[time-nuts] Help improving impedance measurement by having a better clock

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

Re: [time-nuts] PLL performance?

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

Re: [time-nuts] Temperature (environmental) sensors

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

[time-nuts] NUT4NT: Four-channel All-frequency GNSS RF-to-Bits

A new interesting toy soon to be crowdsourced: https://www.crowdsupply.com/amungo-navigation/nut4nt ___ 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

[time-nuts] Info about 74hct4046 and 74hct9046

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

Re: [time-nuts] 74HCT9046A Max. Operating Frequency

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

Re: [time-nuts] Microchip PIC CTMU

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

Re: [time-nuts] quartz thermometers

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

Re: [time-nuts] quartz thermometers

Lots of info here: http://www.quartzdyne.com/white-papers.html Em 16/03/2016 20:53, "Daniel Mendes" <dmend...@gmail.com> escreveu: > Quartzdyne makes pressure and temperature sensors for the oil industry > based on quartz xtals: > > http://www.quartzdyne.com/quart

Re: [time-nuts] ACAM GP22 Chip

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

Re: [time-nuts] Historical frequency data of UK grid

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

Re: [time-nuts] Modified Allan Deviation and counter averaging

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

[time-nuts] Indoor positioning

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=7news_id=222924926vID=209

Re: [time-nuts] Tektronix Sample Heads

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:

[time-nuts] Tektronix Sample Heads

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 ___

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

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

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

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

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

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

Re: [time-nuts] Harmonics suppression in ring oscillators

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

Re: [time-nuts] new tdc from Texas

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

Re: [time-nuts] Recording mains frequency/phase [WAS: No GPSsatellites]

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 - From: Daniel

Re: [time-nuts] Recording mains frequency

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

Re: [time-nuts] Recording mains frequency/phase [WAS: No GPS satellites]

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

[time-nuts] new tdc from Texas

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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] VC-OCXO EFC stability.

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

[time-nuts] TI PRU info

Today I got an email about this: http://www.ti.com/tool/prucape?keyMatch=PRU%20capetisearch=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

Re: [time-nuts] Digital Mixing with a BeagleBone Black and D Flip Flop

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_0hash=item4d0392ab67 Daniel On 15/10/2014 21:02, Bert Kehren via time-nuts wrote: Take a

Re: [time-nuts] KO4BB.com

Maybe a paypal donnation button could offset some of this cost. Daniel Em 28/09/2014 15:18, Didier Juges shali...@gmail.com 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,

Re: [time-nuts] Setting Windows XP clock.

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

Re: [time-nuts] Setting Windows XP clock.

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 url

Re: [time-nuts] FASTRAX GPS

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

[time-nuts] Beaglebone´s PRUs

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:

Re: [time-nuts] Datum 4065A Cs Tube Response

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

Re: [time-nuts] 74HCT9046A Max. Operating Frequency

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

Re: [time-nuts] 74HCT9046A Max. Operating Frequency

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

Re: [time-nuts] PLL Math Question

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

Re: [time-nuts] PLL Math Question

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

Re: [time-nuts] Another atomic clock question

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

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

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 internal

Re: [time-nuts] 5370 controller topics (was: processor boards available)

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

[time-nuts] Different breed of time nuttery

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 ___ time-nuts mailing list --

Re: [time-nuts] Line Frequency

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

[time-nuts] high (spacial) precision GPS in Kickstarter

http://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver Has anyone seen this? Any time-nuts utility? Daniel ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)

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

Re: [time-nuts] Motorola GPS antenna type GCNT20A3A

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

Re: [time-nuts] temperature

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

Re: [time-nuts] Mains frequency

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 ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Morion MV89 and LTC6957

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

Re: [time-nuts] Lightning Strike Site, Latency of AS3935 IRQ output

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 hol...@hotmail.com escreveu: The AS3935 chip has a DSP on it that is doing a lot of statistical analysis. It only draws a few

Re: [time-nuts] Industrial control systems and IEEE 1588v2 time sync

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

Re: [time-nuts] Net4501

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

Re: [time-nuts] Question about samplers

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 hp journal

[time-nuts] Question about samplers

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

Re: [time-nuts] Question about samplers

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

Re: [time-nuts] Logging the grid frequency....

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

Re: [time-nuts] Logging the grid frequency....

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

Re: [time-nuts] Logging the grid frequency....

. Welcome to the interesting world of time frequency, even at 60 Hz. /tvb (iPhone4) On Feb 28, 2013, at 10:42 AM, Daniel Mendes dmend...@gmail.com 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/ log1932

[time-nuts] Logging the grid frequency....

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

Re: [time-nuts] Logging the grid frequency....

-by-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

Re: [time-nuts] YIG oscillators

but there have been at least a couple of articles on YIG modules in VHF Comms magazine Alan G3NYK - Original Message - From: Daniel Mendes dmend...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, January 04, 2013 2:19 PM Subject: [time-nuts] YIG

Re: [time-nuts] YIG oscillators

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

[time-nuts] YIG oscillators

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

Re: [time-nuts] 2.5 Ghz 12 digit counter project

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

Re: [time-nuts] Comparing PPS from 2 GPS units

Like this? http://www.ebay.com/itm/Tektronix-Delay-Line-for-475-Oscilloscope-New-/290824098279?pt=LH_DefaultDomain_0hash=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

Re: [time-nuts] Nifty MINI TIC for DMTD work

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

Re: [time-nuts] Nifty MINI TIC for DMTD work

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

Re: [time-nuts] PICTIC II ready-made?

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:

[time-nuts] IEEE1588

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

[time-nuts] Building a GPSDO trouble using Jupiter-T

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

Re: [time-nuts] Help with HAMEG HM8123

Maybe i´m blind but at the Hameg site I can only find one PDF with the manual in 4 different languages together (english, spanish, german and french) but no schematics... Daniel Date: Wed, 7 Dec 2011 19:52:58 - From: Alan Meliaalan.me...@btinternet.com To: Discussion of precise time and

[time-nuts] Help with HAMEG HM8123

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

[time-nuts] Request for MC598X4 and Datum LPRO datasheet

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

Re: [time-nuts] Request for MC598X4 and Datum LPRO datasheet

-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 this list trying to learn something with the masters