Re: [time-nuts] DDS'ery

In message 4dff5d29.2070...@mail.ua.pt, Luis Cupido writes: Isn't it the very same thing as just using the most significant bit of the accumulator. Indeed it is, and that's how programmable digital clocks often work. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] DDS'ery

is a lot lower than you get from squaring the sinewave. -- 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] Bob Pease

In message 4dff5c52.4070...@erols.com, Chuck Harris writes: One important thing to note is he wasn't wearing his seat belts. Does a 1969 VW Beetle even have them ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Replacing electrolytics - any disadvantages of high temp ones?

of the capactors. There are many capacitors on the market these days with 5000h or even 2000h rated life. That is 7 or 3 months respectively. And yes, it should be criminal to manufacture and sell those. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956

Re: [time-nuts] Low noise power supply recommendations

' resistance causing higher current than was good for them. -- 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] Advice on NTP server needed

users, load averages: 0.20, 0.16, 0.10 As far as I know, the NET4501 is still undisputed king of the NTP hill. -- 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] locate 6 digit digital clock

power-glitch. -- 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-nuts

Re: [time-nuts] locate 6 digit digital clock

to do what you want with a little reprogramming: http://www.kabtronics.com/ -- 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] Pitfalls of Digital 'Scopes

In message 43ecea5a-3360-43c0-9521-ea8b6598b...@mninter.net, KD0GLS writes: You may find the peak detect function in the acquire menu useful. And be particular careful with the hi-res function (like peak only it averages all the oversampled samples) -- Poul-Henning Kamp | UNIX since

Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

-synchronized systems only spread in the last approx ten years, and the first leap second after that happened was five years ago. This is a problem that will only get worse as more and more systems are modernized. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

[time-nuts] DS3231 a clear winner

inside a 1PPM band at practically no power. Highly recommended. 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 explained by incompetence

Re: [time-nuts] 60hz disciplined watch follow up

that they are using this method. Not to mention that 120Hz is a pretty high frequency for a solar cell. -- 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] 60hz disciplined watch

times, and the phase any one lightbulb is on is random between 0 and 360 degrees. (due to three phases and transformer-design) -- 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] 60hz disciplined watch

in the privatization of the grid: Nobody was charged with paying for the extra power needed to capture lost cycles, so now they just try to keep it close to 50.0Hz and don't care about the integral. I would be surprised if it were any different in USA. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] 60hz disciplined watch

related to doing that are enormous. -- 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] HP 3314A ROMs

-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-nuts mailing list

[time-nuts] Speaking of precise 32.768 kHz based clocks: DS3231

... But, the _really_ neat thing is that it has an Xtal aging register, where the capacitive loading can be tuned, obviously necessary in the absense of an external trimmer. A quick test indicates that this happens in steps of roughly 0.05PPM Highly recommended... -- Poul-Henning Kamp | UNIX

Re: [time-nuts] PIC processor CTMU module used for sub-ns TIC applications?

breadboard anyway, but failed to get reliable results. If you want to play with it, I suggest you make an actual PCB and clean/coat it very carefully to avoid leaking current or electrostatic fields. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] Selecting a used HP sweep/frequency generator

. I have had to do that on a couple of other types of HP gear. I also put copies of eproms on Diddiers site for everyone. It is sometimes possible to read otherwise lost eproms by manipulating their temperature downwards. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Selecting a used HP sweep/frequency generator

, but it is always worth keeping an image. Yes, absolutely, I have made it routine to copy eproms when I have my kit open these days, I can only recommend everybody else do the same. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Selecting a used HP sweep/frequency generator

In message BANLkTi=upy4x2wumn9rpaw-vreu4yw3...@mail.gmail.com, Bob Bownes wri tes: The candidates at present are the 3324 and 3325. Don't overlook the 3336. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD

Re: [time-nuts] Portable standard

too much air flow will be a problem. Don't underestimate the thermal mass of the SLA batterieies, if you put them inside the insulation, you will have a much more stable temperature. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

Re: [time-nuts] Portable standard

batteries in backup applications: http://www.battcon.com/ArchivePapers.htm -- 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] SI Unit Problems

there is to that. But his rant about the Candela is spot on. -- 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] WWVB Measurements using DSP recovery

... -- 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-nuts mailing list

Re: [time-nuts] WWVB Measurements using DSP recovery

msec for the window, allowing any frequency divisible by 500 Hz to be measured. Now arguably, there are a lot less usable signals than one would dream of, but that does not distract from the fact that this is an incredibly cheap and usable frequency/phase VLF receiver. -- Poul-Henning Kamp

Re: [time-nuts] improved WWVB signal being planned?

be of interest, but I wonder if anyone would make one commercially. Meinberg already have them for DCF77. It's not tricky to build one yourself. -- 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

Re: [time-nuts] WWVB Measurements

can design some proper hardware for this, so that we can have an VLF-All-band Time/Phase Receiver, basically a receiver you can ask, at any time, What is the phase of the signal at N kHz, for any value of N you care for. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] GPS Usage

that was aiding terrorists ? The reason LORAN-C got killed was that DoD/DHS couldn't jam it if a terrorist with a suitcase-nuke was trying to find his way to Congress. Your government money at work... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since

Re: [time-nuts] GPS Usage

on minuted notice. -- 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

Re: [time-nuts] GPS Usage

indirect GPS users, By far the biggest one is cell-phone base stations, and since these don't work without good timesync (See recent story about the Koreas) I think it is fair to include the indirect users in the collateral damage. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] GPS Usage

DHS, the same people who want to see your junk in airports, what makes you think there is an analysis and not just security-theater involved ? Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since

Re: [time-nuts] Where does the VXI E1740A fit in ?

in multiple directions. Timing wise, they will do all of the standard stuff (AVAR, MTIE, TDEV etc) at 5370(?) type resolution. Is there any register-level programming information for them ? If so, putting an open source UNIX on the VXI PC should be possible... -- Poul-Henning Kamp | UNIX

[time-nuts] HP 59300-10001 Tape with service programs

contains a lot of verification programs for all sorts of TM kit, and obviously, lacking a HP9825 I would need to either get a listing or, preferable, a machine readable copy. Anyone ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

Re: [time-nuts] HP 59300-10001 Tape with service programs

itself. -- 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-nuts

Re: [time-nuts] OT: NZ Christchurch member

on average. -- 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-nuts

Re: [time-nuts] Earthquake meets time ball

In message AANLkTi=6V+Gwa_o-Z9YXkar5TKzPvGoQc9tLTkOOQ=y...@mail.gmail.com, Stev e Rooke writes: Keep smiling Steve, and let us know if we can do anything for you. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] HQ 5370B manual available

In message bay146-ds7333cc389be80d00e9e94b2...@phx.gbl, Roberto Barrios write s: Beautiful job Roberto! Thanks a lot! 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

Re: [time-nuts] Rom Expansion for HP5370B

wanting to look at the firmware can use the PyRevEng project I have made on github. You just need a HP5370B rom image (google is your friend, if your memory fails you) and a python runtime and you're all set. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP

Re: [time-nuts] Rom Expansion for HP5370B

-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 explained by incompetence. ___ time-nuts

Re: [time-nuts] Rom Expansion for HP5370B

particularly clever parents?... I can confidently say that my mom had not even heard about, much less seen a seven segment display at the time I was born. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3

Re: [time-nuts] Rom Expansion for HP5370B

In message 920772.7182...@smtp103.prem.mail.sp1.yahoo.com, Scott Newell writes: At 08:50 AM 2/19/2011, Poul-Henning Kamp wrote: I've had similar (like maybe a Luminary ARM + ethernet) thoughts. I wasn't sure if the firmware was simple enough to be re-written so that the entire CPU section

Re: [time-nuts] Rom Expansion for HP5370B

don't know the Propeller well enough, but I would doubt 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 adequately be explained by incompetence

Re: [time-nuts] Rom Expansion for HP5370B

is that you only have one N0 counter and presumably you would need two to ping-pong between the two inputs. Poul-Henning PS: let me know if there is anything I can tell you about the firmware. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956

Re: [time-nuts] Rom Expansion for HP5370B

In message 4d61de84.3050...@xtra.co.nz, Bruce Griffiths writes: Poul-Henning Kamp wrote: In message466fdfc184a3469eac08eee5ee36c...@hm.clpa.com, Bob Camp writes: Is the CPU strictly an I/O machine or does it do any of the timing for the counter? All the counting is hardware

[time-nuts] Rom Expansion for HP5370B

with built in allan-variance calculation, anyone ? No, I don't have the time, but if I had... -- 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] 2nd 5370B

to avoid ground-loops and that means laptops with batteries that can hold up for how ever long your measurement is going to take. Better quality USB instruments, like Agilents Power Sensors do not seem to suffer from this, but much of the low-class stuff does. -- Poul-Henning Kamp | UNIX since

Re: [time-nuts] 2nd 5370B

something more streamlined, there are a lot of ADC+USB gadgets on the market, most of them very overpriced, but with better signal-conditioning than the raw electronics on Arduino and some of them even calibrated to some extent. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] HP 5372A vs. 5370A

was to slow for much of that, and decided to the that stuff on the VXI bus instead... But that reminds me: do we even know how many different software versions there were for these beasts ? Which software versions do people have on their HP537[123]A ? My HP5372A is 2947 (08 Dec 1989) -- Poul-Henning

Re: [time-nuts] 2nd 5370B

as Power Up. But since both are complete and look fairly clean, not really complaining. Check the ext/int clock switch. Anyone ID this language ? Looks like thai or vietnamese. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] HP 5370B manual - missing page

In message bay146-ds4f2c6323b4ea3f3ad2f96b2...@phx.gbl, Roberto Barrios wri tes: I belive the pdf file is made from my manual, so presumably that part of the page should still be physically in it, so if nothing else I can scan a copy of that... -- Poul-Henning Kamp | UNIX since Zilog Zeus

Re: [time-nuts] HP 5372A vs. 5370A

for instance this app-note: http://cp.literature.agilent.com/litweb/pdf/5952-8006.pdf -- 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] HP 5370B manual - missing page

In message bay146-ds4f2c6323b4ea3f3ad2f96b2...@phx.gbl, Roberto Barrios wri tes: I belive this is the bit you are missing: http://phk.freebsd.dk/misc/hp5370b-p8-99.pdf -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Calculate spectral content from a series of zero crossing time stamps?

for me to be able to see how you transform the resulting phase-deviation spectrum to a normal frequency offset plot, but a few tests with synthetic data should tell you that. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] an interesting problem

measurements in these discrete values, do that, and calculate stats for all bins with sufficient data points to say something meaningful. -- 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] An (unknown?) nasty feature of the DDS principle for time nuts applications

of the accumulator. However, don't overlook the value of a small frequency offset, which, if used correctly, can be used as a 'vernier' to discover minute unlinearities in timing circuits. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956

Re: [time-nuts] AD9913 programmable modulus DDS. was: Re: An (unknown?) nasty feature of the DDS principle for time nuts applications

lookup-table is always modules-2, isn't 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 adequately be explained by incompetence

Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit

In message 001001cbb7a8$c5456800$4fd03800$@net, Chris Erickson writes: Don't overlook the fact that [...] But hands in the air, who wouldn't love to have one to play with ? Right, me too :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit

In message 4d36a7f1.3080...@rubidium.dyndns.org, Magnus Danielson writes: On 01/19/2011 09:04 AM, Poul-Henning Kamp wrote: In message001001cbb7a8$c5456800$4fd03800$@net, Chris Erickson writes: Also, finally we could build a true atomic wrist-watch without needing to be building constructors

Re: [time-nuts] Completely OT: Removing electrolytics of leaking capacitors from a pcb

). -- 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-nuts mailing list

Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit

days most of them ultimately fail from the high operating temperature, through a variety of mechanisms. For the CSAC, my bet would be that the laser is the limiting factor. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit

In message 4d37419f.2040...@rubidium.dyndns.org, Magnus Danielson writes: On 01/19/2011 06:44 PM, Poul-Henning Kamp wrote: In messagedbb70463b9d04f6589fbf97b2e4be...@vectron.com, Bob Camp writes: I agree, for the CSAC I would expect that the laser would slowly dim, especially as it sits within

Re: [time-nuts] Galileo - CEO of sat builder fired

-cable-011811%2f Talking truth about Galileo never got anybody anything good... -- 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] Symmetricom Launches CSAC Product for Precise Timing and Synchronization

In message 848524.71272...@web38803.mail.mud.yahoo.com, Mark Spencer writes: Don't overlook the start-up time: 2 minutes, that's pretty darn good... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3

Re: [time-nuts] Symmetricom Launches CSAC Product for Precise Timing and Synchronization

In message 4d35ef76.7020...@pacific.net, Brooke Clarke writes: The research that was announced some years ago was Cs atoms: http://physicsworld.com/cws/article/news/20177 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

[time-nuts] PYLT Python LabTools

? = Written by Poul-Henning Kamp, p...@freebsd.org License ? = /* * * THE BEER-WARE LICENSE (Revision 42): * p...@freebsd.org wrote this file. As long as you retain this notice you * can do whatever you want

Re: [time-nuts] PYLT Python LabTools

people and as always, patches are welcome :-) -- 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] PYLT Python LabTools

In message c7d5ad5f-1c94-458e-8f16-19d7c11b3...@rosenberg.net, Kevin Rosenber g writes: On Jan 16, 2011, at 3:00 AM, Poul-Henning Kamp wrote: Probably the next thing I'd add to your system is the ability to select my Prologix ethernet controller, rather than the USB controller. I'll send you

Re: [time-nuts] GC-1000 Clock Cap Choice?

a so-so bargain for power supply bulk capacitance ? -- 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] PYLT Python LabTools

=pylt_site.hp34401a() # do stuff. Problem solved ? -- 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] GC-1000 Clock Cap Choice?

when you read the datasheet either, is it ? Thanks for confirming my suspicion. -- 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] CS reservoir depletion

in 1989 at the Global Issues for an Open World conference here in Copenhagen. 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 explained

Re: [time-nuts] 10811 foam enclosure

as a voltage, and you get a pretty good idea what will happen in pretty much any situation. -- 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] Wide angle light into ST connector/multimode fiber?

are much better if you use a plastic light-guide like those used to extend a SMD LED to the frontpanel on consumer electrics. The exist in both rigid and bendable types. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] New Japanese GPS accuracy

-synchronous polar orbiting D-GPS system. -- 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] New Japanese GPS accuracy

In message 37403.1294167...@critter.freebsd.dk, Poul-Henning Kamp writes: In message aanlktimgaakx-ojheupbmtsfrfh8qlrsvm5sdqxss...@mail.gmail.com, Jose ph Gray writes: No details on how the extra Japanese satellite is making it possible to get this accuracy. http://www.crunchgear.com/2011/01/04

Re: [time-nuts] HP5370B anomaly

got involved however, could be anything at the level I measured it, even microphonics from the fan. 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

[time-nuts] interesting trick from ALMA paper

Alma #511 has an interesting trick for phase comparison: two counters, an adder and a DAC... http://science.nrao.edu/alma/aboutALMA/Technology/ALMA_Memo_Series/alma511/abs511.shtml -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

Re: [time-nuts] LORAN C is good again tonight 90070

of the atlantic: http://maps.google.com/maps?q=eidi,%20foroe%20islands -- 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] LORAN C is good again tonight 90070

to local resistance, that station never happened as planned, instead it ended up somewhere else in England. -- 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] free: Astron 2000C LORAN receiver

-Time-and-Frequency-Receiver.html As far as I can see, it is a 3-digit-GRI model, so it will not be able to receive european chains. -- 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

Re: [time-nuts] Form factor

on the bus. It can be done, but it's messy. MODBUS is also an option. Be aware that most of these types of protocols are strictly command-reponse, there is no provision for 'interrupts' or other asynchronous events. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Form factor

the shared bus, and you're all set. I have yet to see an microcontroller without an async port. Poul-Henning PS: I can highly recommend A. Tanenbaums Computer Networks if you have never worked with this kinds of comms issues before. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] Form factor

In message aanlkti=jwicdwbfwizorpuf3vpj=dzxxveq7cj-ab...@mail.gmail.com, Chri s Albertson writes: Opto-isolater? Why not just use fiber cable between cards. I have only ever seen point-to-point versions, I needed 7 cards connected. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] Loran?

: http://www.sparkfun.com/products/711 In addition you need some source of 42 MHz clock, I used the TAPR PLL board, but anything goes. -- 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

Re: [time-nuts] LORAN C antenna thoughts from the group

little. How might reception be improved in the US? I built a trivial loop based on a design-idea I found at vlf.it http://phk.freebsd.dk/loran-c/Antenna/ It's basically a loop with an AD797 amplifier and some power-filtering, didn't even write a schematic for it... -- Poul-Henning Kamp

Re: [time-nuts] LORAN C antenna thoughts from the group

-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 explained by incompetence. ___ time-nuts

Re: [time-nuts] LORAN C antenna thoughts from the group

found a good way to determine that automatically. -- 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] Loran?

-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-nuts mailing list -- time

Re: [time-nuts] Frequency counter recommendation

to a small USB-enabled microcontroller with an optocoupler to the real stuff. -- 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] Loran DX and Austron 2100

In message 61515.12.6.201.2.1292262311.squir...@popaccts.quikus.com, J. Fors ter writes: Relative to the old Iceland chain, the new 4-digit GRI's should be more immune to noise because 1kHz raster signals average out. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Data Professionals Press Release

a penny on the dollar). Actually, they do evaporate if nobody defends them. -- 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] Data Professionals Press Release

. But a rights holder almost never loses all rights, [...] ...provided they can prove that they own them 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] Timing over low bandwidth channels

better than the second to second jitter on the 1200km propagation. -- 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] temperature stability basics

In message 4cf1d64e.2010...@earthlink.net, jimlux writes: Poul-Henning Kamp wrote: We use aerogel for insulation in Mars rovers.. Those little RHUs don't put out a lot of heat, and you don't have much electronics on at night. Do you know if that is in big blocks or in granular form ? -- Poul

Re: [time-nuts] Help identifying oscillator

the customer was Agilent. Any ideas? Thanks. The frequency sounds like something that could be related to SONET communications... -- 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] temperature stability basics

In message 4cf26fe2.40...@earthlink.net, jimlux writes: Poul-Henning Kamp wrote: There's a fair number of recipes around to make your own aerogel. The CO2 route is pretty safe, but be very carefull with the alcohol route, the swedes blew up a lab with supercritical alcohol once... -- Poul

Re: [time-nuts] temperature stability basics

supercritical evaporation, but you can use any liquid which can dissolve or replace the water seamlessly. CO2 is the preference because the triplepoint is convenient, but until somebody figured that out, alcohol was used. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] temperature stability basics

*, and at the same time the solid with the lowest density. The first thing people do on picking up a piece of aerogel is typically to crush 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

Re: [time-nuts] temperature stability basics

even see that the insulated patch of the wall is colder than the uninsulated patch... Highly recommended way to reduce heat-loss from behind radiators. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3

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