Re: [time-nuts] Casio Wave Ceptor wrist watch - quick accuracy test

rechargeable battery has just started to fail and so I've ordered a new one. Jim On Mon, 11 Jun 2018 at 18:20, Esa Heikkinen wrote: > Hi! > > There seems to be some kind of comeback going on with 80's style digital > watches. You may find replicas of some 80's models or even re-makes of &g

Re: [time-nuts] time-nuts Digest, Vol 165, Issue 48

Gary- Interesting. The TICC is spec'ed to have a 10e-10 AD floor at 1 sec. Your measurement is slightly better than the spec. How can we know whether you are measuring the test source (JL GPSTLXO) or the stability of the TICC itself? Jim At 03:10 AM 4/25/2018, you wrote: >Send time-n

Re: [time-nuts] GPS coordinate differences between APRS.FI and Google Maps

Perhaps aprs.fi is reporting in dd.mm (degrees.minutes) format vs decimal degrees. That would be consistent with the numbers you are setting. On Fri, Apr 20, 2018, 8:01 PM Azelio Boriani wrote: > aprs.fi uses google maps... have you taken a look to your raw packets? >

Re: [time-nuts] 4046 replacement

, you may need to > make some changes to use the '7046 version but you can then make a value > judgement if the flaw had in fact mainfested itself as a problem in your > design? > > --Jim Harman ___ time-nuts mailing list -- time-nuts@feb

[time-nuts] General Recommendation?

appreciate some advice. Thanks! Jim ___ 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] Environmental sensor recommendations

ssembly + cable. Decent thermistors can > be had for less than a buck. > > -- > > > Check out ADT7420: > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ >

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

of about 0.1 ppm.It comes in a small package but you can get the Chronodot, a breakout version with 0.1" headers from Adafruit and elsewhere: https://www.adafruit.com/product/255 You can use the Chronodot by itself or hook it to an Arduino to access the full range of features. > -- --Ji

Re: [time-nuts] accurate 60 hz reference chips/ckts

ical design …... > > Bob > > There is interesting background on power grid frequency/time adjustment procedures here https://en.wikipedia.org/wiki/Utility_frequency#Time_error_correction_(TEC) and here https://en.wikipedia.org/wiki/Electric_clock#Accuracy -- --Jim Harman __

Re: [time-nuts] accurate 60 hz reference chips/ckts

ribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- --Jim Harman ___ 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.

[time-nuts] Argo AS-210 frame

the sizes of the panels are custom, and we can't rob from a donor TM-515. Would appreciate anyone who has worked on one to let us know. thanks Jim ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] Allan variance by sine-wave fitting

-Original Message- >From: Magnus Danielson >Sent: Nov 27, 2017 2:45 PM >To: time-nuts@febo.com >Cc: mag...@rubidium.se >Subject: Re: [time-nuts] Allan variance by sine-wave fitting > >Hi, > >There is nothing wrong about attempting new approaches, or even

Re: [time-nuts] Why discipline Rubidium oscillator?

On Mon, Nov 20, 2017 at 7:14 PM, Jerry Hancock <je...@hanler.com> wrote: > Have to do a cost/benefit analysis for the wife... I hope she is not the type of person who sets her watch 5 minutes ahead so she will arrive on time! -- --J

Re: [time-nuts] How good is your ADEV at 10E7 seconds? :)

tween LIGO and the pulsar array to find GW. LIGO won. Incidentally, LIGO has looked for GW coming from a pulsar. Vela was chosen as its frequency is in the LIGO sweet spot. Nothing was found however ( https://arxiv.org/pdf/1104.2712.pdf) - but this was 7 years ago. Jim On 18 November 2017 at

Re: [time-nuts] Discussion of precise time and frequency measurement

orth America relative to Europe. This culminated in the use of pulses on telegraph lines to transfer observatory time to remote stations. With this technique, very careful measurements, and mathematical advances they were able reduce the longitude uncertainty to less than 10 feet. -- --Jim Harman ___

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

On Thu, Nov 2, 2017 at 9:04 AM, Chris Caudle <ch...@chriscaudle.org> wrote: > > > That sounds like you just designed the worst GPSDO ever. > > -- > Chris Caudle > > Yes but the price and power consumption are right. I guess it all depends on your ap

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

move its pps 0.5 sec, which by my calculation would take about 41.667 seconds or about 11.5 hours. -- --Jim Harman ___ 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] OCXO Vectron 218Y44442

Sorry, this image http://www.patoka.ca/Vectron-218Y2/IMG_20171015_193511542.jpg On Mon, Oct 16, 2017 at 6:22 PM, Jim Harman <j99har...@gmail.com> wrote: > In your image ...125 it looks like there is a cold solder joint near the > bottom right, in the second "column" o

Re: [time-nuts] OCXO Vectron 218Y44442

ing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > -- --Jim Harman ___ 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] Resoration of 5065A - continued...

rnal frequency compensation (1, 5, and 8 on the can or mini-DIP) unconnected. The 741 has internal frequency comp and uses pins 1 and 5 for an optional offset null instead. --Jim Harman ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

[time-nuts] Tsunami detection via GPS

Some here may find this of interest. http://www2.unb.ca/gge/Resources/gpsworld.february08.pdf Jim Palfreyman ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] PLL book 3rd edition

When will it be available?? Jim wb4...@amsat.org On 8/18/2017 4:17 PM, Dr. Ulrich L. Rohde via time-nuts wrote: Yes, and there is a lot of useful material in place including CMOS and related new topics and update on numerical controlled oscillators . Thanks, Ulrich Sent from my iPhone

Re: [time-nuts] SOPHOS discussion of GPS jamming and eLoran

And I always tell anyone who asks me for advise as you do, skip it, unless you really know what you are doing, or you will get pawned. thanks Jim ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/

Re: [time-nuts] RS232 output on a 53181A

__ > 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. > -- --Jim Harman ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] The clocks at Windsor Castle, UK

hose things that sticks in your gut sometimes if you're a time nut. My dad was my original time nut. He found out that he could take pocket watches apart when he was a kid and get them running again (1930s). Fathers Day plug as well. Miss him a lot thanks Jim On Jun 16, 2017, at 6:02 PM,

Re: [time-nuts] BTTF : Austron 1210-C Crystal Clock

wrote: > Hi Jim, > > Maybe a version of this?: > > http://leapsecond.com/history/Benchmark.htm > > The audible (1 kc) whine was probably from the model 113 or 115. See if > any of the following pages remind you: > > http://leapsecond.com/hpcl

Re: [time-nuts] BTTF : Austron 1210-C Crystal Clock

an adjustable cam and microswitch. The receiver's audio was fed through the switch. I think the idea was that you could accurately measure the oscillator drift by adjusting the phase of the cam until you could hear WWV's tick during the short time the switch was closed.

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

ut amplifier is pretty slow. -- --Jim Harman ___ 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] Next Aug 21 eclipse and time flow

any anomaly. We, of course, are not in the path of the eclipse, however gravitationally there is still an alignment. Just through the Earth. Jim Palfreyman On 29 May 2017 at 08:17, iovane--- via time-nuts <time-nuts@febo.com> wrote: > On august 21 2017 a solar eclipse will sweep

Re: [time-nuts] calculating stats with gaps in the data

is interested. The main disadvantage of LSP is speed. It performs as O(n^2). This was a huge disadvantage back in the 70s when it was published, but with today's computing power it's not a problem. Unless you have 100 data points, then patience is required. Jim Palfreyman On 26 May 2017 at 07

Re: [time-nuts] TruePosition and Arduino Progress

; } } On Sun, May 21, 2017 at 2:56 PM, Jim Harman <j99har...@gmail.com> wrote: > Another way to do is to use the 1 PPS to trigger an interrupt on the > Arduino. Look at the documentation for attachInterrupt(). In the interrupt > routine, have it set a flag. The flag variable should

Re: [time-nuts] TruePosition and Arduino Progress

t > make > >> that work yesterday. More to follow. > >> > >> thanks much and 73, > >> ben, kd5byb > >> ___ > >> 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. > > > > > > > > -- > > > > Chris Albertson > > Redondo Beach, California > > > > -- > > Chris Albertson > Redondo Beach, California > ___ > 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. > -- --Jim Harman ___ 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] GPS seconds conversion on an Arduino

is provided so you can see how they did it. -- --Jim Harman ___ 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] TruePosition on an Arduino

ime structure. Contact me off-list if you want code examples. -- --Jim Harman ___ 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] Three-cornered hat on timelab?

gle roof in the attic. I calculate the day-to-day correlation at about 0.8. Making the time constant larger increases the variations somewhat, because the loop does not adjust as much, and they definitely get worse if I use a less optimal antenna locatio

[time-nuts] Name of integral of timing residual

nd you get "absement" and again you get "abcity" (I only recently discovered these terms). Does the integral of a timing residual have a name, and does the integral of *that* have a name as well? Any thoughts? Jim Palfreyman ___

Re: [time-nuts] The ultraAtomic clock for home

ction in the Southern Hemisphere. -- --Jim Harman ___ 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] HP-59309A Clock counts only seconds

e > 4000's really do have a limited lifetime I'd rather use a substitute. > > Jeremy, N6WFO > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instr

Re: [time-nuts] time-nuts equipment verification from scratch (was: WTB: GPSDO)

e? Also I have found that not all computer USB ports can supply enough warm-up current for a 5V OCXO. Or did you use a hefty USB charger and miss out on the ability to get logging info back over the USB port? -- --Jim Harman ___ time-nuts mailing list

Re: [time-nuts] Smart Phone time display accuracy...?

s 2017 à 03:32, Mike Baker <mp...@clanbaker.org> a écrit : > > > > Hello, Time-nutters-- > > > > Any thoughts on what the likely accuracy of smart phone time > > displays might be? > > -- --Jim Harman

Re: [time-nuts] Bye-Bye Crystals

Attila Kinali > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss

Re: [time-nuts] Bye-Bye Crystals

On Mon, Mar 13, 2017 at 6:05 PM, Jim Harman <j99har...@gmail.com> wrote: > Some of the Arduino boards, the Leonardo for example, use ceramic > resonators, Sorry, the Leonardo does have a crystal. The original Uno had a resonator. --

Re: [time-nuts] Bye-Bye Crystals

On Mon, Mar 13, 2017 at 4:53 PM, jimlux <jim...@earthlink.net> wrote: > I think the Arduino, for instance, uses a crystal (and the oscillator > electronics are inside the Atmel part) You're right. Some of the Arduino boards, the Leonardo for example, use ceramic resonators, whi

Re: [time-nuts] WTB: GPSDO

Glad you didn't fare any worse in the event. Good luck and very 73, Jim wb4...@amsat.org On 3/9/2017 3:45 AM, Jeff AC0C wrote: We had a small tornado come through north of our house about 1/2 mile on Monday. Really did a number on the antennas. Only electronics impacted was my old

Re: [time-nuts] How good is the left end of your ADEV curve?

, almost forgot, you'd also need a sampler. Jim Palfreyman On 26 January 2017 at 13:58, Tom Van Baak <t...@leapsecond.com> wrote: > > What can I do at home, to observe such processes? Or is it way beyond > > any imagination to participate in any such experiments? >

Re: [time-nuts] How good is the left end of your ADEV curve?

he sensitivity bands of Advanced LIGO and Advanced VIRGO, but the gravitational waves from Vela are probably too "faint" to be detected. But there is still no harm in trying. Jim Palfreyman On 25 January 2017 at 16:15, Hal Murray <hmur...@megapathdsl.net> wrote: > way way

Re: [time-nuts] Autodesk Eagle -- maybe they're listening

and other avenues to get tech support. Good luck. Jim Pruitt On Mon, Jan 23, 2017 at 4:56 PM, Mike Suhar <msu...@woh.rr.com> wrote: > Many companies are trying to jump on the subscription band wagon. It is a > way to keep a steady flow of income. Unfortunately, hobbyists are left >

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

gt; > > If you don't mind using 1-wire sensors, there are many nice choices, > like: > > > > http://www.embeddeddatasystems.com/Environmental-Sensors_c_44.html for > > temperature/humidity/barometric pressure... > > > > > > > > On Tue, Jan 3, 2017 at

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

You could try hooking up a transformer with a 20V secondary as an autotransformer to reduce the line voltage. On Fri, Dec 30, 2016, 9:09 PM Bob Stewart wrote: > If you can touch the heat sink for 2 seconds, you're made of sterner stuff > than I am! They run very hot. It's a

Re: [time-nuts] Measuring sidereal/solar time? Re: A Leap Second is coming

I don't think we could call it "amateur/semi-pro" but the millisecond pulsar J0437-4715 would be perfect for this. Bright and precise. Only for southern hemisphere people though. :-) Jim Palfreyman On 30 December 2016 at 19:59, Anders Wallin <anders.e.e.wal...@gmail.com&g

Re: [time-nuts] Lady Heather for homebrew GPSDO

data doesn't get clogged with routine data but the host can tell when to request detailed information. -- --Jim Harman ___ 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.

[time-nuts] Lady Heather for homebrew GPSDO

, but I would prefer a text-based rather than binary protocol and not to have to reformat all the NMEA data. Does this approach make sense, and if so which of the several standard GPSDOs would it be best to emulate? Thanks in advance for your insights -- --Jim Harman

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

Version 5.00 is working well with my 58503A, but I did find one annoying behavior. If LH is the active application, as in it has keyboard focus, I find my screen saver will not activate. Jim WN1X On 12/11/2016 11:45:10 AM, paul swed <paulsw...@gmail.com> wrote: Mark I am trying to use H

[time-nuts] I am looking to measure phase jitter between two synchronized DDS signals

if the jitter is acceptable. I really need able to make a bench measurement to qualify the performance. Thanks in advance for any suggestions. Jim James M. Potter PhD, Pres. JP Accelerator Works, Inc. 2245 47th Street Los Alamos, NM 87544 TEL:505-690-8701 FAX: 888-301-2833 mailto:jpot...@jpaw.com

[time-nuts] Sapphire oscillators

Anyone got any comments on this? http://www.theleadsouthaustralia.com.au/industries/technology/worlds-most-precise-clock-set-for-commercial-countdown/ Jim Palfreyman ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Nice! (I had one of those, 20 years ago . . . .) 73, Jim wb4...@amsat.org On 10/23/2016 1:49 PM, William H. Fite wrote: Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train so complex it has to go in every 3000 miles for an oil change. On Sunday, October 23, 2016

Re: [time-nuts] 1PPS to 32.768 khz

ust 3 chips. And you get RTC functionality and battery backup circuitry thrown in for free. -- --Jim Harman ___ 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] 1PPS to 32.768 khz

t; > ___ > 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. > -- --Jim Harman __

[time-nuts] Atomic Watch

Well I think there's a mistake or two here... https://www.inverse.com/article/20497-john-patterson-atomic-ce ___ 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

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

phase error stays within a pre-determined range. -- --Jim Harman ___ 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] ADC sample voting algorithm?

riggered directly by the PPS signal, thus eliminating any dependency on the interrupt latency. The PPS still generates an interrupt, but in the interrupt routine, all I have to do is wait for the ADC to finish, clear the Done bit, and reset the trigger. -- --Jim Harman _

Re: [time-nuts] time-nuts Digest, Vol 147, Issue 13

Re: TNS-BUF Amplifier --Jim Robbins wrote: Many thanks for your helpful TN work to John A. , Dr. Bruce and John M. Ordered 3 pieces. -- I second the thanks and ordered 2 pieces --Jim Stone On Wed, Oct

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

ges for the past 12 hours and 3-hour averages for the past 18 days. All this, including the GPSDO code, fits comfortably in a 32u4-based Arduino Micro, which has 32K of program memory, 2.5K of RAM, and 1K of EEPROM. -- --Jim Harman ___ time-nuts

Re: [time-nuts] Caroliine .. I need to move on

Well I'm intrigued! On 2 October 2016 at 15:53, Ian Stirling wrote: > going to the emergency place > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m >

[time-nuts] 10Mhz TXCO for LTE-Lite?

Did anyone implement an external 10Mhz TXCO for the Jackson-Labs LTE Lite? I'm finally getting around to trying to get 10Mhz out of this with a low enough impedance to drive a 50ohm cable. Thanks jim ab3cv ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] DIY VNA design

The intersection of HP equipment && Time-Nuts && VNWA mailing lists is >> At least two ;^) Jim n8qoh ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinf

Re: [time-nuts] Subject: Re: Working with SMT parts (Bob Albert)

--Jim Stone Hi Bob, Take a look at this nice simple little one chip "TDR" and lesson on how to use it to measure cable length and cable impedance. It uses a single AC14 (can use a DIP so no SMD needed) and gives a nice crisp 2 or 3 ns rise. The AC family is nice fast logic and has been us

Re: [time-nuts] Subject: Re: Working with SMT parts (Bob Albert)

Time-Nuts application like cheap zero-cross detectors using the AC04. https://www.youtube.com/watch?v=9cP6w2odGUc Regards --Jim Stone Bob Albert wrote: Well I got my adapter boards from China and managed to build my first SMT project, a square wave generator for TDR use. And it works! Th

Re: [time-nuts] Austron 2010B (disciplined OCXO) square wave conversion

I don't have the manual but I'm sure if you pop the cover you can find a nice sine wave inside (that is being converted to square wave). Un-solder one of the square wave output BNCs and patch in the sine wave. Now you have analog and digital outputs!

Re: [time-nuts] Q/noise of Earth as an oscillator

Hi Tom, You said: "you need energy; you need energy loss; you need cycles over which that loss repeatedly occurs." With regard to the earth, where is the first one? Sure it was there at the start when the solar system formed, but where is it now? Jim On 1 August 2016 at 12:16, Tom V

Re: [time-nuts] Q/noise of Earth as an oscillator

> What about an ADEV/TDEV plot of the pulsar J0437-4715? Very boring. It's a straight line from top left to bottom right. :-) See page 5 of this: http://arxiv.org/pdf/1004.0115.pdf Jim Palfreyman On 29 July 2016 at 17:33, Azelio Boriani <azelio.bori...@gmail.com> wrote: > What a

Re: [time-nuts] Q/noise of Earth as an oscillator

ks. Here's the data for J0437-4715 - one of the most stable pulsars we know about: F0 173.6879458121843 F1 -1.728361E-15 I'm sure the "Q" of Vela would be pretty decent - but I can tell you now, as a time-keeper, she's useless. Jim Palfreyman On 28 July 2016 at

Re: [time-nuts] Q/noise of Earth as an oscillator

ting frictional and other losses in a spinning object, with a spin-down time constant of 15,000 years. https://einstein.stanford.edu/TECH/technology1.html -- --Jim Harman ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.f

Re: [time-nuts] LSEM (Leap Second Every Month)

leap seconds because it ruins many hours of my observations at the radio telescope - but if this was implemented it would force the software problems to be fixed. Jim Palfreyman On 22 July 2016 at 06:01, Brooke Clarke <bro...@pacific.net> wrote: > Hi Tom: > > I like this ide

Re: [time-nuts] Visiting Greenwich

g a speaking clock using more modern technology, it uses > a 30 year old speech synthesizer chip and sounds just like Stephen Hawking. > > Morris > Melbourne, Australia > ----- >Date: Wed, 6 Jul 2016 10:42:19

Re: [time-nuts] Visiting Greenwich

Speaking of "speaking clocks" - here's two photos of the ones that used to be used in Australia: https://en.wikipedia.org/wiki/Speaking_clock#Australia The top photo with rotating optical disks is a gorgeous piece of machinery. The one below - I have one, and I keep it running. :-) On 6 July

Re: [time-nuts] Visiting Greenwich

Brilliant! Jim Palfreyman On 5 July 2016 at 15:00, Peter Monta <pmo...@gmail.com> wrote: > Hi Dave, > > The Harrisons are indeed at the observatory; also look for a regulator > pendulum clock in the octagon room. I'm not quite sure whether it was > running when I was t

Re: [time-nuts] Maser 0.7 nsec jumps solved

. "Welcome to the jungle, we've got fun and games..." Jim Palfreyman On 3 June 2016 at 15:00, Jim Palfreyman <jim77...@gmail.com> wrote: > Hi All, > > Thanks so much for your input and thoughts. It has really proved helpful > here at the observatory. > > As it tu

Re: [time-nuts] GPS altitude somewhat wrong?

On Wed, Jun 8, 2016 at 4:33 PM, Van Horn, David < david.vanh...@backcountryaccess.com> wrote: > Backcountry Access, Inc. > 2820 Wilderness Pl, Unit H > Boulder, CO 80301 USA > Google Earth has the elevation of this address as 5272' which is a good deal closer to your readi

Re: [time-nuts] Maser 0.7 nsec jumps solved

ning units are small and cheap (window-type), so we are trying to find the cheapest solution - and if that ends up being some ducting - so be it! Jim Palfreyman On 26 May 2016 at 13:13, Andy <ai.egrps...@gmail.com> wrote: > On Wed, May 25, 2016 at 12:59 PM, Mike Monett <timen...@binsamp.

Re: [time-nuts] Maser 0.7 nsec jumps solved

on with a big "thump". Jim Palfreyman On 22 May 2016 at 21:43, Magnus Danielson <mag...@rubidium.dyndns.org> wrote: > Jim, > > On 05/22/2016 03:58 AM, Jim Palfreyman wrote: > >> Hi all, >> >> Awhile back I posted about some mysterious 0.7 ns jumps i

[time-nuts] Maser 0.7 nsec jumps solved

huge for VLBI and for time-nuts. Jim Palfreyman ___ 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] Unix software to generate nice looking *DEV plots

to start. And it's free. As an aside, fellow time-nuts may be interested in the paper. It's mostly about timing after all. Jim Palfreyman On 17 March 2016 at 21:29, Attila Kinali <att...@kinali.ch> wrote: > Moin, > > I'm looking for some non-GUI software to generate the different

[time-nuts] Fwd: Home-brew GPSDO

ith a circuit that uses a better current source, which I can pass along if you are interested. So far the performance seems to be about the same as this simple circuit. -- --Jim Harman -- --Jim Harman Arduino GPSDO Schematic v4.pdf Description: Adobe PDF document Arduino GPSDO notes

Re: [time-nuts] Conditioning Rubidium Oscillators

e. > > > > On Tue, Mar 15, 2016 at 7:51 PM, Attila Kinali <att...@kinali.ch> wrote: > > > On Mon, 14 Mar 2016 19:56:42 -0400 > > > Jim Harman <j99har...@gmail.com> wrote: > > > > > > > > > Disclaimer: Control theory is no

Re: [time-nuts] Home-brew GPSDO

On Thu, Mar 17, 2016 at 4:38 PM, Nick Sayer via time-nuts < time-nuts@febo.com> wrote: > Anyway, my hat’s off to Jim - it’s an extremely elegant mechanism, and it > was inexpensive both in parts and board space to add. Thanks for the kudos Nick. The design is what I just poste

Re: [time-nuts] Conditioning Rubidium Oscillators

age TIC error at long time constants -- --Jim Harman ___ 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] When does NIST change to DST?

WWVB has sent the signal to switch to DST but the website has not changed yet. On Sun, Mar 13, 2016, 10:11 AM wrote: > I noticed that NIST, at http://nist.time.gov/ , is still sending standard > time. When do they change? > > John WA4WDL > > >

Re: [time-nuts] PRS 10 and serial port communication

Actually a null modem is just the device that interchanges the connections, Rx to Tx and sometimes DSR to DTR and others. The inverters are needed in this case to convert zero or negative voltage levels to positive and vice versa. On Fri, Mar 4, 2016, 6:00 PM Artek Manuals

Re: [time-nuts] PRS10 and missing serail port communication

Make sure Rx on the converter is connected to Tx on the PRS10 , Tx to Rx, and the polarity is correct. The transmit lines should be at 0 V when idle. Not sure about the PRS10, but official RS-232 requires the idle (Mark) voltage to be -3 or lower. On Thu, Mar 3, 2016, 5:00 PM Philip Zahariev via

Re: [time-nuts] Instrument BASIC

John: I looked and found many implementations of TCL. Which one is yours, and is there any documentation about using it to control instruments over HPIB? Some of the links I looked at suggest it is a general purpose language. BTW, I'm using an Ethernet to GPIB. Love it! Thanks & 73,

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

weak its frequency up and down in increments of about 0.1 ppm (about 3 seconds per year). It does this by switching in and out tiny on-chip capacitors. -- --Jim Harman ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https:

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

n for some time, with a lot of learning along the way. Of course there are always potential improvements, but the current design works surprisingly well. If someone can provide access to a good set of test gear (I am in CT), I could better quantify the performance. My latest schematic is attache

Re: [time-nuts] Newbie questions

ased on the design posted here by Lars Walenius a couple of years ago. It uses the Arduino Micro processor, which is nice because it has a second serial port. This lets it get serial data from the GPS and talk to the PC at the same time. I would be happy to post the schematics and

Re: [time-nuts] Newbie questions

gt; Figure > that you likely will read at least several hundred papers. There is a whole > statistical language that is unique to these gizmos. This is *not* a > follow a > set recipe sort of project. > Again, depends on your answer to #3. I started with a working design and code

Re: [time-nuts] Newbie questions

>> >> I have also read, more than once, statements in this forum that something >> or >> another could be had for some low, low price so why build it yourself? I >> think >> that there are several reasons, including but not limited to the >> following. >> >> 1. It is an interesting project. &

Re: [time-nuts] HP5370B & HP5345B Front-End IC Redesign Effort

Hi Mathew, As someone who just lost their stop channel, I'm extremely interested in this project! Jim Palfreyman On 23 January 2016 at 09:14, Mathew Breton <ab...@outlook.com> wrote: > I was gifted an HP 5370B with the usual problem: front-end problems, > probably due t

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

that I have. Thanks Jim ___ 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] 5370B stop trigger not working

Thanks Chris. I'm beginning to think my 5370B is heading towards a boat anchor. We (as in all time-nut owners of 5370s) seriously need to research a replacement part/circuit for the 7061/7062 parts. Jim On 22 December 2015 at 07:44, Christopher E. Brown <cbr...@woods.net> wrote: &

Re: [time-nuts] Timestamps in audio files?

On 12/21/15 3:19 AM, Tim Shoppa wrote: As an adjunct to the thread about timestamped samples of LORAN transmissions... Are there any standard consumer-type audio file formats, that support absolute time time/datestamps? Would not have to be done continuously, but something like a time and date

Re: [time-nuts] timestamps on downconverted data streams

On 12/20/15 12:17 PM, Bill Byrom wrote: Yes, you can do that. My employer (Tektronix) makes RF Signal Analyzers which sample at a high rate then use a DDC (Digital DownConverter based on decimation and digital filtering) to produce a much smaller output I/Q file at a smaller bandwidth and lower

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