[time-nuts] OT Low Jitter FPGA Programming

I'm looking for someone experienced for an ultra low jitter clock generation an re-clocking project that includes FPGA programming. Anyone interested? Please contact me off list. Adrian ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe

Re: [time-nuts] (UK) NPL open house

number 08914892 > http://www.kirkbymicrowave.co.uk/ > Tel 01621-680100 / +44 1621-680100 > > > On 11 May 2018 at 12:57, Adrian Godwin <artgod...@gmail.com> wrote: > > > Next thursday : > > > > https://www.eventbrite

Re: [time-nuts] Anybody have suggestions for time related science fair projects?

How about a demonstration of how GPS works, substituting sound waves for radio ? Maybe three sound sources with harmonically-related frequencies, then measure their phase difference on an oscilloscope. Cheat a bit : you don't need to do cdma acquisition. Have one reference at a low frequency,

[time-nuts] (UK) NPL open house

Next thursday : https://www.eventbrite.co.uk/e/national-physical-laboratory-open-house-2018-prepare-to-be-amazed-tickets-42330306085 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Racal 9475 Rubidium

Like this one ? Yes, very common - I'm sure something suitable could be found, if not in my junkbox then at an amateur radio sale. http://radioattic.com/images/martin/Martin_Astron_RS-20A_more.jpg On Thu, May 3, 2018 at 4:37 PM, Dan Rae <dan...@verizon.net> wrote: > On 5/3/2018 7:38 A

Re: [time-nuts] Racal 9475 Rubidium

What sort of heatsink does it need ? Do you need the original part or would a lightly-machined generic module do ? There are some lovely heatsinks in obsolete (server quality) PCs. Huge chunks of copper with a fine fin structure and a matched fan. Not all of them are noisy. On Thu, May 3, 2018

Re: [time-nuts] TCVCXO Adjustment

f the > objective is to compare data from different locations, getting it set may > be as > big an issue as the TCXO. If it’s a single location and the time is > arbitrary, then > maybe not so big a deal. If it’s all arbitrary … why worry about drift? …. > > GPS on the board looks

Re: [time-nuts] TCVCXO Adjustment

If you compare VCXO time with UTC or GPS once a month to an accuracy of 1s (with NMEA or even a time signal and manual pushbutton) and make a correction for the 2.5 million seconds that occurred since the last correction, you'll be better than 0.5 ppm. Is that good enough ? On Sat, Apr 14, 2018

Re: [time-nuts] TCVCXO Adjustment

Could you use the "pips" instead of a PPS signal, again comparing them some weeks apart to give a long reference time ? https://en.wikipedia.org/wiki/Greenwich_Time_Signal If your local radio broadcaster doesn't play something like them, they could probably be generated with a web application.

Re: [time-nuts] TCVCXO Adjustment

the current operating system specs, produce Mac, Linux and Windows variants, multiple languages, etc etc. Unless you're in that business and can get some of that effort back through sales, it's a mess. -adrian On Fri, Apr 13, 2018 at 3:30 AM, Wayne Holder <wayne.hol...@gmail.com> wrote: > Firs

Re: [time-nuts] TCVCXO Adjustment

Why not put a GPS receiver in it ? It won't always get a lock, but if it gets accurate time every few weeks it can do the long-term tweaking someone suggested in the watch thread (call in to the watch repair two weeks apart). Except it can be done more or less EVERY two weeks. I agree, a phone

Re: [time-nuts] Cheap jitter measurements

That may be an article of faith for those who haven't experienced the delights of time-nuttery, but to be fair, the man with n<2 clocks doesn't know what time it is either. Even if n=1, he only believes he knows what time it is. I appreciate that the clock-blessed may have doubts about the truth

Re: [time-nuts] Frequency deviations in Europe affect clocks

There's a fairly thorough explanation here (especially the long article that begins with a map) https://electronics.stackexchange.com/questions/360328/serbia-kosovo-power-grid-row-delays-european-clocks-why On Fri, Mar 9, 2018 at 7:26 AM, Bill Hawkins wrote: > Well, if

Re: [time-nuts] Need a Watch Recommendation

Eurochron (I believe they're low-end brand of Junghams) make a plastic DCF77 watch. 'Plastic' doesn't do it justice - although the one I had eventually wore away, it was attractive and well made and lasted for several years. I think this is the WWVB equivalent.

Re: [time-nuts] WWV or Net Clock controlled oscillator

of automatic player, and from the age of the system I would imagine it would have been semi-mechanical, like a player piano. How does the controller you are restoring operate ? On Sun, Mar 4, 2018 at 11:11 PM, Tom Van Baak <t...@leapsecond.com> wrote: > Adrian, et al. > > An upda

Re: [time-nuts] WWV or Net Clock controlled oscillator

There is indeed a 60Hz out picdiv from Tom Van Baak - http://www.leapsecond.com/pic/picdiv.htm. It's not in that list but ask Tom. I've just used one (modified for 50Hz out) to drive a 1A H-bridge circuit that supplies a 12V peak-peak square wave to an old LED clock, replacing the original

[time-nuts] Sigtec GPS receiver

? -adrian ___ 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 instructions there.

Re: [time-nuts] Symmetricom 58532A GPS Antenna : Launch3 Surplus

It's called 'adhesive lined heatshrink'. Yes, it's available, though a reel of the Good Stuff (Raychem) costs a small fortune. They also make custom boots to fit various standard connectors. Probably best bought as surplus or from a trusted seller who bought reels from military, autosport or

Re: [time-nuts] Receiving the MSF time signal on cheap radio modules

Hi Deirdre, I'd like to repeat your measurement at a different location (eastern england). What did you use to capture the data and write it as a vcd file ? -adrian On Tue, Feb 6, 2018 at 6:40 PM, Deirdre O'Byrne <deirdre@gmail.com> wrote: > OK so it's not the microsecond or n

Re: [time-nuts] GPS Jamming

What a pity nobody thought to include an accuracy degradation system into GPS itself, for use when you don't want the enemy to benefit from it. And how odd to show off your secret jamming technology in a major scheduled exercise, so the Bad Guys can study it. On Fri, Jan 26, 2018 at 2:57 PM,

Re: [time-nuts] PBS, Tue evening, The Secret of Tuxedo Park

Joe's link worked for me earlier this afternoon in the UK, but is blocked now at 10pm local time. Glad I watched it when I could ! On Wed, Jan 17, 2018 at 10:00 PM, Bill Metzenthen wrote: > It also worked in Australia last night. I watched a few minutes and > decided to

Re: [time-nuts] LED replacement screen for 53131A 53132A!!??

Like this one ? (Not for a 53132A but a similar problem) Better still would be a graphics display that emulates the original annunciators. https://www.youtube.com/watch?v=GgQS7ePEFmA On Sat, Jan 6, 2018 at 9:14 PM, wrote: > Hi, > > Saw this on the EEVblog and wondered if

Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

A similar product is the Polar Toneohm. I've been after one for a while but they seem to go for high prices. On Mon, Jan 1, 2018 at 12:12 AM, Gary Woods wrote: > On Sun, 31 Dec 2017 20:56:26 +0100, you wrote: > > > Without a thermal camera I've used a 4-1/2 digit DVM

[time-nuts] Vectron oscillator teardown

https://www.youtube.com/watch?v=oMcRUqhrYNY Right at the end of this teardown (50:50 minutes) Mike reaches the Vectron oscillator module and opens that up too. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

gards > Paul > WB8TSL > > On Wed, Dec 13, 2017 at 4:05 PM, Adrian Godwin <artgod...@gmail.com> > wrote: > > > It's a bit bizarre that it uses Basic. I just remember my local ARC using > > it as a project sometime ago. Possibly in the 20th century. :) > > &g

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

superset > that I can just simplify. > > Rick > > > On 12/13/2017 12:10 PM, Adrian Godwin wrote: > >> Maybe this one ? >> >> http://www.qsl.net/pa3ckr/bascom%20and%20avr/ad9951/index.html >> >> There are probably many others >> >>

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

Maybe this one ? http://www.qsl.net/pa3ckr/bascom%20and%20avr/ad9951/index.html There are probably many others On Wed, Dec 13, 2017 at 8:03 PM, Richard (Rick) Karlquist < rich...@karlquist.com> wrote: > I need a very simple controller to tune a DDS with up/down > switches (imagine setting the

Re: [time-nuts] Next upgrade

it again with more patience and after 10 minutes or so, the modified ref0 goes into standby and the one without a receiver has only the green ON light. I guess that's working correctly :) On Thu, Nov 23, 2017 at 12:23 AM, Jerry Hancock <je...@hanler.com> wrote: > Adrian, when you stated

Re: [time-nuts] Next upgrade

not hot > plugging > the cable I don’t think they matter at all. If anything, the system is > more reliable > with a normal length pin on the connector. > > Bob > > > On Nov 22, 2017, at 6:08 PM, Adrian Godwin <artgod...@gmail.com> wrote: > > > > I've g

Re: [time-nuts] Next upgrade

I've got several of the Ref 0 boxes but none of the Ref 1. I've added an Oncore GPS receiver to one of them as per Peter Garde's notes and it works well. But I'd like it to run with an unmodified Ref 0 too in the ref0/ref1 configuration. Not that I need an HA reference but just for interest. I've

Re: [time-nuts] Recommendation for cheap GBIP adapter for Linux

The Galvant adapter appears to use a very similar protocol to the Prologix, but I'm unsure if it's exactly compatible. There have been large numbers of HP adapters on ebay - they're generally thought to be clones of varying quality. http://www.galvant.ca/#!/store

Re: [time-nuts] Designing an embedded precision GPS time

How do those compare with vectron's part : ? https://www.vectron.com/products/ocxo/mx-503.htm There's also this patent. http://www.google.sr/patents/US20020005765 I don't really know if that's valid - it seems to propose something similar to the numerically-compensated oscillator in my rather

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

Surely he'd want to be in an isolating suit to avoid introducing a nasty warm body into his nice stable cave ? On Wed, Nov 1, 2017 at 3:03 PM, jimlux wrote: > On 11/1/17 7:37 AM, Magnus Danielson wrote: > >> Hi, >> >> Silly people > >> want a relative comfortable

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On Wed, Oct 18, 2017 at 9:11 PM, Gary E. Miller wrote: > Yo Hal! > > On Wed, 18 Oct 2017 12:26:27 -0700 > Hal Murray wrote: > > > For getting started, you also need: > > SD card reader/writer > > keyboard and mouse (Pi has USB) > > display adapter

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

> Ethernet, add $25. > > Perhaps less : http://www.ebay.co.uk/itm/122596979464 ___ 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 instructions there.

Re: [time-nuts] Fast Rise/Fall Time Pulser

I expected it to be a variant of the Jim Williams avalanche pulse generator, but one of the photos shows a part marked AJK AAA that appears to be the active component. http://www.leobodnar.com/files/40ps-pulser-RevG.jpg On Tue, Oct 10, 2017 at 8:42 PM, Brooke Clarke wrote:

Re: [time-nuts] R XSRM Rubidium Standard

I almost always buy equipment that isn't working. It's fixing it that makes it interesting. What would I do with all the testgear if I didn't use it to fix the next bit ? On Fri, Sep 15, 2017 at 9:34 AM, Michael Prescott MSc < mike_presc...@hotmail.com> wrote: > I second Clint’s statement, most

Re: [time-nuts] GPS rollover on KS-24361

Is it the KS24361 code itself or the GPS receiver in it sending nonsense ? On Sat, Aug 19, 2017 at 10:38 PM, Hal Murray wrote: > > The REF 0 side is still sane. > > Argh. REF 0 has the same problem, but the ntpd that is looking at it is > happy. I can't find the

Re: [time-nuts] TBolt and the Local News

I wonder if we're about to see another wave of surplus Thunderbolts ? On Fri, Aug 11, 2017 at 12:59 AM, paul swed wrote: > Sweet. Yankee ingenuity at its best. $27K thats seriously nice. > Almost enough to get me to code something. But then its 911 services maybe > not. >

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

While it wouldn't be difficult to build such a device, manufacturing a decent quantity in less than 2 weeks to beat Trimble would be a tall order. There are, however, programmable converters : all the hardware you need and just needs some suitable software. For example :

Re: [time-nuts] Can I haz an anti-hydrogen maser now?

Don't put it anywhere near your hydrogen maser or they'll cancel each other out. On Sat, Aug 5, 2017 at 12:55 AM, Christopher Hoover wrote: > http://www.swansea.ac.uk/media-centre/latest-research/ > firstobservationofthehyperfinesplittinginantihydrogen.php >

Re: [time-nuts] Can Lady Heather set PC time directly from a TrimbleThunderbolt?

Could Lady Heather provide an NTP server so a local NTP client could access the GPS time ? Or is that an overcomplicated way to do it? On 3 Aug 2017 20:19, "David J Taylor via time-nuts" wrote: > I use an NTP client to set my Windows 7 64 bit PC time for digital > mode

Re: [time-nuts] GPScon running on Raspberry Pi 3b

On Fri, Jun 23, 2017 at 1:36 AM, Mark Sims wrote: > > I also have some CH3xx dongles that have some clone chips in them. Many > Linux drivers don't seem to be able to set the baud rate on those. > > I looked into this when I was struggling with a CH3xx interface recently. It

Re: [time-nuts] Power connectors continued

Working in motorsport, we used the Deutsch Autosport series. They're based on military connectors but are lighter and possibly cheaper. Still far from cheap, but high density, high reliability and MUCH easier to assemble than Lemos. Usually crimped pins and raychem heatshrink cable entry.

Re: [time-nuts] Poor man's oven

The specs for the ADC are pretty vague : most of the errors are around 2 LSB but all are quoted with vref at 4V. If you reduce vref (there's an internal option of 1.1V) you'll increase gain but some of those errors are going to stay physically the same. In general, I'd tend expect to get more

Re: [time-nuts] Poor man's oven

Wax is also used for thermostatic valves in engine cooling systems and domestic heating systems. On Mon, Jun 5, 2017 at 1:13 PM, Tim Shoppa wrote: > Here is a national new-technology of the art crystal oven from 1956: > > http://tf.boulder.nist.gov/general/pdf/1642.pdf > >

Re: [time-nuts] Temperature sensors and quartz crystals (was: HP5061B Versus HP5071 Cesium Line Frequencies)

Where do digital sensors (e.g. ds1820 and some more recent parts from TI) fit into this ? On Mon, Jun 5, 2017 at 12:59 AM, Attila Kinali wrote: > Moin, > > This discussion is kind of getting heated. > Let's put some facts in, to steer it away from > opinion based discussion.

Re: [time-nuts] Re. Interesting experiments with SDR

Assuming you're in the channel islands, you should be able to pick up BBC radio 4 long wave on 198kHz, if your SDR can handle frequencies that low. It's referenced to a rubidium standard and checked by NPL. It can also be used to discipline a reference, or compared with some other local standard

Re: [time-nuts] HP 105D FS

There doesn't seem to be a 100D at http://leapsecond.com/hpclocks/ Seems like that needs fixing :) On Sun, Apr 9, 2017 at 1:43 PM, wrote: > From the description, it sounds like a HP 100D not a 10D. > > John WA4WDL > > Perry Sandeen via time-nuts

Re: [time-nuts] TAPR TICC boxed (input protection)

The Siliconix PAD1 at 1pA and 0.8pF is still available : http://www.micross.com/pdf/LSM_PAD1_TO-72.pdf On Sat, Apr 8, 2017 at 4:52 PM, David wrote: > On Thu, 6 Apr 2017 22:23:43 -0400, you wrote: > > >David wrote: > > > >> I know one thing to watch out for if you are

Re: [time-nuts] Bye-Bye Crystals

For interest, and as part of art project involving crystals. I want to show a less third-age usage than is common in that space :).Acceleration effect on frequency may also be featured. No way would I do it for cost or quality. Like you, I normally use packaged oscillators for most things -

Re: [time-nuts] Bye-Bye Crystals

I'm not after quality - I do have an application in mind but it doesn't need to compete with mass production. Just wondering if it's feasible to make something crude that will resonate. On 14 Mar 2017 1:00 a.m., "Hal Murray" wrote: jim...@earthlink.net said: > what

Re: [time-nuts] Bye-Bye Crystals

The article mentions that the business started in his father's garage. What minimal equipment would you need to make your own crystals ? On Mon, Mar 13, 2017 at 2:11 PM, Van Horn, David < david.vanh...@backcountryaccess.com> wrote: > > Probably true for many things. My current design has six

Re: [time-nuts] Power Problems Lucent KS-24361, L101 & L102

There's a surface-mount fuse on the back of the board. But pin 3 seems to show no leakage to other pins. I'd be surprised if connecting it has caused any damage. Have you tried reconnecting it correctly ? On Sun, Feb 5, 2017 at 3:53 PM, Bob Camp wrote: > Hi > > The power

Re: [time-nuts] Li-ion Battreries

Recovered cells aren't only sold through ebay parts adverts - they're also used for production. I recently bought a few cell phone boosters which consist of an 18650, a charge circuit and a voltage booster to 5V. They were low cost and nicely made with an extruded aluminium case and they worked

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

The sensor Jim linked : Temp/humidity with I2C interface https://www.adafruit.com/products/1293 looks good - packaged, high res temperature, etc. It's not 'complete' in that it's only a sensor, but you only have to attach a USB-I2C adapter. Probably less work than connecting up the sparkfun

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

All these (including the one I linked) seem to be 0.5C only. This one gets to 0.2C : http://www.ti.com/tool/hdc1010evm On Tue, Jan 3, 2017 at 4:09 PM, Paul Alfille wrote: > If you don't mind using 1-wire sensors, there are many nice choices, like: > >

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

I haven't used this current generation of loggers (I do have a couple of older RS232 units) but there's quite a range at https://www.lascarelectronics.com/markets/environmental/ On Tue, Jan 3, 2017 at 3:08 PM, Tom Van Baak wrote: > I have some high-end temperature and

Re: [time-nuts] Leap Second Smear Monitoring

What's the best way to get a test stream for leap seconds? Would it be feasible to have a small set of NTP servers that insert a leap second every other day and remove it alternately? On 31 Dec 2016 8:41 p.m., "Magnus Danielson" wrote: > Hi, > > Thought I just

[time-nuts] new year crashes

I wonder if someone wasn't ready for their extra second : http://www.bbc.co.uk/news/uk-38482746 ___ 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 instructions

Re: [time-nuts] Version 5 wrong leap second

I had LH on a ks24361. I think it displayed :00 for 2 seconds (my attempt to record it failed). The autocapture (attached) was a little too early. I guess this is because LH is polling the receiver every second and the actual content depends on what the receiver replies and when it does it ? I

Re: [time-nuts] Anyone (ideally in the UK) got a spare rotary knob for the 5370B TI counter?

David, You're a volt-nut too, aren't you ? Maybe motorise the variac and keep your lab at 240V +/- almost-nothing ? On Sat, Dec 31, 2016 at 7:57 PM, Tom Miller wrote: > > - Original Message - From: "Dr. David Kirkby (Kirkby Microwave > Ltd)"

Re: [time-nuts] HP53132A Firmware Version 4613

How similar are the 131A and the 132A ? Is it possible to upgrade a 131 into 132 ? On Tue, Dec 27, 2016 at 8:37 PM, GandalfG8--- via time-nuts < time-nuts@febo.com> wrote: > I have just uploaded this firmware to Didier's (KO4BB) manuals site so it > should be available for download in the

[time-nuts] LH on X

at the top. I'm running xfce4 on Debian - I don't know whether this is specific to that combination. I also use the choices of focus-follows-mouse and don't-raise-selected-window. These might contribute to the problem with incorrect focus. -adrian ___ time

Re: [time-nuts] Lady Heather Version 5 is now available

Now running for me on Linux twice : one with a KS24361 and the other with a Res-T (rx only). Thanks ! On Sat, Dec 10, 2016 at 7:09 PM, Bob Camp wrote: > Hi > > Well there goes the neighborhood :) … > > It used to be that the absolutely terrific Lady Heather only worked on >

Re: [time-nuts] Switching regulator replacement for 7805

ermann N8UR wrote: > >> Thanks for that pointer! When I searched Digikey, I wasn't able to find >> anything that was in the 3-lead TO-220 case. I will definitely check >> out the Murata units, as I suspect they perform better than this one. >> >> John >> >> On

Re: [time-nuts] Switching regulator replacement for 7805

Thanks for this. I've seen something similar from Murata : http://uk.farnell.com/murata-power-solutions/oki-78sr-5-1-5-w36-c/converter-dc-dc-1-o-p-7-5w-1-5a/dp/2102101 Since they're a mainstream supplier of inductors they may have managed better performance - it would be interesting to compare.

Re: [time-nuts] RPi/ beagle bone-like computer without video

The tiny g3 routers are worth looking at. They have WiFi, Ethernet and USB, cost very little and will usually run wrt54g Linux. Can be rather short on memory though. On 30 Nov 2016 8:43 p.m., "jimlux" wrote: > I'm looking for a small linux single board - similar to RPi or

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

ion are about right for that sort of thing. Swap one > in and the > transmit frequency changes. Number 7 for 80 KHz. Number 8 for 85 KHz. > Number 7 for > 75 KHz. Just a guess … > > Bob > > > > > On Nov 26, 2016, at 7:40 AM, Adrian Godwin <artgod...@gmail.com>

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

I bought some old crystals on ebay : http://www.ebay.co.uk/itm/15114483 Is anyone familiar with this style ? I don't think the quartz is visible in the glass section : I imagine that's just an insulator. I think the quartz is under a brass disc, with a sping to hold the disc down visible

Re: [time-nuts] 53132 replacement fan

This one's pretty quiet. But the airflow is a bit lower. http://www.frozencpu.com/products/9367/fan-587/Sunon_MagLev-Vapo_40mm_x_20mm_Fan_w_TAC_Sensor_Wire_-_Bare_Wire_HA40201V4--C99.html?tl=c15s560b53=mrFX8Rvo On Mon, Nov 21, 2016 at 5:57 PM, jimlux wrote: > On

Re: [time-nuts] precision timing pulse

Tom describes the PIC as a 'poor man's FPGA'. And I'm aware of how they're programmed - I agree they're a good choice for this sort of device. However, even poor men can use FPGAs now. I'm following with interest the open-source toolchain available for the Lattice ice40,

Re: [time-nuts] TCXO drift - related to TVB's posting

What if your shop reference were drifting up ? On Sat, Nov 12, 2016 at 11:25 PM, Joseph Gray wrote: > TCXO, not OCXO, but related. Sorry, but I have no graphs. > > I work for a municipal radio shop. We service radios that span 20 > years (through acquisitions, it was GE,

Re: [time-nuts] China Oscillator Alternative

I looked at this when it was mentioned here a few weeks ago. I did the procedure in an hour or so and it's working well, keeping the PPS within 50ns of GPS with 6-8 satellites. Monitored by the patched version of Z38XX at the moment though I look forward to putting Lady Heather on the job. The

Re: [time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

But trailing isn't the same as falling. The leading edge can be of either polarity. On Wed, Nov 9, 2016 at 11:28 PM, Bob Stewart wrote: > Tom, > How many times have people posted here, on time-nuts, not to trust the > trailing edge of a 1PPS pulse? > > Bob

Re: [time-nuts] 5071A with ATTENTION flashing

Yes, I'm sorry about that. On Wed, Nov 9, 2016 at 5:18 PM, paul swed <paulsw...@gmail.com> wrote: > Adrian > I think you may have responded to the wrong thread?? > Regards > Paul > > On Wed, Nov 9, 2016 at 10:21 AM, Adrian Godwin <artgod...@gmail.com> > wrote:

Re: [time-nuts] 5071A with ATTENTION flashing

I'm still struggling to get the acrylic I need. I've been into London a few times but not been able to get to the shop in business hours. Guess I could order online if necessary but it will cost a fair bit more. On Wed, Nov 9, 2016 at 3:19 PM, paul swed wrote: > I saw the

Re: [time-nuts] HP 5275A

ut some pix of a 9815 calc. That would be pretty neat. >> On really old stuff if you can't find the part needed its pretty easy to >> replace the whole function with modern answers. I know it sort of breaks >> the original mode but for me at least its a case of getting it going.

Re: [time-nuts] HP 5275A

How about some pix of a 9815 calc. That would be pretty neat. >> On really old stuff if you can't find the part needed its pretty easy to >> replace the whole function with modern answers. I know it sort of breaks >> the original mode but for me at least its a case of getting it

[time-nuts] HP 5275A

Slightly off-topic, as this is a general repair question. But it's a TIC. I'm repairing a 5275A timer (all-discreet count logic to 100MHz, neon bulb display, a most amazing bcd to decimal decoder made from neons and LDRs, 1-2-2-4 decade counters ..) and the current problem is a 2n1038-2 germanium

Re: [time-nuts] Time nut soon to be in Shenzhen

Ref. the thread about burning tantalum capacitors .. If I were going to china I'd be looking at the tools. Many might be low quality (but cheaper than ebay). Others might be excellent. You need to see them to find out. On Sun, Nov 6, 2016 at 4:33 PM, Azelio Boriani

Re: [time-nuts] I love the smell of tantalum in the morning

You might also want normal cold tweezers to place the part. I'm not sure what an orange stick is, around here I'd use a wooden toothpick. Perhaps that's the same thing ! The Swiss Venus tweezers have a lovely finish and the ends always meet. There are probably others as good. If you get some

Re: [time-nuts] I love the smell of tantalum in the morning

urchasing soldering tweezers without trying them > first. They are not easy to control solder application when mounting a > component. > > I do really like the Weller rt7 knife tip. > > On Sunday, 6 November 2016, Adrian Godwin <artgod...@gmail.com> wrote: > > > SMD

Re: [time-nuts] I love the smell of tantalum in the morning

SMD parts aren't going to go away. It's worth investing in good tools to deal with them and learning the best way to use them. I'd put tweezers quite high on that list, and although the metcals are worthwhile if you can avoid full price, the chinese tweezers are surprisingly useful at very low

Re: [time-nuts] I love the smell of tantalum in the morning

Metcal /OKI might be that other brand. I'd certainly recommend them, but the tweezers are not as fast to heat as the single tip devices. I've had little success personally with the hot air devices. I seem to toast the board before I melt the solder, and when it does melt it's not limited to one

Re: [time-nuts] Opening an Isotemp OCXO

The data sheet for the device only mentions 12V. Other data sheets (eg the 131) mention 5V and 12V, but don't indicate how to specify one or the other. Gerry Sweeny's article at http://gerrysweeney.com/diy-hpagilent-53131a-010-high-stability-timebase-option/ mentions a part number suffix that

Re: [time-nuts] Opening an Isotemp OCXO

The 1k resistor doesn't seem to feed the 'S30'. It looks as though pin 14 (Vcc) goes via that thick track to the +12 input. On Fri, Oct 28, 2016 at 5:46 PM, jimlux wrote: > On 10/28/16 8:31 AM, Peter Reilley wrote: > > Looking around with my scope it seems that the output

Re: [time-nuts] Opening an Isotemp OCXO

That's one sweet soldering iron. Is it an American Beauty ? On Fri, Oct 28, 2016 at 4:31 PM, Peter Reilley wrote: > I did finally get it open. I used a very large old style soldering > iron and .003 inch steel shim stock. I would melt the solder on the > straight

Re: [time-nuts] Linux PPS clues?

What is the circuit driving that signal ? It appears to have too little positive drive to overcome the capacitance. Perhaps it's an open collector with too large a pull-up ? On 21 Oct 2016 12:23 a.m., "Ilia Platone" wrote: > sorry, no attachment, this mail contains two

Re: [time-nuts] KSC big clock

Wow .. 24kW for a clock display ! On Fri, Oct 21, 2016 at 6:56 AM, Todd Caldwell wrote: > Hi All, > > I've been lurking and assembling gear for the most part, so this is my > first post I think. > > I was at KSC in May of 2010 for the launch of STS-132. Attached is a

Re: [time-nuts] PC clock generator without 14.318MHz

How about the Apollo launches ? On Wed, Oct 19, 2016 at 12:40 AM, jimlux wrote: > On 10/18/16 4:25 PM, Magnus Danielson wrote: > >> Jim, >> >> On 10/19/2016 12:51 AM, jimlux wrote: >> >>> On 10/18/16 2:30 PM, Tom Van Baak wrote: >>> Hi Vladimir, Some of

Re: [time-nuts] For those that insist on using switching power supplies

I would add a DC blocker for the input to the spectrum analyser. On Fri, Oct 14, 2016 at 7:59 PM, Hal Murray wrote: > > time-nuts@febo.com said: > >> Nick, thanks for your detailed reply. Would you happen to have a photo > of > >> the "spring looking things?" I am

Re: [time-nuts] TimeLab

On Sun, Oct 9, 2016 at 9:07 PM, Tom Van Baak wrote: > 3) The problems you are running into get far worse the less accurate and > less stable the sources are (such as mains, mechanical, vintage quartz, and > pendulum clocks). So that's why I developed the picPET time-stamping

Re: [time-nuts] TimeLab

by any software. Cheers, Adrian Magnus Danielson schrieb: > Hi, > > Well, yes. You can do some fancy stuff with additional hardware, but I > think with already a handful of relatively simple software fixes and > some basic setup conditions, a sufficiently robust method emerges. >

Re: [time-nuts] Measure GPSDO stability with minimum resources?

Yes, they're at http://www.ko4bb.com/getsimple/index.php?id=manuals=02_GPS_Timing/Lucent_KS-24361/KS24361-Z3812A-KR92830585-X98_4-A On Sat, Oct 8, 2016 at 12:00 PM, Magnus Danielson < mag...@rubidium.dyndns.org> wrote: > Hi Adrian, > > Except what Tom published on the Z3801A t

Re: [time-nuts] Measure GPSDO stability with minimum resources?

Recently, I dumped the ROM from a ks24361. I imagine it's the same or very similar code. Are there notes published somewhere ? It would be useful to compare them. On 7 Oct 2016 7:52 p.m., "Magnus Danielson" wrote: > Hi Tom, > > On 10/07/2016 06:02 PM, Tom Van Baak

Re: [time-nuts] AC line distortion

ons the freq exceeds 50Hz and when in need of energy but unable to cold start the suppliers, the freq dip below 50Hz. Adrian -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Thomas D. Erb Sent: Tuesday, October 4, 2016 2:02 PM To: time-nuts@febo.com Subject

Re: [time-nuts] AC line distortion [Was: HP 105B Battery, the saga continues]

ve the THD is of no importance for DC supplied things as the AC is rectified and stabilised. In that particular case, I would not bother about the AC energy quality at all. Best, Adrian -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jeremy Nichols Sen

[time-nuts] crystal notch filter // numbers

gs. Best regards, Adrian From: time-nuts [time-nuts-boun...@febo.com] on behalf of Bob Camp [kb...@n1k.org] Sent: Monday, October 03, 2016 12:17 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] notch filter for close in pha

Re: [time-nuts] notch filter for close in phase noise measurement

You throw away the 50dB figure, not me :) I will revert with numbers as I have to redo the settings. The bandwidth is much, much lower than 30Hz. From memory, the -58dB notch is valid for 0.1Hz freq shift only. Adrian Sent from my BlackBerry 10 smartphone on the Orange network. Original

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