Re: [time-nuts] New WWVB modulation format receivers (NOT)

2014-02-22 Thread Poul-Henning Kamp
(averaged) signal on an integral Hz carrier frequency. There are Arm chips out there now with 1MSPS*12bit ADCs that's plenty for this kind of stuff. (see also: http://phk.freebsd.dk/AducLoran/) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956

Re: [time-nuts] 5370 processor boards available

2014-02-24 Thread Poul-Henning Kamp
your HP5370 a kick into the next millenium. The potential for future improvements is also virtually unlimited: How about hooking up an LCD display and calculate and show allan variance in real time ? Thanks a LOT John! -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Different breed of time nuttery

2014-02-24 Thread Poul-Henning Kamp
. Nah... Just run it through a turing machine which counts the seconds/minutes whatever, and you're golden: http://aturingmachine.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

Re: [time-nuts] A small piece on HP's hydrogen maser in 1968

2014-02-24 Thread Poul-Henning Kamp
twist his brain in order to get to that final punch-line :-) -- 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] 5370 processor boards available

2014-02-24 Thread Poul-Henning Kamp
, but don't know the incantations for Linux) -- 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] A small piece on HP's hydrogen maser in 1968

2014-02-24 Thread Poul-Henning Kamp
the hydrogen masers to use brand new lighter weight and much smaller rubidiums. I've found no trace of it. Are you sure you are not confusing it with the pathfinders for NavStar ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

Re: [time-nuts] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
hardware. -- 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] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
. Seriously: Keeping the computer alive and eating power is silly. We just need to find out how to get the Linux configured correctly. (Or port it all to FreeBSD, which I'm considering, because there I know how to do it :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
Linux, so there are logfiles, daemons and all sorts of stuff which writes. It needs to be pared down to a sensible embedded configuration. -- 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] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
of the file system that needs to be written onto a RAM disk... probably should be the /var directory. That's exactly what NanoBSD does, with a few more wrinkles to boot: https://www.freebsd.org/doc/en/articles/nanobsd/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
the point: If all the permanent filesystems are mounted read-only, and only ram-disks are mounted read-write, you don't even need to shut down, you can just yank the power. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
$5. Lets just say that I seem to use fairly, resonable, save, improvement and suitable in a different way than you do. The easiest way to do the kind of stuff you're talking about, is to NFS mount a filesystem on the BBB. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] 5370 processor boards available

2014-02-27 Thread Poul-Henning Kamp
-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] 5370 processor boards available

2014-02-28 Thread Poul-Henning Kamp
of the 200MHz signal. But don't miss the fact that being able to make a LOT more measurements in the same time also improves noise statistically. -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-02-28 Thread Poul-Henning Kamp
experiment. -- 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. attachment

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

2014-02-28 Thread Poul-Henning Kamp
and that the zero-crossing jitter therefore moves into the window where it matters ? -- 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] 5370 processor boards available

2014-03-01 Thread Poul-Henning Kamp
. -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-01 Thread Poul-Henning Kamp
hard to unground. -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-02 Thread Poul-Henning Kamp
of degrees. Looking at some old notes from years past which just didn't make sense, does now. -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-02 Thread Poul-Henning Kamp
research is clearly needed, and I'd really love to see what results other people might get. In the meantime, run you 5370 on internal clock, and rely on the law of big numbers. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-03 Thread Poul-Henning Kamp
and that solve^H^H^H^H^Hhides all the problems. -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-03 Thread Poul-Henning Kamp
, but if it is synchronized to the input signals being 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 explained by incompetence

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-03 Thread Poul-Henning Kamp
in my experiments. The issue is if the HP5370 internal signals are synchronized to the signals you're trying to measure, then you're in trouble. I saw the same kind of phenomena running the HP5370 on its internal OCXO and feeding the HP3336 ref-in from HP5370-ref-out. -- Poul-Henning Kamp

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-03 Thread Poul-Henning Kamp
) fo.write(%4d % ph + %5.3f % (.1 * ph + j * .005) + data + \n) -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-03 Thread Poul-Henning Kamp
, but there is so much to learn, and so little time... -- 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] Why using HP5370 ext-ref is (maybe) a bad idea

2014-03-03 Thread Poul-Henning Kamp
In message 531505bc.4050...@rubidium.dyndns.org, Magnus Danielson writes: On 03/03/14 22:35, Poul-Henning Kamp wrote: In message 5314ef87.1020...@rubidium.dyndns.org, Magnus Danielson writes: Indeed. Let's assume that it's not the BBB causing the issue, but it's inherent to the 5370 design

Re: [time-nuts] Another atomic clock question

2014-03-03 Thread Poul-Henning Kamp
uncertainty of 0.71e-6. -- 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] Any Isotemp OCXO107-10 Info?

2014-03-11 Thread Poul-Henning Kamp
In message 531f7161.2080...@sasktel.net, Ed Palmer writes: I just picked up an Isotemp OCXO107-10 Oscillator. I can't remember which variant the on I have is. I'll check tomorrow. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD

Re: [time-nuts] Any Isotemp OCXO107-10 Info?

2014-03-12 Thread Poul-Henning Kamp
:-) Hope this helps... -- 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] Any Isotemp OCXO107-10 Info?

2014-03-12 Thread Poul-Henning Kamp
. Sounds likely. Good luck, and keep me posted, I'd like to hear how your '107 measure. -- 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] Any Isotemp OCXO107-10 Info?

2014-03-12 Thread Poul-Henning Kamp
. I'm not running this OCXO very often, but when I power it up I don't bother with EFC until it has settled for a couple of days, it's a very slow riser. -- 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] Any Isotemp OCXO107-10 Info?

2014-03-12 Thread Poul-Henning Kamp
. -- 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] Any Isotemp OCXO107-10 Info?

2014-03-14 Thread Poul-Henning Kamp
Since I had it out, I decided to let it run and this morning I measured the EFC characteristic. In my case perfect frequency is at 4.025V and the sensitivity is 0.2317 PPM/Volt so the design EFC range is probably +/- 1PPM -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Aircraft ping timing

2014-03-20 Thread Poul-Henning Kamp
In message 279331507.5734621395275538874.JavaMail.actor@webmail5, iovane@inw ind.it writes: My question was on what would be the expected accuracy of the circle's radius. Projected onto the surface of the earth, the uncertainty leaves a band approx 740km wide. -- Poul-Henning Kamp | UNIX

Re: [time-nuts] Aircraft ping timing

2014-03-20 Thread Poul-Henning Kamp
is silent it is too late. -- 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] Aircraft ping timing

2014-03-20 Thread Poul-Henning Kamp
In message 532ae780.4020...@earthlink.net, Jim Lux writes: On 3/20/14 12:07 AM, Poul-Henning Kamp wrote: Is there a document that describes the system somewhere? I've seen various descriptions of what's going on. Do they use timing or amplitude measurements? It is a timing measurement

Re: [time-nuts] Aircraft ping timing

2014-03-20 Thread Poul-Henning Kamp
in real-time, but now that it's on file in lower resolution, that's too late. -- 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] Aircraft ping timing

2014-03-22 Thread Poul-Henning Kamp
Unions and national security has a lot to do with that. Can you imagine how much an aircraft like that is worth in spare parts alone? It is worth more as scrap metal. There is no market for untraced spare parts for large passenger jets. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] Aircraft ping timing

2014-03-22 Thread Poul-Henning Kamp
In message 532e01ee.3040...@pacific.net, Brooke Clarke writes: There are two scenarios regarding MH370: [...] Three: 3) Somebody stole the plane for some reason. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] NIST time services

2014-03-22 Thread Poul-Henning Kamp
The main problem for NIST or USNO's servers is not the actual time transfer into the machine -- that is a solved problem, but rather getting enough packets spit out precisely enough, with the required signature to make it traceable. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] NIST time services

2014-03-22 Thread Poul-Henning Kamp
In message 532e1620.9080...@tuffmail.us, Mike George writes: The PRU on the BeagleBone each include an enhanced capture module that can be used as you describe. I belive there is also some magic in the ethernet controller, but I have yet to study it carefully. -- Poul-Henning Kamp

Re: [time-nuts] Aircraft ping timing

2014-03-23 Thread Poul-Henning Kamp
of old military scrap through the radiation detection portal at a scrap-yard :-) -- 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] NIST time services

2014-03-24 Thread Poul-Henning Kamp
In message CABbxVHuQc0144==21mDa_R8ErKov=em+9rvrbpggexnzztj...@mail.gmail.com , Chris Albertson writes: Yes. NTP calls it root distance [...] And it is generally useless, because people don't calibrate it. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP

Re: [time-nuts] NIST time services

2014-03-24 Thread Poul-Henning Kamp
In message e1wsboi-000dny...@stenn.ntp.org, Harlan Stenn writes: Poul-Henning Kamp writes: In message CABbxVHuQc0144==21mDa_R8ErKov=em+9rvrbpggexnzztj...@mail.gmail.co m , Chris Albertson writes: Yes. NTP calls it root distance [...] And it is generally useless, because people don't

Re: [time-nuts] NIST time services

2014-03-25 Thread Poul-Henning Kamp
more or less as is should. -- 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] Hanging bridge question

2014-03-25 Thread Poul-Henning Kamp
for sawtooth there's nothing additional to do about hanging bridges. The sawtooth correction *is* the correction for the hanging bridge. -- 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] Hanging bridge question

2014-03-25 Thread Poul-Henning Kamp
and educational project :-) -- 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] NIST time services

2014-03-25 Thread Poul-Henning Kamp
In message CAKyJ6kajBO=yvkg44s_sdo5owruzem4tzx8atvcirkmgcn8...@mail.gmail.com , Paul writes: On Mon, Mar 24, 2014 at 4:26 AM, Poul-Henning Kamp p...@phk.freebsd.dkwrote: And it is generally useless, because people don't calibrate it. How do you calibrate root distance assuming that it's one

Re: [time-nuts] Hanging bridge question

2014-03-26 Thread Poul-Henning Kamp
is to apply it in software after all the hardware measurements had their errors smoothed out by 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

Re: [time-nuts] GPSDO simulation tool

2014-03-26 Thread Poul-Henning Kamp
. -- 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] A little tail about using the time-nuts tricks at work

2014-03-29 Thread Poul-Henning Kamp
to have time frequency direclty involved: The Allan Variance is an incredible useful way to identify periodic issues, almost no matter what the dataset is about. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD

Re: [time-nuts] GPSDO Crystal Aging

2014-04-10 Thread Poul-Henning Kamp
or weeks. Otherwise: I fully agree. -- 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] Measuring the accurcy of a wrist watch

2014-04-15 Thread Poul-Henning Kamp
, but you have to get pretty close to the chip in the smartphone. -- 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] optically excite a quartz crystal?

2014-04-20 Thread Poul-Henning Kamp
a hard time imagining how you would excite it opticaly ? You can obviously hammer it with a wavelength quartz absorbs, but that turns into heat and I somewhat doubt you can get a heat/cooling cycle to run at 10 MHz, even in perfect quartz ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] optically excite a quartz crystal?

2014-04-21 Thread Poul-Henning Kamp
, Bliley had called it something along the lines of X-Grind and not applied for a patent. The Government forced Bliley to share the etching secret without giving any compensation, and the Blileys were bitter about that for the rest of their lifes. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

Re: [time-nuts] New timing receivers?

2014-04-27 Thread Poul-Henning Kamp
In message CAKyJ6kZqOiByDU_CwkZpPiuvzigGh+mqe4O=dpwzz4wo9gr...@mail.gmail.com , Paul writes: Sawtooth (quantization) correction is probably the defining characteristic. Position Hold is what makes a GPS receiver timing, the sawtooth correction is icing on the cake. -- Poul-Henning Kamp

Re: [time-nuts] SRS FS700 questions

2014-05-04 Thread Poul-Henning Kamp
-standard module with HD44780 interface... -- 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] Weather/units question for European members

2014-05-24 Thread Poul-Henning Kamp
and hectopascal. See for instance: http://www.dmi.dk/vejr/til-lands/regionaludsigten/vssjaelland/ -- 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] Ublox 7

2014-05-24 Thread Poul-Henning Kamp
in the ESO ELT telescope: https://www.eso.org/sci/meetings/2012/RTCWorkshop/4_1-kamp.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] Caveats on Allan Deviation with ultra stable oscillators

2014-05-30 Thread Poul-Henning Kamp
, their environmentals should be attenuated enough for it to not matter. -- 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] Caveats on Allan Deviation with ultra stable oscillators

2014-05-31 Thread Poul-Henning Kamp
. Once you get to turtles it kind of settles down :-) -- 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] Is it Hz or MHz ?

2014-06-02 Thread Poul-Henning Kamp
. -- 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] Boeing 787 GPS reception trouble

2014-06-02 Thread Poul-Henning Kamp
happen. -- 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] Boeing 787 GPS reception trouble

2014-06-02 Thread Poul-Henning Kamp
-television. Apparently this disturbed something in the cockpit, but there is no evidence to indicate that it was actually a problem in the cockpit, only that they spotted some kind of noise. And that's when and why the FAA introduced the ban. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] Audio DAC for GPSDO?

2014-06-02 Thread Poul-Henning Kamp
or is there some practical reason to go with a traditional DAC? A lot of them have DC protections, so you can't leave them at a particular input value for very long before they go into safety mode and clamp the output to zero. Your speakers love them for this, your OCXO not so much. -- Poul-Henning Kamp

Re: [time-nuts] Sad news Ulrich Bangert

2014-06-20 Thread Poul-Henning Kamp
In message 53a49f22.5060...@paesler.de, Hartmut Paesler writes: unfortunately I have to deliver the sad news that Ulrich Bangert, DF6JB passed away on 11/06, aged 59. He made the world a better place. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP

Re: [time-nuts] Loran, GPS, Lightning, Timing

2014-06-24 Thread Poul-Henning Kamp
electrical grid industry runs a joint research center somewhere in northern Florida, using this method to test lightning protection of the power grid components. I suspect they ignite their rockets using remote control. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP

Re: [time-nuts] Loran, GPS, Lightning, Timing

2014-06-25 Thread Poul-Henning Kamp
magazine or possibly Elector about 10-20 years back is a good guess. -- 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 8568B

2014-06-28 Thread Poul-Henning Kamp
on the 20MHz base frequency Comb Generators output. -- 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] Xtendwave Everset chips update

2014-07-02 Thread Poul-Henning Kamp
and sells the propriety chips to decode it. The eval board is EUR95 and I bet. See for instance: http://www.fact4ward.com/blog/meteotime/ -- 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] Xtendwave Everset chips update

2014-07-02 Thread Poul-Henning Kamp
In message 23298.1404324...@critter.freebsd.dk, Poul-Henning Kamp writes: In message cad2jfahocx5nyhmzjgrgwb4oljawumvwm7fvocym_y6agaa...@mail.gmail.com, paul swed writes: Though if the clocks are in the $20 range thats a different discussion. Somehow I suspect its the $1000 range. No honest

Re: [time-nuts] Antenna

2014-07-08 Thread Poul-Henning Kamp
a frame and make a number of turns of wire, and put a low-noise amplifier up in the attic. What existing projects should I look at or take inspiration from? http://phk.freebsd.dk/loran-c/Antenna/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] Antenna

2014-07-08 Thread Poul-Henning Kamp
In message 53bc56fc.3030...@rubidium.dyndns.org, Magnus Danielson writes: Hej Poul-Henning, On 07/08/2014 09:59 PM, Poul-Henning Kamp wrote: In message 53bc4b9f.6040...@rubidium.dyndns.org, Magnus Danielson writes: I have a FS700 sitting here, but no antenna. There should be other signals

Re: [time-nuts] HP3458A calibration memory backup

2014-08-11 Thread Poul-Henning Kamp
. Perhaps the memory chip is not enabled at those addresses and it is reading a floating bus? Hm, that's interesting, I havn't seen that myself, but somebody else reported something similar some days ago... -- Poul-Henning Kamp | UNIX since Zilog Zeus

Re: [time-nuts] Fwd: Re: Fwd: MH370 Doppler

2014-08-18 Thread Poul-Henning Kamp
, reconfigure the plane and autopilot and leave by parachute via the back door. The quick detour into the extreme high corner of the planes envelope which seems perfectly designed to incapacitate the passengers makes me lean towards the latter. -- Poul-Henning Kamp | UNIX since Zilog Zeus

Re: [time-nuts] MH370 Doppler (Magnus Danielson)

2014-08-23 Thread Poul-Henning Kamp
flightplan, MH370 could fly unchallenged by all airforces all the way to the Black Sea along the norther route. -- 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] OCXO Phase Noise Measurement in Primitive Conditions

2014-08-27 Thread Poul-Henning Kamp
, getting the timeconstant wrong by a factor of two hardly changes the resultant performance. -- 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] OCXO Phase Noise Measurement in Primitive Conditions

2014-08-27 Thread Poul-Henning Kamp
I suspect that a big part of the reason why the curve is flat is due to the noise-spectrum of GPS. I also think that's why there is no mathematical foundation for this concept: It may be GPS specific. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] OCXO Phase Noise Measurement in Primitive Conditions

2014-08-28 Thread Poul-Henning Kamp
). This is where the GPS long-term stability takes over from the OCXO's better short-term stability. -- 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] NAA experiments as a reference

2014-09-13 Thread Poul-Henning Kamp
The underlying NAA reference is UTC(USNO). How close they track it I don't know. -- 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] Any simple way to get 200 MHz from 10 MHz?

2014-09-28 Thread Poul-Henning Kamp
using it for an experiment to see if your idea even works... -- 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] KO4BB.com

2014-09-28 Thread Poul-Henning Kamp
In message camqqfuk5ofwde82r307neqoovif4miwmea7jt0rvg9htomv...@mail.gmail.com , Didier Juges writes: Thank you for your patience and your support. Didier, Thank you for providing this fantastic resource! -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] fast switching quiet synthesizer

2014-10-07 Thread Poul-Henning Kamp
. -- 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

Re: [time-nuts] fast switching quiet synthesizer

2014-10-07 Thread Poul-Henning Kamp
with a good $20 RS232 cable. -- 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] 5370 processor boards available

2014-10-08 Thread Poul-Henning Kamp
in the right hand side panel. -- 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] Inmarsat needs a time-nut

2014-10-17 Thread Poul-Henning Kamp
that the frequency offset at ground level can be used at lower air-pressure at flight-level in the first place.) I havn't gone through their math to see what the implications would be, but I think it will vastly ruin the geometry of the fix. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog

Re: [time-nuts] LTE-Lite module

2014-10-19 Thread Poul-Henning Kamp
. It certainly can and it's not even hard: Configure the LTE to emit a suitable frequency relative to the OCXO and use an analog PLL to steer the OCXO's EFC. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since

Re: [time-nuts] LTE-Lite module

2014-10-19 Thread Poul-Henning Kamp
detector output, read it with ADC pin, do loop in software, drive efc with DAC. -- 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 module

2014-10-20 Thread Poul-Henning Kamp
average will do just fine. PLLs are really not that hard, and as it happens I wrote this a couple of days ago about it: http://phk.freebsd.dk/time/20141018.html -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] LTE-Lite module

2014-10-20 Thread Poul-Henning Kamp
-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

Re: [time-nuts] LTE-Lite module

2014-10-20 Thread Poul-Henning Kamp
command line interface... Count me 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 can adequately be explained by incompetence

Re: [time-nuts] LTE-Lite module

2014-10-21 Thread Poul-Henning Kamp
calibrated amount of time has passed. -- 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] LTE-Lite module

2014-10-21 Thread Poul-Henning Kamp
not respond to the output, any PI(D) loop will go bezerk, and there's nothing you can do about 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

Re: [time-nuts] Phase, One edge or two? (was Digital mixing with a D Flip Flop)

2014-10-22 Thread Poul-Henning Kamp
you can ever learn. -- 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] Phase, One edge or two? (was Digital mixing with a D Flip Flop)

2014-10-23 Thread Poul-Henning Kamp
signal to the loop (ie: 2Hz from a 1PPS instead of a 1Hz), at the cost of adding a whole lot of noise in the process. Don't do 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] Changing ADEV, (was Phase, One edge or two?)

2014-10-25 Thread Poul-Henning Kamp
measurement white noise, which is why tuning your 5370 for peak performance is worth days of measurements at the other end of the ADEV. -- 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] float chargers for oscillator backup power

2014-10-26 Thread Poul-Henning Kamp
to common-mode filter the supply to the OCXO to get rid of any noise from the DC/DC converter. Yes, it is alot more complex, but the result is also much better. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD

Re: [time-nuts] float chargers for oscillator backup power

2014-10-27 Thread Poul-Henning Kamp
battery (if you have more than one) gets optimal float-charge regulation. -- 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 5370, 5371, 5372, 5373

2014-10-27 Thread Poul-Henning Kamp
they didn't build in a full ADEV(tau) plot function in them (at least the 5372A doesn't have it). I guess one could spend a winter adding the code and burn a new set of eproms, but I've never missed it that much. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Mercury Ion Clock

2014-11-01 Thread Poul-Henning Kamp
invariably get a very complex mag field which owuld be much harder to cancel out. -- 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

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