would be fun to make a ring with no inverters, inject a pulse, and
watch to see how long it lasts. I'll bet there is matastability type
math that depends on the width of the pulse. If you get the width
exactly right it will last a long time. Too long
On 28/02/2015 16:58, Charles Steinmetz wrote:
Daniel wrote:
I designed a board with an OCXO, pic microcontroller, power supply,
mains interface with optocoupler, and SD card for data
collection..* * * The boards also have a small Li-Ion
battery and battery charger for short power
power fails, oscillator drift, etc.).
Surelly... I must first discover how well (or how badly) it works
Here's one from a couple years ago, between two cities, and two states.
http://leapsecond.com/pages/mains-cv/
Thanks for the link!
Daniel
/tvb
- Original Message -----
Fro
I´m planning an experiment like that... I designed a board with an OCXO,
pic microcontroller, power supply, mains interface with optocoupler, and
SD card for data collection.. I plan to sincronize a counter running at
10MHz between them and log events at 5 different points in my city. The
boa
Initial datasheet:
http://www.ti.com/lit/ds/symlink/tdc7200.pdf
EVM:
http://www.ti.com/tool/tdc1000-tdc7200evm
Seems good... what do you think?
Daniel
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I tried something like that once just to discover that the OCXO VFC port
had low impedance, so my voltage divider didn´t behave very well. So i
put an amp op in unitary gain configuration between the two and things
improved a lot. Then I changed the amp op for a DP precision part and
things i
Today I got an email about this:
http://www.ti.com/tool/prucape?keyMatch=PRU%20cape&tisearch=Search-EN
And from there I found this:
http://processors.wiki.ti.com/index.php/PRU_Cape_Getting_Started_Guide
Hope it helps some fellow nuts in their quest for the ultimate
precision/price ratio achie
You beat me :)
http://www.potatosemi.com/
They sell low quantities thru Ebay, like this:
http://www.ebay.com/itm/7400-G-Series-GHz-TTL-CMOS-logic-IC-14pin-SOIC-QTY-1-/330772425575?pt=LH_DefaultDomain_0&hash=item4d0392ab67
Daniel
On 15/10/2014 21:02, Bert Kehren via time-nuts wrote:
Take a
Maybe a paypal donnation button could offset some of this cost.
Daniel
Em 28/09/2014 15:18, "Didier Juges" escreveu:
> Francesco,
>
> Thanks for the offer. I have been a Linux user since Slackware with the
> 1.0.9 kernel. I know just enough to be really dangerous to myself,
> hopefully not to ot
es with my time-nuttery clocks, at least to
the eye.
Only appears in one place in the registry, unambiguous.
Cheers,
Don
Daniel Mendes
This probably ends in the registry somewere... type some random garbage,
save, and seach the registry for this string... then edit the registry
to put the correct
This probably ends in the registry somewere... type some random garbage,
save, and seach the registry for this string... then edit the registry
to put the correct url there. Or use a url shortener service
Daniel
Em 13/07/2014 17:18, Don Latham escreveu:
Whee! Chris: the text box in the
Em 02/07/2014 05:04, Hal Murray escreveu:
If you want to go farther or faster, it's probably wise to shift to
differential signaling.
This. always use 485/422 drivers (2 pairs, one in each direction) + 1
pair for VCC + 1 pair for GND in a CAT-5 cable. If you are carefull you
can choose the pi
Sometime ago pleople here talked about using the PRU´s (two cores with
predictable timing) inside the Beaglebone´s main chip to make time
measurements. Today I found this article that points to more data about
programming the PRUs, even in C:
http://hackaday.com/2014/06/22/an-introduction-to
The datasheet can be easily found with google. The functionality is very
simple, it could be emulated with a CPLD+small memory or with an small
FPGA (maybe the newer CPLDs from Altera.. they are FPGAs inside... and I
think they have block RAM). But if you can still buy it in another
package i
Em 30/04/2014 13:38, Magnus Danielson escreveu:
Alex,
You should direct your comments to Samuel that is doing a design.
He replied to me because I also asked a question about the 74HCT9046A.
I know very well about keeping the comparator frequency high, and that
the 9045 may not be the idea
Hi... can you share you routine for designing with this chip? I tried
using it sometime ago but the results didn´t agree much with what I
designed, so i gave up (for now... but i´ll return to it :)
Also in the datasheet it says:
13.3 Further information
For an extensive description and appli
Em 13/03/2014 01:35, Bob Stewart escreveu:
Hi Daniel,
re: FIR vs IIR
I'm not a DSP professional, though I do have an old Smiths, and I've read some
of it. So, could you give me some idea what the FIR vs IIR question means on a
practical level for this application? I can see that the MA is
This is a FIR x IIR question...
moving average = FIR filter with all N coeficients equalling 1/N
exponential average = using a simple rule to make an IIR filter
Daniel
Em 13/03/2014 00:55, Bob Stewart escreveu:
Hal says: "For exponential smoothing, a_avg will be a fraction. Let's pick a_avg
Em 05/03/2014 22:43, Didier Juges escreveu:
Tom and Bob,
It is not obvious to me that it is "easier" to simply apply a correction in
nS increments with a range as wide as 100nS. How is this done? Using
switched delay lines or delay gates?
Using a DS1023 or a DS1124 plus a microcontroller to rec
Uncorrelated noise improves resolution in certain systems, even
mechanical ones... it´s called dither:
http://en.wikipedia.org/wiki/Dither
Daniel
Em 03/03/2014 11:35, Poul-Henning Kamp escreveu:
In message <107931.7dbf8887.4045e...@aol.com>, gandal...@aol.com writes:
I realise the interna
We should have a "Broadband Time-nuts" for this sort of thing. This
topic is also of interest to me, and I have good pointers to give about
how to implement it with minimum effort, but as the owner asked it to
stop before I could reply i´m keeping quiet :)
Daniel
Em 02/03/2014 19:09, John M
This is a different breed of time nuttery than usual in this list but i
think that at least some of you will enjoy it:
http://www.behance.net/gallery/FLUX-1440/2420150
Found it at hack a day
Daniel
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This one is very good, i have assembled it myself:
http://www.dextrel.net/diyzerocrosser.htm
Works very well with a very big voltage range, and it´s isolated. Only
disadvantage is that it generates 120Hz output, but I think you can
easily change that (turning the bridge rectifier into a half-
http://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver
Has anyone seen this? Any time-nuts utility?
Daniel
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That´s a big problem. To go sub-100ns you must make frequency > 10Mhz,
and most of these chips only run at >10MHz using internal PLLs (you
can´t directly clock them with more than about 20MHz.. or at least the
datasheet says so).
A FPGA has no such problems (or at least they are very atenuat
They have a page about it... it´s very convoluted (at least for me, for
whom english is not the first language). It boils to "we ship
internationally but only for a short list of countries (mine not
included, unfortunately):
http://www.goldmine-elec-products.com/Testimonials.asp
*Merchandi
It´s still used in the oil industry as "the standard" for temp and
pressure monitoring...
Daniel
Em 09/12/2013 10:28, Bob Camp escreveu:
Hi
The Quartz Thermometer died when somebody proved that hysteresis was a big deal
on the probes.
Bob
On Dec 8, 2013, at 11:22 PM, Tim Shoppa wrote:
Em 19/11/2013 09:31, Poul-Henning Kamp escreveu:
In theory harmonic distortion does not change your zero-crossings,
The odd ones doesn´t, but the even ones do... and they happen.
Daniel
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Ok... maybe i´ll make a not so smart question but... if the MV89 is bad,
what´s the recomended parts from ebay for something like that? (10MHz
OCXO to upgrade some sort of equipment)
(I´m asking because I did almost the same thing than our friend Hagar...
I noticed that the MV89 wasn´t as go
It could be... It' s not hard to add nop's so that the detection always
takes the slowest possible time (but deterministic, or near).
Em 16/09/2013 20:36, "Mark Sims" escreveu:
> The AS3935 chip has a DSP on it that is doing a lot of statistical
> analysis. It only draws a few microamps, so it
This is true, but what´s needed to generate the sync packets? I think
they call them "Grand Masters", and cost a lot of money... Is there any
cheap approach for this end of the problem?
Daniel
Em 31/07/2013 08:03, Bob Camp escreveu:
Hi
A number of the chip guys will sell you micro's that h
What about the master reference? Is there any cheap implementation yet?
Daniel
Em 06/06/2013 21:48, Bob Camp escreveu:
Hi
1588 compatible network cards are capable of time stamping everything that goes
in and out. They are pretty common these days both as stand alone cards and as
peripheral
s site: command
with the model # like this:
site:www.hpl.hp.com/hpjournal 83481a
Ed
On 3/29/2013 2:09 PM, Daniel Mendes wrote:
Em 29/03/2013 12:26, paul swed escreveu:
If the schematics are available then you can reverse engineer a
solution or
adaptation.
the other thing I do is hunt down the
Em 29/03/2013 12:26, paul swed escreveu:
If the schematics are available then you can reverse engineer a solution or
adaptation.
the other thing I do is hunt down the hp journal for the device that used
them and when it was introduced. Often the article will give you a fair
hint as to whats going
Looking at e-pay (nobody here seems to refer to it by it´s name... don´t
know why.. any relationship to Sauron?) I found several items from HP
named "samplers", like:
http://www.ebay.com/itm/Agilent-5086-7961-Sampler-50GHz-/120789801136
http://www.ebay.com/itm/HP-Agilent-5340A-Microwave-Sample
ating
and decelerating. Welcome to the interesting world of time & frequency, even at
60 Hz.
/tvb (iPhone4)
On Feb 28, 2013, at 10:42 AM, Daniel Mendes wrote:
Em 28/02/2013 13:37, Tom Van Baak escreveu:
Daniel,
I've placed two log files for you under http://leapsecond.com/pages/mains/
log19
Em 28/02/2013 13:37, Tom Van Baak escreveu:
Daniel,
I've placed two log files for you under http://leapsecond.com/pages/mains/
log1932.dat.gz -- timing of every 60 Hz zero-crossing (1.296 million samples)
log97312.dat.gz -- timing of every 60th zero-crossing (21.6 thousand samples)
Each repres
Thanks for all the comments about this topic. They are much appreciated.
About the difficulty of measuring every cycle with a conventional
counter... thanks for that info, seems that i´ll have to make my own
measurement hardware. I liked the idea of a time stamping counter
it´s very doabl
-cycle
variations in the generator frequency.
Are you looking for cycle swing when the load changes?
Or is it a matter of wanting to because you should be able to?
Which, of course, is a great reason for doing all sorts of things!
-Chuck Harris
Daniel Mendes wrote:
Hi, I have a Picotest U6200A
Hi, I have a Picotest U6200A. I´m trying to log the grid frequency
(60Hz) to generate data for my work. I need to get data from every
cycle. I setup their program (it always starts in chinese... very funny)
but seems that it can only log every 100ms. Questions:
1) Is that a limitation of the
Seems that you need windows, so you need x86. I would go with some
miniITX with Atom or AMD E-350.
A datapoint: I have 2 netbooks (don´t ask me why). One has an atom Z520
@ 1.33GHz. The other has an AMD E-350 dual core @1.6GHz. The Atom is a
pile of crap. The AMD is very useable.
There are
er files about YIGs. I zipped
them and put them on Mediafire. Help yourself.
http://www.mediafire.com/download.php?6v0db7crbkbb943
Ed
On 1/4/2013 8:19 AM, Daniel Mendes wrote:
Hi, maybe this topic is a bit boundary for this list, but i´ll just
ask for general directions
I´ve disco
Em 04/01/2013 15:45, Lizeth Norman escreveu:
Daniel,
Another place to go is's site. He's got lots of good info on the
stellex ones as well as controlling them with the rf synthesizer that
can be had on that conspicuous auction place.
This was the first site I found with detailed info abou how t
Em 04/01/2013 13:44, J. Forster escreveu:
Most modern books on micriowave design (and probably Wiki) have the
basics. They are based on the NMR principle (Nuclear Magnetic Resonance).
This is the same physics used in MRI.
You might also look at old issues of the HP Journal or the Watkins-Johnson
have been at least a couple of articles on YIG modules in VHF
Comms magazine
Alan G3NYK
- Original Message - From: "Daniel Mendes"
To: "Discussion of precise time and frequency measurement"
Sent: Friday, January 04, 2013 2:19 PM
Subject: [time-nuts] YIG oscillator
Hi, maybe this topic is a bit boundary for this list, but i´ll just ask
for general directions
I´ve discovered these wonderfull bits of hardware called YIG (Yttrium
iron garnet) Oscillators (and filters!) in Ebay. If someone doesn´t know
what i´m talking about, they are very broadband t
Found the magazine´s site:
http://www.siliconchip.com.au/Issue/2012/December
You can look at the first pages of the article without paying.
Daniel
Em 27/12/2012 17:12, Paul Amaranth escreveu:
Did anyone see the article in the December Silicon Chips magazine about
building a 12 digit 2.5 GHz
Like this?
http://www.ebay.com/itm/Tektronix-Delay-Line-for-475-Oscilloscope-New-/290824098279?pt=LH_DefaultDomain_0&hash=item43b67791e7
Em 17/12/2012 23:39, David escreveu:
I wish there was an source for helically wound shielded differential
transmission line like the type used in later analo
At this interest rate you´ll sell more units than Apple will sell Iphone
5´s... ;)
Daniel
Em 19/11/2012 18:15, cdel...@juno.com escreveu:
As Bert mentioned once the amount if interest is established purchase
details will post.
We also will post a FAQ for this project.
Thanks,
Corby
__
Sign me in too...
Daniel
Em 19/11/2012 17:57, Volker Esper escreveu:
I'd like to be on the list. Definitely. Where do I have to pay?
Volker
Am 19.11.2012 20:04, schrieb cdel...@juno.com:
"MINI-TIC" for DMTD work
Hi Everyone!
I've been testing a Miniature 2 channel TIC that Bert Kehren
About replacing the 74ACT175... there´s a company called "Potato Semi"
(well.. they make "chips", right?) whose sole business is to make damn
fast 74 logic. Their chips can be bought at ebay in small quantities.
Look at this 600MHz D flip flop:
http://www.potatosemi.com/potatosemiweb/datashe
All this talk about microcontrollers and IEEE1588 made me get out of the
shadow to ask:
1) Are you talking about IEEE1588-2002 or IEEE1588-2008? The former has
no use to me, but the later could replace some GPSs in a system i´m
designing...
2) If you intend to play with IEEE1588-2008, do you
I would buy some. I´m in Brazil, but I can pay with Paypal...
Daniel
-
I could handle such a group buy. How many people would be interested?
The price breaks u-blox has are IIRC 1-50, 50-100,... Attila Kinali
-- Why does it take years to find the answers to the questions
find that the English versions do no always contain the circuit
diagrams .in this case download the German language version which will
have the circuits at the back
Alan G3NYK
- Original Message -
From: "Daniel Mendes"
To:
Sent: Wednesday, December 07, 2011 6:43 PM
Subjec
Hi, i´ve got a hameg HM8123 that came without any front panel button
working. Opening it i found that both flat cables from the panel to the
mainboard got loose. I figured where to plug the fist one (because it
could only plug in one connector... it was a tight fit) but the other
can be plugge
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Daniel Mendes
> > Sent: Friday, December 26, 2008 3:04 PM
> > To: time-nuts@febo.com
> > Subject: [time-nuts] Request for MC598X4 and Datum LPRO datasheet
> >
> > Hy, my name is Daniel, I lurk at t
Hy, my name is Daniel, I lurk at this list trying to learn something
with the masters of time measurements :) I´ve bought two MC598X4 from
Ebay. Does someone have a datasheet for them? Or at least the pinouts...
I´ve bought also an Datum LPRO 102500-001 but the datasheet is no more
available at
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