Re: [time-nuts] Conducting Bench Top Material

rdwood-floor-boards and a painted steel profile on the front that I make point out of touching before sticking my fingers into any sensitive circuits. Works for me. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

In message <20100125.140436.3508.5.cdel...@juno.com>, Corby Dawson writes: >Most manufacturers no longer make polycarbonate capacitors. The advent of CD's made polycarbonate ridiculously expensive and priced them out of the market... -- Poul-Henning Kamp | UNIX since Zil

Re: [time-nuts] Low temperature coefficient capacitors for DMTD

and, currently meet established reliability failure rate level "R." Have you connected the dots yet ? A fair number of the in-stockpile nuclear weapon designs are qualified using polycarbonate capacitors and can't be retested, redesigned or requalified... Poul-Henning

Re: [time-nuts] Conducting Bench Top Material

at performance of that problem. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explaine

Re: [time-nuts] Conducting Bench Top Material

.99% of our problems, environmental or otherwise. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can a

Re: [time-nuts] Conducting Bench Top Material

ds/society/content/232.png It's called "JAN SJÖ" here, not sure if they use that name in other geographies. Highly recommended. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe

Re: [time-nuts] [OT] Ikea Lamp

table with cutting the wire and splicing it again, you can mount it on anything you can drill a 10mm hole in... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what

Re: [time-nuts] [OT] Ikea Lamp

In message , "Bob Camp" writes: >Where is the AC to DC conversion done? In a lot of these it's in the base. In the tiny wall-wart. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4

[time-nuts] More IKEA hardware...

http://wiki.eth-0.nl/index.php/LackRack (Please try to avoid a long wandering thread on this one...) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can

Re: [time-nuts] LORAN C update

shouldn't be too hard to make a 4-digit gri modification, but I never bothered and built my own SDR loran-C instead, shipping my 2000C of to somebody in .NL who wanted to give it a shot. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP

Re: [time-nuts] Symmetricom Announces Commercial Time-Scale System

In message <4b73b011.5070...@murgatroid.com>, Christopher Hoover writes: >fyi. -ch. > > > Symmetricom Announces Commercial Time-Scale System I'm pretty sure this is just timing.com's product that gets a new outing... Poul-Henning -- Poul-Henning Kamp |

Re: [time-nuts] Loran C sounds

h between hard facts and abstract objectives. Fact: GPS is no less vulnerable because US is at war. Abstract Objective: It would screw them badly if it breaks. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD s

Re: [time-nuts] Loran C sounds

In message , Neville Michie wri tes: >We had a system of secondary radar called DME [...] DME is still going strong, and is the main GPS-Backup over Europe for air-traffic. >I do not know how shipping located themselves. Possibly Omega... -- Poul-Henning Kamp | UNIX since Zilo

Re: [time-nuts] Loran C sounds

In message , Bob Camp writes: >Hi > >I wonder what just the electric bill is to keep a single chain (4 >transmitters) up and running? http://phk.freebsd.dk/photos/L9007M/dscf0458.jpg.html Looks like 40kW for a dualrated transmitter like Eidí -- Poul-Henning Kamp

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

sic physical frequency, like the cesium standards, but it is an atomic frequency, and it is an atomic clock (if you attach a display or a pair of hands :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD sin

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

o anything to >the signal first, to get it closer to the 5V logic level. No experience with Atmels, but Microchip's PIC18 work OK, but you may have to AC-couple the signal and bias it to 1.mumble volts with a couple of resistors. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@f

Re: [time-nuts] Primary Standards...

e. The way to find out if your new invention has a chance to become a primary clock, is to build N of them, turn them on, and see if they all find the same frequency once they are locked, if they do, you're on your way to become famous. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@fr

Re: [time-nuts] Low noise voltage regulators

trivial transistor or op-amp will do. If you really want to go radical, take a peek at Nationals AN1651, study the two opamps at the top of the schematics... Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

[time-nuts] Loran-C (?) antennna in low sun

I stumbled over this picture from Jan Mayen: http://www.jan-mayen.no/nyhet/2010/01_januar/januar/crossfox1b.jpg I'm not entirely sure if it is their Loran-C transmission antenna, but it is a damn good picture whatever the antenna does... Poul-Henning -- Poul-Henning Kamp |

Re: [time-nuts] What FreeBSD version for Soekris net4501 NTP server?

. I would take a 7.x or 8.x version at this point. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be expl

[time-nuts] Don't buy that eBay quarsar...

http://arxiv.org/abs/1004.0115 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence

Re: [time-nuts] Very unique clock

why the industry is howling madly at OLED btw. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately b

Re: [time-nuts] Microphonic Inductor?

nored, but I wouldn't be surprised if it showed up for time-nuts... Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be

Re: [time-nuts] And you thought you were old

er, and if you happen to have a stash of OC71's laying around, we would happily take them as a donation :-) Poul-Henning http://datamuseum.dk/site_dk/rc/gierdoc/ http://datamuseum.dk/site_dk/rc/giersimulator/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org |

Re: [time-nuts] Simulating Oscillator Noise: DifficultiesSimulatingFlicker FM Noise

t;time. It's not always been "easily available". These day it is: ftp://minnie.tuhs.org/UnixArchive/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to m

[time-nuts] The USCG really wants to bury Loran-C

ating and at risk of collapse. http://news.bbc.co.uk/2/hi/americas/8653754.stm -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompe

Re: [time-nuts] The USCG really wants to bury Loran-C

In message <4bdb0889.9090...@rubidium.dyndns.org>, Magnus Danielson writes: >On 04/30/2010 06:06 PM, Poul-Henning Kamp wrote: >Besides, its a perfectly viable excuse to follow up on Bob's point... >it's fun to blow things up. Just the footage indicates that they enjoyed

Re: [time-nuts] The USCG really wants to bury Loran-C

In message <4bdb13b3.9080...@rubidium.dyndns.org>, Magnus Danielson writes: >On 04/30/2010 07:17 PM, Poul-Henning Kamp wrote: >> I wonder if they did a "last verification" on their cold war evacuation >> instructions ? > >I don't think the antenna mast

[time-nuts] neon/nixie clock

Can't recall this clock been mentioned on timenuts before: http://wwwhome.cs.utwente.nl/~ptdeboer/ham/neonclock/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice

Re: [time-nuts] For your museum only Loran-C monitor

In message , "Pet e Lancashire" writes: >so who has their own local Loran-C that covers the neighborehood ? The funny thing is that it would pretty legal to do so, at least here 100kHz is one of the bands where you can make noise at low energy without getting into trouble. -- Poul

Re: [time-nuts] Most accurate small crystal

it properly tonight. Being able to model the clock of each device precisely is a very important part of the security of these devices. The important part there, is that the clock runs at a constant rate, but the exact value of the rate is not important, as long as the bounds are known. -- Poul-

Re: [time-nuts] Most accurate small crystal

In message <1077d2d627854b88925e3b90063ac...@vectron.com>, "Bob Camp" writes: >Where do you want to start? Isn't that HP/Agilent App-Note with the three wrist-watches the place to start ? 1289 or something ? Poul-Henning -- Poul-Henning Kamp | UNIX

Re: [time-nuts] GPS Sat Clock Data

abase is "off limits" to civilians. Signal In Space quality is monitored using some of the low-orbit "assets". -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Nev

Re: [time-nuts] Comments on Tbolt deal?

In message <90f3b.769add12.393ba...@aol.com>, gandal...@aol.com writes: >Another Chinese seller worth considering is Bob Mokia who sells on Ebay as >fluke.l, Speaking of which: Has anybody tried the GPS/Glonass receivers he has for sale ? -- Poul-Henning Kamp | UNIX sinc

Re: [time-nuts] Dallas NV-SRAM replacement? (in 3458A)

ore. But from a functional point of view: no. You can read out the memory with the undocumented "MREAD" command, but the CALRAM is protected by various tricks, so you cannot just use the MWRITE command to restore it. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd

Re: [time-nuts] pm - re: Dallas NV-SRAM replacement? (in 3458A)

with an eprom-programmer, and then rewrote >them, or simply replaced? I read and wrote them with a eprom-programmer, that was the easiest... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tah

Re: [time-nuts] UTC and leap seconds

In message <815517.110281276250464575.javamail.r...@wmail51>, "iov...@inwind.it " writes: > >I was wondering, why we assume that Earth's rotation is slowing down, instead >that clocks are speeding up? Because we can measure it relative to the position of very dist

Re: [time-nuts] UTC and leap seconds

In message <20100611102543.67641136...@hamburg.alientech.net>, Mike S writes: >At 06:03 AM 6/11/2010, Poul-Henning Kamp wrote... >I assume you mean use a clock to measure the earth's rotation, using >quasars as a positional reference. That's circular logic. Obviously,

Re: [time-nuts] crystal oscillators & TPLL

t in any PLL really, really, really mucks the math up in that respect. With that said, I'm really, really, really sick and tired of this TPLL thread. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer |

Re: [time-nuts] crystal oscillators & TPLL

gt; >Sorry, I though that was obvious. Yes, you probably did. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can

Re: [time-nuts] crystal oscillators & TPLL

desire to have further correspondence with you. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be exp

Re: [time-nuts] EFC tracking

the fence. The major problem with using sound ADC's is that their references has absolutely no long term stability, so you will see your EFC wiggle and wander all over the place, even when it stays perfectly still. I would find one of those cheap-ish DVM's with a serial or USB port... --

Re: [time-nuts] EFC tracking

igital converters and their ailments: go for it. If the objective is to measure the EFC voltage over the long term, hit ebay, find instrument built for such purposes and move on. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] DS-1 from 10MHz

; >___ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nu= >ts >and follow the instructions there. > -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p..

Re: [time-nuts] Austron 2100 going...

In message <4c4daa05.2000...@verizon.net>, Dan Rae writes: >I have a now useless 2100 Loran receiver / comparator here, does anyone >have any use for this? Before I recycle it. (Here is southern California.) Is it the Frequency or the Time version ? Does it do 4-digit GRI ? --

Re: [time-nuts] Updated Shera controller

ant to use the still-smelling-like-brand-new-car PICTIC II with a good DAC and a microcontroller ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequa

Re: [time-nuts] Updated Shera controller

not very good when stop pulses arrive BEFORE start >pulses which is a normal condition if a average time interval of zero >between local pps and GPS pps is the aim. So configure it to use a standard offset of one Xtal/Rb period ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...

Re: [time-nuts] HP 5335A and HP-IB (GP-IB)

re, it cannot be patented". Poul-Henning PS: Not only am I not a lawyer, I am not even an USAnian :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequat

Re: [time-nuts] HP 5335A and HP-IB (GP-IB)

e full roar on this, is that lawyers treasure their vacation. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explai

Re: [time-nuts] pc clock crystal long term variations

requency estimate and you can see this clearly. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately

Re: [time-nuts] pc clock crystal long term variations

ect that is the interesting number to compare with. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained

Re: [time-nuts] Remove Pictic boards from envelopes

HS. Pantone was not at all amused for instance. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequ

Re: [time-nuts] Divide by five

s with that, and as we speak I'm developing a new algorithm which at least so far, gives much superior performance. You can read my musings about this here: http://phk.freebsd.dk/time/20141107.html My goal is to release the new NTP client before X-mas. -- Poul-Henning Kamp |

Re: [time-nuts] Divide by five

In message , Paul writes: >You're saying these documents affirming clock combining are wrong? Or have >I gone terribly astray? I'm saying that with NTP there is plenty of room between theory and practice :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

[time-nuts] future NTP programs...

later again S1 servers. But the target right here and now is clients only. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequa

Re: [time-nuts] Divide by five ->Ensemble

s, not low microsecond packet delays. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___

Re: [time-nuts] DIP Is Dead R.I.P

nalog 8-pins in a PSU which likely had a traumatic childhood. It's not like this is a major problem in the first place. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute

Re: [time-nuts] future NTP programs...

control algorithm may not map well into its datafields. Time will show... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to

Re: [time-nuts] Divide by five

high-quality frequencies. There used to be an academic paper on timing.com's home-page about their clock-ensemble algorithm called something like "Advances in Time-Scale Algorithms". It's not super detailed but it was certainly a much better place to start than NTP source or docu

Re: [time-nuts] future NTP programs...

65722434 [] 0.0.196.133123 no 3 3 0 0 0 -0.180700990 [] 0.0.16.190 123 unk 3 3 0 10 -6 -0.520566284 [] 0.0.68.26 123 no 3 3 8 6 -180.345824138 [CHU_AUDIO#1] [...] IP numbers obfuscated to protect the incompetent... -- Poul-Henning Kamp | UNIX si

Re: [time-nuts] future NTP programs...

are remains to be seen, but it is very likely to involve a CLI interface and possibly a shared memory state Pretty much like Varnish ... feel free to wonder why ? :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | B

Re: [time-nuts] future NTP programs...

long esterror; /* estimated error (us) (ro) */ }; These have the following meaning: time Current time (read-only). maxerror Maximum error in microseconds (read-only). esterror Estimated error in microseconds (read-only). -- Poul-Henning Kamp

Re: [time-nuts] future NTP programs...

les the crypto stuff or the control packets in a root-process, those should go in a sandbox. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately b

Re: [time-nuts] Divide by five

enough clocks for it to be worthwhile, and the cooling in my lap couldn't cope with me turning so much kit on at the same time during summer. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-ta

Re: [time-nuts] strange carrier

ce in NTSC ? >> at a frequency of 59.99240 kHz. I have researched on Internet what it might -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately b

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

but don't make it too thick since it insulates quite well, and paint the surface to bind the dust. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute t

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

In message , Bob Camp writes: >At least one side / corner is well buried in the ground But be aware that such a corner may be dry only when empty. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer |

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

x27;t work, I said that I don't agree with it ;-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequatel

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

time the source returns unusably low temperature and must be abandonned. Typically after 25-30 years. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can ad

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

to overprovision by a factor two to be on the safe side, afterall it only costs EUR7 for each extra meter of pipe. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never att

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

lot for ground heating, both in terms of Sun radiation angle and length of winter. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained

Re: [time-nuts] LTE Lite SkyTraq chip info

n used by others.. That reminds me: I have yet to see anthing that uses Galileo or GNONASS in a position-hold mode, are those constellations still not competitive with GPS in that niche ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since

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

a good sync clock for your telco network. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _

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

have never had hands on, I've only pointed to it as a possible solution in a couple of cases. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequa

Re: [time-nuts] ***SPAM*** Oncore m12+t PPS sawtooth correction board.

With the jitter the switch gets "smeared" out over a longer period of time, which is a more sensible input to a PLL. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attr

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

e. This is the absolutely most likely scenario. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained

Re: [time-nuts] HP 5370A to B conversion

>board works on either version. The only differene in the software is a single byte fix for an obscure race-condition. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attrib

Re: [time-nuts] Cheap 5370A on eBay

In message <766218c3-5ac3-4189-899b-916858f1f...@n1k.org>, Bob Camp writes: >A *lot* of errors on the 5370’s (A or B) can be traced to a couple of fairly simple issues: 4) (E)PROMS loosing their memory. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@fr

Re: [time-nuts] Cheap 5370A on eBay

and merged the data into a single EPROM. One detail to be aware of if you do this, is that the HP5370 uses inverters as address line buffers. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe

[time-nuts] New NTP client software (preview) released

I have just put the first preview release of my new NTP client software up on github. https://github.com/bsdphk/Ntimed You can read more about it here: http://phk.freebsd.dk/time/ We'll see where it goes from there... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3

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

In message <54a20c7c.7040...@skybase.net>, Tim writes: >Not knowing much about the PRS10, I'm just wondering if its worth the ri$k :) You need to hold that price up against the fact that a new PRS10 is $1600. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p.

[time-nuts] FOSDEM 2015 has a time-track

FOSDEM is an Open-Source gathering once a year in Bruxelles, and this year there is a track dedicated to time: https://fosdem.org/2015/schedule/track/time/ Those of you of an european persuassion may find it relevant... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining

amatic as that text claims: +/- 5% were a very common specification. Driving the 30Hz reed with a pendulum clock would trivially do this. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never a

Re: [time-nuts] (no subject)

terms are themselves very temperamental because they, by definition, amplify measurement jitter noise. In the precision time/frequency domain, D-terms are almost never realiastic. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD commit

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

"auto-tune" button these days which does exactly that: Inject a heat-pulse, see what happens, do math... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice wh

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

.org/wikipedia/commons/b/b1/On_Governors.pdf >> >> definitely more than P controllers.. I said "Almost all"... :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD

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

In message <20150206153214.4d5f42edbdda4639fee1a...@kinali.ch>, Attila Kinali w rites: >On Mon, 26 Jan 2015 20:15:12 +0000 >"Poul-Henning Kamp" wrote: > >> The basic math of PID has been around for about 100 years. The invention >> of the servo (an

Re: [time-nuts] MSF Scheduled Maintenance Periods

r setup? The most likely explanation is a switch-mode power-supply in the local environment. 60kHz is a very popular choice of switching frequency. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-taho

Re: [time-nuts] new tdc from Texas

sulting frequency. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nu

[time-nuts] Obscure HP T/F instruments in ebay.fr

Reference 311307936107 HP 5275 Time Interval Counter There may be more... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by

Re: [time-nuts] Obscure HP T/F instruments in ebay.fr

r than 50% hit rate getting S&H reduced. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by

Re: [time-nuts] Obscure HP T/F instruments in ebay.fr

t;Can anyone confirm? No idea, but that would be a plausible explanation. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adeq

Re: [time-nuts] Obscure HP T/F instruments in ebay.fr

and I suspect we will see more and more former HP employees start to take an interest. We see this effect very clearly at the danish computer history museum where I'm active (datamuseum.dk) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] 53230A noise floor

EV of the measurement versus time and you will discover that the noise floor is not even close to being even. If you find a particular good spot and want to use it for measurements, the way to go is to tune the length of the cable for EXT REF (or use a tweakable delay line) -- Poul-Henning Ka

Re: [time-nuts] 53230A noise floor

to alert Anders that what he has measured is not what he think he has measured. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be expla

Re: [time-nuts] [volt-nuts] The Art of Electronics

In message <20150417074427.ga31...@sol.ermione.com>, Andrea Baldoni writes: >Hello. >In the case someone missed the new, after years of waiting, the third edition >of the book in the subject is out! I received it last week, and yes, it's absolutely worth the money

Re: [time-nuts] Important parameters for a GPS/GNSS antenna

In message , "Tom Van Baak" writes: >When you post-process raw GPS data you get to include antenna phase >center / gain / az/el corrections for free. Speaking of which... I wonder if anybody ever made a rotating GPS antenna to average out the X-Y phase-center offset ?

Re: [time-nuts] Tour of METAS (Swiss Federal Institute of Metrology) time lab: any questions or requests?

In message <7fa86d93-1c83-4fe8-84a0-ddb7a542a...@n1k.org>, Bob Camp writes: Ask them how/why the HBG transmitter screwed up the 2006 leapsecond ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD

Re: [time-nuts] Tour of METAS (Swiss Federal Institute of Metrology) time lab: any questions or requests?

In message <554b6547.5070...@burnicki.net>, Martin Burnicki writes: >Poul-Henning Kamp wrote: >> Ask them how/why the HBG transmitter screwed up the 2006 leapsecond ? > >If I remember correctly then the transmitter would have needed to be >overhauled, which would

Re: [time-nuts] Important parameters for a GPS/GNSS antenna

so that the stress is converted from torsion to longitudal tension and you'de don. Doing continous rotation may not even be a good idea, rotating 90 degrees every hour is probably a better idea from a processing point of view, as that wouldn't need special software. -- Poul-Henning

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