Re: [time-nuts] CPLDs for clock dividers

tate. Thus, the internal state does not move the threshold of the global clock around. Output slew rate is faster than 1ns when driving into 150 ohm. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.f

Re: [time-nuts] Rb Oscillator - rather fundamental question

promise anything, I have deliberately run 1A into the protection diodes of an ATMega16 for many seconds and still had a functional part. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-

Re: [time-nuts] simple, cheap clock for the local LAN

On 04/05/2010 03:47 PM, Eugen Leitl wrote: Hi, I'm thinking about putting a local clock standard (nothing too fancy, quartz would probably do) for the local LAN so that I have more or less stable clocks when GPS is down for whatever reason. I have zero clue about time standards for the low end

[time-nuts] A weekend project

a few weeks. /Kasper Pedersen ___ 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] A different timenuts interest

constant in the cooling phase will likely make this infeasible. /Kasper Pedersen ___ 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] Reference source 1E10^8 only ...Ideas

always calibrated and ready, pocketable, instant-on source. Not to compete with something like a second hand Tbolt. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time

Re: [time-nuts] Homebrew frequency counter, need help

On 11/27/2014 03:08 PM, lllaaa wrote: > Hi guys, > I've just get my homebrew counter working. And the resolution seems 10x > better than my RACAL DANA 1992. > This counter is heavily inspired by the idea from Kasper Pedersen. > http://n1.taur.dk/permanent/freq

Re: [time-nuts] Leap Second results: cheap GPS/1PPS receivers

1.7,M,,*73 $GPRMC,00,A,5611.0120,N,00932.1094,E,000.0,136.1,010715,002.0,E,D*1F $GPGGA,00,5611.0120,N,00932.1094,E,2,10,0.8,41.2,M,41.7,M,,*79 $GPRMC,01,A,5611.0120,N,00932.1094,E,000.0,136.1,010715,002.0,E,D*1E $GPGGA,01,5611.0120,N,00932.1094,E,2,10,0.8,

Re: [time-nuts] UPS for my time rack

ck-present signal is not connected. The external-pack-present signal does make a difference when charging; Without it, it charges at 0.7A. with it, it charges at 1.5A, and the fan is on continuously. /Kasper Pedersen ___ time-nuts mailing list -- t

Re: [time-nuts] adafruit $40 GPS

ds) It is far better than others cheap navigation receivers I have tested, but it does peculiar things sometimes, such as the 60ns excursion at 2500 seconds. And I am looking for a navigation receiver at the moment, not a timing one, so this is just because I can. /Kasper Pedersen Note: The rec

Re: [time-nuts] Advice on good reception for radio clocks

rediscovered sferics, and the need for a filter that handles that. /Kasper Pedersen ___ 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] have 10MHz need 19.5Mhz

of the board is the connector and the 74HC86 in DIP. I don't know what my varicap is, it came out of an old gps receiver. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/li

Re: [time-nuts] Computing GPS Distance Error in Time

down another rabbit hole if I can avoid it. > I have stuck my fingers in the timekeeping code in the kernel, and managed to get away unscathed. If it is not too complicated, and interesting, shoot me a mail directly. I reserve the right to decline, and the r

Re: [time-nuts] Happy Holidays

e could possibly misread your description as suggesting converting the reset voltage first) and before rearming - that way drift doesn't creep in while waiting for the edge. The charge redistribution adc would have been good, true, but there wasn't one in my junkbox. /Kasper Peders

Re: [time-nuts] DSP WWVB Receiver Idea

erter. The one above was built with what was available in the junkbox at the time. /Kasper Pedersen ___ 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] Heated crystal? & Rb tube corrosion (FE-5680A)

magnetic properties to the case. Posting to nuts is dangerous:-) So far the page has had 243 non-bot visitors, 20 people downloaded all the full resolution images, and it cost me 10GB this week. An impressive figure considering the topic. /Kasper Pedersen _

Re: [time-nuts] Ebay FE-5680A Rb: Are they that good?

It has been quite useful, moreso since I put it in a rugged box. /Kasper Pedersen ___ 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] Thunderbolt? (re simple gpsdo.)

iscovered that some of the microcontrollers in the drawer would do nanosecond capture all on their own, but with a working tbolt, need has been lacking. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://w

Re: [time-nuts] GPS Splitter

in than the tbolt likes) with it in series. The N-covers it comes with are just covers, not terminators, so I suspect it to be the high-iso (+10dB) version. I have not yet actually measured the gain, work's generator stops at 1GHz so I need to build a doubler fi

Re: [time-nuts] GPS Week 1536 causing problems?

s RXD tied hard to ground (nothing speaks to it). They did share windowsill, and it hasn't rained. Anyone else lose an 18x? /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/m

[time-nuts] GPS 18x death and resurrection - was: GPS Week 1536 causing problems?

ompressed air. The magnets are glued on from the inside, there's nothing on the outside. (and on a side note, the tiny little TCXOs in them are both ~1.4 ppm low) /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscrib

Re: [time-nuts] Reference oscillator accuracy

t;How much? What does it take to measure it? What do I need to build?" http://n1.taur.dk/dcf/ (raw data and plots, time is UTC+1) I am no more than 6-700 km north of DCF77, and get ~5us p-p. Now that is quite large, when I started out that number seemed a lot smaller. /Kaspe

[time-nuts] power line common view - a silly experiment

al refclock, if anyone wants to play with this. /Kasper Pedersen ___ 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] 4 KV Power Supply Recommendations

ked with ISM was 50mW/cm2 - the point at which I have already left, and the point where the heating of the lens in your eye becomes a problem. Of the permanent kind. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] GPS ceramic patch in what plastic housing?

te above that, and with an air pump and heat gun I pulled the PC down around it. A bit of white paint on the inside, and it looks really good. /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com

Re: [time-nuts] A real-world precision timing need....

tions. In the process you get the clock offsets of each of your stations. Subtract this out before post processing. 25 usec should be achievable, 25us*3200f/s=0.08f Very similar to something called 'GPS'. Only using NIR light. /Kasper Pedersen On 10/31/2010 01:56 PM, Michael Baker wr

Re: [time-nuts] GPS USB dongle for time server

und excessively. This unit is decapsulated and sitting indoors. /Kasper Pedersen ___ 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] Linux timekeeping / jiffy source

es the gain of adjustments. Thus, when you (or ntpd) ask for 1ppm trim, you get 1.000127 ppm trim. Also, my comment about this starting with 2.6.32 is false, it affects much older kernels too. /Kasper Pedersen *as defined by time-nuts. ___ time-nuts m

Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC

/gps18x-350-pps.jpg Note I am running 115200, not 4800 3.00 kills itself. I had 2 die simultaneously. 3.10 starts transmitting 350ms .. 480ms after PPS 3.30 starts transmitting 920ms .. 1220ms (!) after PPS 3.50 starts transmitting 700ms .. 1220ms (!) after PPS /Kasper Pedersen

Re: [time-nuts] advice: frequency calibration to 1 ppm possible without GPSDO?

his is too cumbersome and buy a GPS with pps output, you could make it self-adjusting: http://n1.taur.dk/simplexdo/ /Kasper Pedersen ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo

Re: [time-nuts] 50/60 Hz clocks

outputs of an 8 pin part to get a phase-centered PWM with half the usual ripple. With PPS input as a bonus so the zero crossing occurs where you want it to. http://n1.taur.dk/gen60a.jpg Output 5Vpp@60Hz +1.1mVpp@39kHz. Very pretty sinewave. // TinyAWG.c // 60Hz generator - 2011 Kaspe

Re: [time-nuts] 60hz disciplined watch

in that plot is also 5 days in a row where the frequency is 230ppm high. /Kasper Pedersen ___ 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] 60 Hz measurement party

://n1.taur.dk/plcv/ (with pretty plots. Posted to 'nuts 1.5 years ago) The two sites were on different 60kV radials, but within the same city. I wonder what fun things one might deduce by watching the difference in phase across the continent? /Kasper Pedersen The files on the site are pretty ol

Re: [time-nuts] Three Phase Power

lanker, still works. So I do not like 'smart' meters. /Kasper Pedersen ___ 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] 60 Hz measurement party

role of killing RF, and compensating for the H->L threshold of the HC14. It sits on the hot side, and charges up through the protection diodes for the next 200us pulse. It will drive 10m of POF. Substitute an opto coupler of choice if you need less is

Re: [time-nuts] SLIP vs Ethernet for NTP

on ethernet. Either poll quickly enough that the entry stays cached, or set them static on both ends. And beware of windows boxes. I did the same experiment across work's network: http://n1.taur.dk/ethertest/ The right answer is obviously to connect the

Re: [time-nuts] FE 5680A Warning

iny nudge to C217 and it is happy, the output should sweep to about 4ppm high. I suspect the PTC element on the xtal is dodgy too; It seems slower to settle than the other units. http://n1.taur.dk/fe5680a-2/ I figured they might be useful when trying to point out components an

[time-nuts] quick and very dirty phase comparator

nuts/phasehex2dec_win.zip I'm aware that 600ps is a very large figure in a lot of cases but for my oscillators it's good enough. /Kasper Pedersen. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi

Re: [time-nuts] Near-perfect chip for Loran-C frequency receiver

rontend and I/Q mixer, and uses this for compensation. DCF77 does wiggle quite a bit at dawn, plus there is the occasional 1us phase adjustments at the transmitter end. http://n1.taur.dk/dcf/(~100km NNW of PHK) I recall having seen better than this with Lor

[time-nuts] bounce - apologies

I must apologize for screwing up the mail server configuration. I do not believe in generating replies to usually falsified addresses. And I'm also rather confused as to why it happened now, and not a lot earlier. To make it short, it is supposedly fixed. /Kasper Ped