Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

A shield will definitely help with differential mode noise (the USB communication signal) but has little effect on common mode noise (the digital stuff coming from other parts of the circuit), a choke is the fix for common mode (if you can't get rid of the noise at the source, or otherwise return

Re: [time-nuts] Setting correct date on Trimble Thunderbolt receiver

Tom, In my TB monitor kit, I used your Julian date routines, adapted to the 8051 (no variable greater than 32 bits since my compiler does not support them either) to apply the GPS offset correction. It was very helpful. Didier KO4BB On Wed, Mar 28, 2018, 7:13 AM Tom Van Baak

Re: [time-nuts] Recommendations for Mains Power Monitor / Logger

I like the sound card idea. However I believe it's much better to use the two channels. At least under Windows, it is much easier to track the relative phase of the two channels of one sound card than the absolute phase of one channel compared to the system clock. I have written an audio VNA in

Re: [time-nuts] Replacement A9 boards for the HP 5065A

It depends on the quantity they buy. I just looked for X7R 0.1uF in 0805 at Digikey and the automotive grade (10%, -55 to +125) is cheaper than the non automotive grade with worse tolerance and more limited temperature range. Next time you buy it may be reversed... On Feb 25, 2018 1:51 PM,

Re: [time-nuts] Furuno GT-8031 breakout board

Got the answer in the previous email :) On Mon, Feb 19, 2018 at 5:28 PM Didier Juges <shali...@gmail.com> wrote: > What do you mean by “Adafruit” pinout? > > On Fri, Feb 16, 2018 at 11:50 AM Mark Sims <hol...@hotmail.com> wrote: > >> No, the Tbolt does not have a s

Re: [time-nuts] Furuno GT-8031 breakout board

What do you mean by “Adafruit” pinout? On Fri, Feb 16, 2018 at 11:50 AM Mark Sims wrote: > No, the Tbolt does not have a separate receiver board... plus its' GPS is > rather special... the RF chain is locked to the OCXO so it does not produce > any sawtooth error. > > The

Re: [time-nuts] On the IETF leap-seconds.list SHA1

I am so glad that my laziness has a new name that does not sound nearly as bad as the original one... I will be sure to remember that next time I do my "self appraisal". Merry Christmas everyone (I know I am early but my clock is fast...) Didier KO4BB On Thu, Dec 21, 2017 at 2:08 AM, Mike

Re: [time-nuts] Oscilloquartz 8600-3 Disassembly pictures...

You are always welcome to upload time-nuts related material to my manual site www.ko4bb.com Didier KO4BB On Dec 14, 2017 1:03 AM, "Ulf Kylenfall via time-nuts" wrote: > > Tried to mail the pictures to Magnus. The mail bounced back. > Ole Petter Ronningen was kind to also

Re: [time-nuts] Weird GPSDO behavior

Where I work, we had a high power system tripping and occasionally blowing up at 7:00 AM. It turned out that it was when the power company switched big capacitors across the lines as businesses got started to keep the power factor within their target range. It was creating just the kind of

Re: [time-nuts] Weird GPSDO behavior

It makes me feel better (not good, just better) to know it's not just me... On Sep 29, 2017 7:19 AM, "Bob kb8tq" wrote: > Hi > > > > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > > > I suspect that it is either temperature related (the funkiness starts >

[time-nuts] KO4BB Manual Pages

News flash! If you have been using my site to upload and download manuals, you may have noticed that in the last year or so I had become fairly slow at checking new uploads and moving them to the general area so that they can be downloaded. The reasons were multiple and I want to take this

Re: [time-nuts] Thunderbolt question

"If the Thunderbolt loses satellites, does it still put out a 10 Mhz signal?" Yes of course. When that happens, the Thunderbolt is said to be in holdover. On Aug 3, 2017 9:29 PM, "Chris Waldrup" wrote: > Hi, > > I just noticed the laptop that is always connected to my

Re: [time-nuts] Thunderbolt - trouble locking with some types of antennas

" having around 20 dB of gain at the antenna greatly decreases the effect of feed line loss on noise figure." And that would be consistent with usage for a timing receiver which is expected to have a well exposed antenna and a significant line length, as opposed to navigation receivers where the

Re: [time-nuts] Thunderbolt - trouble locking with some types of antennas

Hi > > > On Jul 31, 2017, at 3:32 PM, Didier Juges <shali...@gmail.com> wrote: > > > > The Thunderbolt is well known for not having the best sensitivity among > GPS > > receivers. It seems that timing receivers in general, particularly those > of >

Re: [time-nuts] Thunderbolt - trouble locking with some types of antennas

The Thunderbolt is well known for not having the best sensitivity among GPS receivers. It seems that timing receivers in general, particularly those of the same generation as the Thunderbolt are not as sensitive as navigation (possibly newer) GPS receivers. It may be because they are expected to

Re: [time-nuts] A look inside the DS3231

That device also has analog circuitry for the oscillator itself and the temperature sensor and the temperature compensation. I believe I have read an app note some time ago, it may have been from Maxim describing a kind of ring oscillator being used as a temperature sensor which drew much less

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

Since the Thunderbolt is hard coded to detect a particular week to determine if it should add 1024 to the week number, I would guess that each product has a magic date based on the anticipated release date of the product (week 936 for the Thunderbolt), and it will work for 1024 weeks from that

Re: [time-nuts] 5370B Input Board Repair [WAS: 5370B Question / help needed]

That is very good information. I will add your email to the 5370 page on my web site. Didier KO4BB On Jul 18, 2017 4:02 AM, "Thomas Allgeier" wrote: > Hello All Again, > > > > I’ve got my 5370B going now and in the process made a “discovery” which I > thought might be

Re: [time-nuts] Power connectors continued

I have been forced to use micro-D by a customer on a military power supply, not even space rated, it was well over $100 each in 50 piece quantity (I think it was a 25 pin). However, unless they are mistreated (which is easy for the reason you listed), they seem reliable. I do not believe we have

Re: [time-nuts] GPS Antenna on Tower.

If that is not time-nutty, I do not know what will :) On Jun 20, 2017 7:04 AM, "jimlux" wrote: > > for geodetic measurements, they drill a hole down to bedrock, and run a > pipe down to anchor the antenna to the bedrock. > > "All holes shall be drilled straight enough so

Re: [time-nuts] backfill (was: Poor man's oven)

The difficulty with hydrogen is to keep it where you want it. It does not take very much for it to leak out (or in, as the case may be) On Jun 8, 2017 4:58 PM, "Alan Melia" wrote: > Hi Bob, it also depends on what you allow to leak into the vacuum. > Hydrogen is a

Re: [time-nuts] uC ADC resolution (was: Poor man's oven)

The good news is that for oven control, you can typically filter the heck out of the data and the noise may actually help you with dithering if it's fairly random, so you should be able to get close to the specs. The main thing you need is stability, linearity should not be a factor. One

Re: [time-nuts] Line Frequency standard change - Possible ?

One issue with power factor corrected power supplies is that in the short term (as a minimum, at the line frequency), they do behave like resistors (current goes up when voltage goes up) but as they have a slow voltage regulation loop to provide regulated output, they do behave like constant power

Re: [time-nuts] Dropbox is cool, but...

Yes, I noticed that before. I have a number of tools that don't like running off a Dropbox folder, including several software development tools for starter. Too many files opened at the same time. Don't assume that because it looks like a normal folder, it works like one, even though for many

Re: [time-nuts] Li-ion Battreries

Well worth mentioning that you have found a reputable vendor. I may give them a try. A while back, I bought a dozen 18650 inexpensive(<$5 each) cells from 3 vendors picked at semi-random on eBay (4 from each) for evaluation and I tested each one of them with a data logger. The best one had about

Re: [time-nuts] OT: Eagle PC CAD now Autodesk, $500/year

I use Copper Connection, a $50 package (PWB layout only) that works very well for me. There is a free eval version that has some limitations. Didier KO4BB On Jan 19, 2017 11:01 PM, "Richard (Rick) Karlquist" wrote: > Off topic, but probably a lot of disgrunted Eagle

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

I have C code (for the 8051) that is simply the translation of what's in the app note. It does temperature and humidity but not the barometric pressure (no double precision float on that compiler). Works exactly as advertised. I have two. You can see one in action here:

Re: [time-nuts] HP53132A Firmware Version 4613

Hopefully that will be tomorrow. Didier KO4BB On December 27, 2016 2:37:23 PM CST, GandalfG8--- via time-nuts wrote: >I have just uploaded this firmware to Didier's (KO4BB) manuals site so >it >should be available for download in the near future. > >Regards > >Nigel

Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?

TCXO usually refers to Temperature Compensated Crystal Oscillator (no heater), as opposed to Oven Controlled Crystal Oscillator (OCXO) which has an oven. I would not expect a TCXO to become warm or draw more current at power up. An OCXO would. Didier KO4BB On December 21, 2016 1:29:00 PM CST,

Re: [time-nuts] OT: ExpressPCB (cross-post from volts-nuts)

There is a free tool (Robot Room Copper Connection) that will take EcpressPCB files and spit Gerber files. It is actually a full fledged PCB design software that seems to be significantly more capable than the ExpressPCB software even though I have not used it as such. Alternately you can

Re: [time-nuts] Oscilloquartz Star-4 GPSDO (was: Thermal impact on OCXO)

Re: Manual uploads to my site: I have limited internet access for another week. Uploads will be processed the week of December 5th. Didier KO4BB On November 19, 2016 7:05:52 PM GMT+01:00, Mark Sims wrote: >There was a copy uploaded to EEVBLOG. I uploaded it and another

Re: [time-nuts] HP 59309A Clock runs, sets via GPIB, but no GPIB output?

I am out of town but will be back over the week end. All uploads will be sorted by then. Didier KO4BB On October 11, 2016 1:54:06 PM EDT, Francesco Messineo wrote: >1818-2295A dump has been uploaded to ko4bb site, probably there's need >to be moved in the right

Re: [time-nuts] Prologix USB-GPIB Controller

I buy a lot of stuff from eBay and Amazon, including batteries on occasion. Invariably, there has been a pretty good correlation between price and quality, but considerably more so with batteries. It really sucks paying $100 or more for a quality OEM laptop battery, but the alternative is to

Re: [time-nuts] Speaking clock

I would like to find an emulator of the old voice synthesizer used in the Atlanta airport subway. "The next stop is concourse A. The color coded maps in this vehicle match the station colors." "This vehicle is leaving the station, please hold on." They replaced it in 1996 for the Olympics but I

Re: [time-nuts] GPSDO - probably a stupid question.

In fact, you do not want to "update the crystal one million times/second". The whole point of a GPSDO is to combine the excellent short term stability of the crystal with the excellent long term stability of the GPS signal. If you update the crystal in real time from the GPS data, you do not need

Re: [time-nuts] Mini ovens packaging

If you have to regulate over ambient temperature as high as 120C, you need an oven that regulates at a higher temperature, maybe 125 at least or 130C. You will have a lot of issues with long term reliability with something that operates 24/7 above 120C. Have you looked at a Peltier junction that

Re: [time-nuts] Working with SMT parts.

I did not know Futurlec accepted ExpressPCB files, so I checked. The equivalent to ExpressPCB mini board pro service (2 sided, solder mask and silk screen, 3 pieces, same size) is $86 + shipping and one week to shipment. ExpressPCB is $75 in 3-4 days in your mailbox including FedEx (they do offer

Re: [time-nuts] Working with SMT parts.

gt;GERBER files as a selection. However he charges for the program but it > >seems the prices are reasonable ( >http://www.robotroom.com/CopperConnection/Buy.html ). > >73BillWB6BNQ > > >Didier Juges wrote: > >>The way ExpressPCB works is that their free software p

Re: [time-nuts] Working with SMT parts.

x.html ) > >It is a bit more involved than the ExpressPCB program and does have >GERBER files as a selection. However he charges for the program but it > >seems the prices are reasonable ( >http://www.robotroom.com/CopperConnection/Buy.html ). > >73BillWB6BNQ > >

Re: [time-nuts] Working with SMT parts.

But it is totally >non-standard and you can't use it for anything other then for their >service. Most people needing free PCB software use Eagle, some use >Kicad or some others. But Eagle seems to be kind of a universal >standard. > > > > >On Thu, Aug 11, 2016 at 8:55 AM, D

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

to the other? >Bob > - >AE6RV.com > >GFS GPSDO list: >groups.yahoo.com/neo/groups/GFS-GPSDOs/info > > From: Didier Juges <shali...@gmail.com> >To: Bob Albert <bob91...@yahoo.com>; Discussion of

Re: [time-nuts] Safely getting the electrical length of a connectedantenna feedline

matching > >I'm guessing a mobile spell checker changed his " id= " to " I'd= " >(even though it was part of a URL). > >/tvb > >- Original Message - >From: "Didier Juges" <shali...@gmail.com> >To: "Bob Albert" <bob91

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

I used the PPS from a Thunderbolt (fast rise lime, low rep frequency, was handy) and a digital storage scope and a couple of resistors to make a reflectometer based on this experiment: www.ko4bb.com/getsimple/index.php?I'd=coax-cable-impedance-matching You can very clearly see a 50 ohm/75 ohm

Re: [time-nuts] Working with SMT parts.

I concur. I have been using ExpressPCB extensively over the last 2 years with great satisfaction now that it is possible to get Gerber files from them. I typically use the mini board pro service (3 bare boards, 2 sided with solder mask and silk screen) for prototypes and then buy the Gerbers to

[time-nuts] KO4BB Manuals

Thank you to those who let me know of an issue with my Manuals site last week and this week. It turns out that the primary issue was not lack of disk space (even though that was going to be an issue very soon, so that has been fixed preemptively) but an issue with the download app. In the

Re: [time-nuts] Very Accurate Delta Time RF Pulse Measurements

Have you looked at the blitzortung.org system? There may be some ideas to glean from that On July 28, 2016 6:12:54 PM CDT, Jerome Blaha wrote: >Hi Guys, > >This is a little outside of time-nuts scope, but not by much. I'm >interested in finding the time between two

[time-nuts] KO4BB out of space

KO4BB.com ran out of disk space. Apparently the Control Panel indicated I was using 120GB out of 160 available, but it was off by about 40GB... About 90GB of that are manuals. A good bit of the extra are duplicate files that resulted from the site hosting transfer a couple of years ago that

Re: [time-nuts] KS-24361 rom

I will be glad to host it of course, but you cannot directly post it to a particular directory, you just upload it and I will move it. Please note that the HP guy who was instrumental to establishing the obsolete manuals on the HP site (Dave Cunningham was his name I believe) actually asked me if

Re: [time-nuts] Unix software to generate nice looking *DEV plots

Here is what my tool looks like: www.eds-fl.com/misc/graph/index.php You need to download a data file first, I added a link to download a small file 9kB. Again, this is not an ADEV tool, the file format is binary (came out of an old DOS tool that could not plot to save its life...) but it's

Re: [time-nuts] Unix software to generate nice looking *DEV plots

I have done something similar at work (not for adev, for plots of corona test results on HV transformers) but since most engineers here are Linux/UNIX challenged, I put the Perl scripts on a Linux box and let people send their data through a web page via cgi, which returns the plot as graphic.

Re: [time-nuts] For those of us that did the CPU upgrade for the 5370

Hopefully, they will have installed the U.FL connector on the WiFi board so that you can install the antenna outside the enclosure with a short coax cable. Besides, it's low power ;) Didier KO4BB On March 15, 2016 2:10:21 PM CDT, Poul-Henning Kamp wrote: > >In

[time-nuts] Thunderbolt monitor kits available doon

Finally, by popular demand, another batch of Thunderbolt Monitors are coming... Check http://www.ko4bb.com/getsimple/index.php?id=the-thunderbolt-monitor-kit Didier KO4BB -- Sent from my Moto-X wireless tracker while I do other things. ___

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

For those who want to remotely monitor their Thunderbolt, I am getting ready to put out a new Thunderbolt kit with WiFi. With the WiFi option, it is a server compatible with LadyHeather in client mode over the net. The prototype is working, I am ready to buy the production hardware, which

Re: [time-nuts] Einstein Special on PBS

Wow. So elegantly simple explanation, thanks John! On November 27, 2015 2:54:51 PM CST, John Miles wrote: >So, here's how I finally grokked this stuff. c, the speed of light in >a vacuum, is often spoken of as a "speed limit" that nothing can ever >exceed. That's a bad way to

Re: [time-nuts] beaglebones, time, web services

I have been working on and off on that kind of project for a while. One type of issue you have when trying to control hardware from a web page is that any hardware access from a web server poses many issues, such as permissions and the fact that web servers are basically stateless and many are

Re: [time-nuts] Manuals heading for the dumpster

I think the main contributor to the death of their business is that new equipment comes with usually worthless manuals, and even for those who have somewhat better manuals, the instruments are still not repairable by the amateurs. I realize that free sites (like mine) probably did not help,

Re: [time-nuts] HP 10544A repair

The quarantine is officially over (for this week :) Thanks for the uploads Didier KO4BB PS: I am now trying to move the manuals and equipment specific docs out of the GPS Timing folder into the manufacturer's folders. I realize it may be less convenient for those who are only interested in

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

Is the new RPi2 any different in that regard? On April 7, 2015 8:17:12 AM CDT, Daniel Mendes dmend...@gmail.com wrote: 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

Re: [time-nuts] Seeking Racal 9480 Manuals

Not at home right now but if you send me an email with what needs to be done, I'll be glad to do it. Didier KO4BB On March 12, 2015 6:54:06 PM CDT, Dan Rae dan...@verizon.net wrote: On 3/12/2015 1:47 PM, George Atkinson wrote: Done. But you might want to get Didier to correct the file names,

Re: [time-nuts] 50 ohm driver

. Re: Trimble Thunderbolt NMEA ? (Didier Juges) 7. Re: 50 ohm Driver (Bob Camp) 8. Re: 50 ohm Driver (Charles Steinmetz) 9. Re: new tdc from Texas (Angus) 10. Re: new tdc from Texas (Attila Kinali) -- Message: 1

Re: [time-nuts] Pinout of FEI 5680B

I have added this info to the wiki: http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_pin-out Thanks Didier KO4BB On Sat, Feb 21, 2015 at 2:25 PM, Bob Camp kb...@n1k.org wrote: Hi Just so it goes into the archives. Here’s the pinout for the FE-5680B with a 15 pin

Re: [time-nuts] 50 ohm driver

. --- Graham / KE9H == On Sat, Mar 7, 2015 at 7:58 AM, Didier Juges shali...@gmail.com wrote: Martyn, if you only need 1Hz, I recommend you use a MOSFET driver like the MIC4420 series or the UCC27531, powered from 10V with a 50 ohm output resistance. These parts have several A current capability, 18V

Re: [time-nuts] Trimble Thunderbolt NMEA ?

development board. No need to make custom PCBs. On Tue, Mar 3, 2015 at 5:00 AM, Didier Juges shali...@gmail.com wrote: Tim, It shouldn't be too hard to modify the code for my Thunderbolt monitor to make it into a TSIP-NMEA converter. The last version of the kit has a uC with two serial ports. I m

Re: [time-nuts] Trimble Thunderbolt NMEA ?

at the moment, but I have released the source code for the kit. Didier KO4BB On March 2, 2015 5:06:21 PM CST, Tim t...@skybase.net wrote: On 3/03/2015 4:33 AM, Didier Juges wrote: Tim, NMEA is normally used for navigation. It would seem unlikely that anyone would want to use a Thunderbolt

Re: [time-nuts] Trimble Thunderbolt NMEA ?

Tim, NMEA is normally used for navigation. It would seem unlikely that anyone would want to use a Thunderbolt for navigation. Can you elaborate on what you are trying yo do? Didier KO4BB On February 25, 2015 10:11:08 PM CST, Tim t...@skybase.net wrote: Hi all, Is there a way to get NMEA

Re: [time-nuts] SR620 question

Simply pasting the link did not work, but it was close enough :-) The links that include an IP address (like 81.226.54.139 below) only work until midnight EST, then they are cleared. It is easy enough (but not necessarily intuitive) to go to the manuals page and search again for the document.

Re: [time-nuts] D term (was no subject)

Maybe we are getting a little off-topic here, but a very long time ago I was dealing with industrial ovens used to braze ceramics used to make microwave tubes. It was very difficult to maintain the precise temperature ramp up and down, particularly as the oven was not always loaded the same way.

Re: [time-nuts] (no subject)

Without a D term, PI loops can be unstable when the gain (P) is increased. If you will, with a large error, the correction will itself be large and as the system corrects itself, it may overshoot the target value, going into a low (or high if you really blew it) level oscillation around the

Re: [time-nuts] Questions regarding tuning Thunderbolt with Lady Heather -- GPSDO's

This operation is very typical of all of the cell site GPSDO’s. The only part that is unique to the TBolt is the ability to fiddle the loop characteristics a bit. And the fact that the GPS's CPU clock is derived from the 10MHz and therefore aligned to the PPS so there is no hanging bridge and

Re: [time-nuts] GPS leap second pending (TBolt/Heather)

Re: Note that this is not a GPS problem, nor a Trimble problem. It's just a problem with user written software. I agree with Mark's comment. His software makes no attempt to interpret or correct the information put out by the Thunderbolt, it simply reports it. My Thunderbolt Monitor does the same

Re: [time-nuts] Shera VXCO Controller and PCM61P

The MAX5318 is available at Digikey. Not cheap, and not sure if it is electrically compatible, but it has good specs (not an audio DAC). And it is in a TSOP package, so can be soldered on a small adapter board Didier KO4BB On Fri, Jan 16, 2015 at 1:49 PM, Jerry Pixton jpix...@shentel.net wrote:

Re: [time-nuts] Current state of optical clocks and the definition of the second

I have a page that illustrates how you can use a delay line and a mixer to separately obtain AM and PM http://www.ko4bb.com/Timing/Phase_Detector Didier KO4BB On January 14, 2015 1:19:11 PM CST, Mike Feher mfe...@eozinc.com wrote: At those low levels, how does one differentiate between phase

Re: [time-nuts] Arduino GPIB

Yes, you can get an Arduino R3 on eBay for $4 with shipping... The GPIB connector will cost you more! Didier KO4BB On January 12, 2015 8:45:12 AM CST, paul swed paulsw...@gmail.com wrote: That certainly is a hack. But its something I have often thought about and never did. He is right its

Re: [time-nuts] June 30 2015 leap second

Hi Tom, You are correct, but it does not really matter because it will not be instantaneous, and for a period of time that is well within the range of human perception, the clock will be off by more than you would normally expect. We have been talking about NTP being able to keep the time to

Re: [time-nuts] June 30 2015 leap second

There are many systems for which the Google fix would not work in the current state of technology unless implemented by EVERYBODY synchronously. At least everybody who depends on precise time like banking and financial systems, let alone the physicists and many others... Keep in mind that this

Re: [time-nuts] HP 58503A Com 4 conflict

To add a small dose of additional complexity, Visual Basic 6.0 (and I suspect other dev tools of that generation) only support COM ports up to 16. Not as bad as 4, but still a problem on occasion. Didier KO4BB On January 4, 2015 12:03:05 PM CST, Bob Camp kb...@n1k.org wrote: Hi Ok, off into

Re: [time-nuts] Are these PRS10's worth it ?

the performance of a GPSDRb is mostly driven by the GPS and PLL anyhow. Didier KO4BB On Tue, Dec 30, 2014 at 7:14 AM, Didier Juges shali...@gmail.com wrote: You can get a working LPRO for $150 with very reasonable shipping. To me, that's a better deal unless you absolutely need the thrill of trying

Re: [time-nuts] Downloaded HPs SmartClock / Size of Lucent modules.

Clearly off-topic, but hopefully it will stop here... The Dell supplies use a 3 wire cable and have a resistor in the power supply connecting the 3rd wire to ground. The value of that resistor tells the laptop the current capability of the supply (they have various models between 3.0 and 4.5A) so

Re: [time-nuts] LNA and Alias

Bob, It may not have been Comcast. I had issues (cockpit error on my part) with the server this morning around the time you wrote your message. It should be OK now. However, the new setup is making it more difficult to attach links to documents because when you click on a document in the Manuals

Re: [time-nuts] Simple AC mains zero-cross detector

Charles, A commend regarding your ZCD. You propose to use a dual 120V primary transformer to generate the isolated 120V AC needed by your circuit. Unless specifically designed for that purpose, the isolation between the two 120V primaries of a common transformer is probably not as good as the

Re: [time-nuts] Documents relevant to SR620

Apologies to Jean Louis, I obviously missed that part... :) On Wed, Dec 10, 2014 at 3:47 PM, Jean-Louis Oneto jl.on...@free.fr wrote: I just uploaded the file to K04BB. com. Best regards, Jean-Louis On 10/12/2014 19:10, Charles Steinmetz wrote: Jeaen-Luis wrote: The size of the file

[time-nuts] Manual repository

Users of my web site may have had difficulties getting some of the files in the last couple of months. Particularly, those files that were recently uploaded. Typical symptom would be a file that was uploaded, was removed from the Recent Upload folder (indicating that I moved the file to it's

Re: [time-nuts] Linear voltage regulator hints...

Voltage References are usually not able to deliver much more than a few 10mA. Having a stable reference means no big temperature gradient on the die, so that precludes a big pass transistor. Most likely, you will have to roll your own. Using TL431 types of shunt regulator with a single

Re: [time-nuts] Linear voltage regulator hints...

That seems to be generally true, but as always there are outliers. The LT1034 bandgap reference has 6uVp-p of low frequency noise at 2.5V, which compares favorably with the 20uVp-p of noise at 6.95V of the LM399. Of course, for many applications, you will have to amplify the 2V reference to what

Re: [time-nuts] PRS-45 Cs Standard

Magnus and all, Thanks for the heads up, the Upload Instruction link has been fixed. The short of it: click on the Upload File button, use manuals for both login and password, enter your email and any message for me (optional), select your file, fill the info the fields about the document as

Re: [time-nuts] PRS-45 Cs Standard

, Magnus Danielson mag...@rubidium.dyndns.org wrote: FTS4065C revision J manual uploaded. I knew the login and password where some fake values, but I just could not locate it and didnt' have them cached. Cheers, Magnus On 12/06/2014 01:56 PM, Didier Juges wrote: Magnus and all, Thanks

[time-nuts] NMEA Parser

The Visual Basic NMEA Parser (with source code) has been posted: http://www.ko4bb.com/NMEAParser It is work in progress, is not and never was intended as a finished product. I used it to further my understanding of the NMEA protocol as it is used by GPS receivers, and to troubleshoot a few other

Re: [time-nuts] NMEA Parser

any exotic ocx or dll, just the standard stuff that is installed with VB 6.0. Didier KO4BB On Thu, Nov 27, 2014 at 9:56 AM, Didier Juges shali...@gmail.com wrote: The Visual Basic NMEA Parser (with source code) has been posted: http://www.ko4bb.com/NMEAParser It is work in progress

Re: [time-nuts] Minicircuits 10% discount in December

Another reason is reproducibility. If you or someone else wants to reproduce your design, using a well defined and available commercial part makes it much easier to achieve the same performance, particularly for RF components. Didier KO4BB On November 27, 2014 12:41:34 PM CST, Richard (Rick)

Re: [time-nuts] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

Just remove the TCXO the 10811 just plugs in Note that there are many different versions of the 10811. I am familiar with at least two incompatible mechanical configurations: one is connectorized and the other is not. Didier KO4BB On Thu, Nov 27, 2014 at 5:43 PM, Scott McGrath

Re: [time-nuts] LTE-Lite Plans

Said, Your drawing looks better than those by Bob Pease, and he was never embarrassed by his :) Thank you for your extensive contributions to time nuts Didier KO4BB On Tue, Nov 25, 2014 at 7:28 PM, S. Jackson via time-nuts time-nuts@febo.com wrote: Guys, I never expected such an intense

Re: [time-nuts] LTE-Lite Plans

Jim, I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts it pretty on the screen (at least that's how I remember it :). I am not at home at the moment but I'll be glad to send it to you if you are interested. May not do what you want, but it will get you started.

Re: [time-nuts] rs-422 rs-232 to fast ethernet converter

Graham, There are a number of WiFi to serial modules like the one I use on my Thunderbolt monitor: The Microchip WiFly RN-XV-171. Once configured (typically using a PC), they will present a TCPIP port (TCP or UDP) from which you can get and send data directly to the serial port. Alternately,

Re: [time-nuts] Lucent KS-24361 Web Page

Brooke, Following the links from your page (nice work, thank you) lead me to your Thunderbolt page where you ponder the death of your iCruze monitor. If you refer to the picture of the microprocessor board, you will notice that the locations marked D1, D2 and D3 are populated by zero ohm

Re: [time-nuts] 10MHz Rubidium reference source for frequencycounter

Charles, You can always upload time-related material to my Manuals page: www.ko4bb.com/manuals Didier KO4BB On November 3, 2014 2:43:47 PM CST, Charles Steinmetz csteinm...@yandex.com wrote: Tom wrote: As I understand it, his project is to use the high frequency output of a ublox NEO-7M to

Re: [time-nuts] Phase, One edge or two? (was Digital mixing with a D Flip Flop)

Even more effective would be to sample the entire 10MHz waveform instead of just the zero crossing. By doing a best fit of the entire waveform, you should be able to estimate the zero crossing with much greater precision because now the noise is averaged over the entire waveform instead of a

Re: [time-nuts] GPS for ntp

Check lightningmaps.org, mentioned on this list before for lightning location via TOA using STMicro Cortex -M4 devices. Didier KO4BB On October 20, 2014 8:39:16 PM CDT, Joseph Gray jg...@zianet.com wrote: What does everyone think of this GPS module for ntp use? According to the specsheet, it

Re: [time-nuts] FE-5680 Linux command line tool

at 7:45 AM, Didier Juges shali...@gmail.com wrote: Most EEPROMs have I2C or SPI interfaces. Some Flash chips have JTAG. Didier KO4BB On October 10, 2014 4:47:19 PM CDT, Tom Wimmenhove tom.wimmenh...@gmail.com wrote: Thanks Joe! I don't have the clip-ons but of course I could get them. I

Re: [time-nuts] FE-5680 Linux command line tool

Most EEPROMs have I2C or SPI interfaces. Some Flash chips have JTAG. Didier KO4BB On October 10, 2014 4:47:19 PM CDT, Tom Wimmenhove tom.wimmenh...@gmail.com wrote: Thanks Joe! I don't have the clip-ons but of course I could get them. I know the chip has a JTAG interface, but I've only used

Re: [time-nuts] Sun Outage

Just to put that in perspective, we're measuring a few degrees of phase shift in a 32 GHz signal on a path that is over a billion km long. Now this is fully qualified nuttiness :) Didier KO4BB On October 10, 2014 8:17:13 AM CDT, Jim Lux jim...@earthlink.net wrote: On 10/9/14, 10:16 PM, Andy

  1   2   3   4   5   6   7   8   9   10   >