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

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-bin/mailman/listinfo/time

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

[time-nuts] A weekend project

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

to be an 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] GPS ceramic patch in what plastic housing?

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/cgi-bin/mailman/listinfo/time-nuts

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

, 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 Loran? /Kasper Pedersen

[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 Pedersen

Re: [time-nuts] DSP WWVB Receiver Idea

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] have 10MHz need 19.5Mhz

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/listinfo/time-nuts and follow

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

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 right to give up:-) /Kasper Pedersen

Re: [time-nuts] GPS Splitter

) 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 first. /Kasper Pedersen

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

, 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] GPS Week 1536 causing problems?

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/mailman/listinfo/time-nuts and follow

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

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 unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] Reference oscillator accuracy

? 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. /Kasper Pedersen

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

, 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

- 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 https://www.febo.com/cgi-bin

Re: [time-nuts] CPLDs for clock dividers

, 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.febo.com/cgi-bin

Re: [time-nuts] FE 5680A Warning

, 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 and test points. /Kasper Pedersen

Re: [time-nuts] Heated crystal? Rb tube corrosion (FE-5680A)

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 ___ time-nuts mailing

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

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.)

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://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

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

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

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 mailing list

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?

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/time-nuts

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

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 Kasper Pedersen

Re: [time-nuts] 60hz disciplined watch

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

/ (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 old. I still have

Re: [time-nuts] Three Phase Power

' 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

, 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 isolation. /Kasper Pedersen ___ time-nuts

[time-nuts] quick and very dirty phase comparator

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-bin/mailman/listinfo/time-nuts

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/frequencymeasurement.pdf

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

,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,2,10,0.8,41.2,M,41.7,M,,*78 /Kasper Pedersen

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

-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 -- tim