Re: [time-nuts] HP 5065A A1 replacement with DDS

g the divider with a microcontroller, and that seemed to work, but as I mentioned, my end-plans are slightly more ambitious. -- 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 ma

Re: [time-nuts] HP 5065A A1 replacement with DDS

the photo-sensor and close the loop. -- 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 5065A A1 replacement with DDS

it). Higher resolution mitigates the spur problem at least a little bit. -- 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] Question about effect of spurious frequency modulation on Allan Deviation

hat. Depending on the modulation signal, there may be moments where the zero-crossing is "where it should be", for instance if the modulation is sine or triangular, but not if it is a signed square wave. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP

Re: [time-nuts] Question about effect of spurious frequency modulation on Allan Deviation

or, and the modulation frequency. If modulation divides *cleanly* into tau and preferably with a big factor, then you can ignore it. Otherwise things get really messy and quite intractable. Picking your taus as multiple of the modulation is usually the best strategy. -- Poul-Henning Kamp | UNIX

Re: [time-nuts] 1PPS for the beginner

the PRS10 and selecting a correspondingly longer timesconstant in the PRS10 might also work, but I have not tried 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

Re: [time-nuts] 1PPS for the beginner

apply this correction, then you get the theoretical performance of your GPS, (subject to a 1ns/s jitter from the resolution of the data field) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BS

Re: [time-nuts] Russian HF Timing Service ?

rom a set of the public KiwiSDR's around the world. See: https://www.rtl-sdr.com/kiwisdr-tdoa-direction-finding-now-freely-available-for-public-use/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since

Re: [time-nuts] Russian Timing Service ?

ays... -- 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 mail

Re: [time-nuts] News

Congrats Magnus! -- 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] Can eloran Backup GPS?

ion, at around $20-50k a piece, depending on specs. In difference from anything relying on radio signals from people you can maybe trust some of the time, INS/IMU is entirely on-board, which can lower your insurance premiums if you sail certain parts of the world. -- Poul-Henning Kamp | UN

Re: [time-nuts] Loran-C Simulation

ndering if Paul, or anyone else >perhaps, has ported this to a currently available device or whether >there are any other DIY designs available? You can get surprisingly far with a 1MSPS 8 bit DAC and a microcontroller. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Question about noisetypes and ADEV

espect to tau is the same, not that the ADEV is the same. -- 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 incomp

Re: [time-nuts] Helium and MEMS oscillators don;t mix well

is a few days supports this hypothesis. At least that is what >Jack told me. Right, but you need a LOT of Radon before the Helium concentration becomes a problem, and the alphas would literally make things glow in the dark. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Helium and MEMS oscillators don;t mix well

talking deep unventilated mineshaft kind of concentrations... Hydrogen is a lot more plausible in my view. -- 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 c

Re: [time-nuts] Helium and MEMS oscillators don;t mix well

had migrated out. Most likely: Because some piece of MEMS machinery broke of ? -- 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] Helium and MEMS oscillators don;t mix well

, the room oxygen sensor would be alarming (having dropped to 20%) and >people would be running for the doors. That's not my experience, most ${GAS}-level detectors are based on some kind of chemical reactivty (or spectroscopy if they are _really_ expensive) and they tend to just ignore helium and

Re: [time-nuts] Noise of digital frequency circuits (was: Programmable clock for BFO use....noise)

ere was a reason for, but I gave up looking for it. I have not found a way to implement it in the analog domain. -- 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] Noise of digital frequency circuits (was: Programmable clock for BFO use....noise)

In message , Azelio Boriani writes: >How many samples of the Loran input signal in that 1/6th of the period? Not many: At 5MHz sample rate it was 8 samples. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD commit

Re: [time-nuts] UK Loran Off Air

retired by now :-)) ) Last I heard, 6731 was being run by a private conglomerate trying to make a GPS-backup for time/frequency purposes a thing. -- 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] Frequency over fiber (was WWV and legal issues)

yet. -- 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 mail

Re: [time-nuts] TIC Characterization

ity you want to tweak it to 9.999 MHz rather than 10 MHz. Yes, that is a fall-back if your siggen cannot control the phase. Of course if you both set 9.999 MHz *and* sweep the phase, you will be able to separte the effects of the siggen and counter even better. -- Poul-Henning Kamp | UNIX

Re: [time-nuts] TIC Characterization

patience for. Plot results, and wonder why you don't get a straight 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 m

Re: [time-nuts] Ublox F9P multi-band GPS receiver

own …. >Stuff gets better from L1 / L2, but then gets worse when you put hanging >bridges back in …. >Keep in mind that hanging bridges do not *always* average out. It's even worse than that: The better your GPS's oscillator, the less the hanging bridges average out. -- Poul-Henning Ka

Re: [time-nuts] Ublox F9P multi-band GPS receiver

>The one thing which is missing is a external frequency input. You can >get a frequency output in its place, but it does not fully replace the >input. That's where the module vs. chip comes in. Consider talking to sparkfun about how they should do the next version ? -- Poul-Hen

Re: [time-nuts] Ublox F9P multi-band GPS receiver

n the GPS receiver internals, and it is very hard to keep stable, but you _can_ do it. I know, because I did :-) -- 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] Some ES100 WWVB BPSK success

ency or jitter >is systematic and if several of us determine they are consistent, >board-to-board and city-to-city, then we can simply apply hard-coded >corrections in s/w. The really interesting experiment is running two of them next to each other, and see if the IRQ timing varies between

Re: [time-nuts] ES100 BPSK WWVB jitter data

In message , Tim Shoppa writes: >I don't see any sawtooth or other weird stuff going on in the residual. I don't think you would be able to detect a sawtooth, even if it were there, with a pulse-per-minute signal between two bare X-tals ? -- Poul-Henning Kamp | UNIX si

Re: [time-nuts] new WWVB BPSK dev board

In message , "John Moran, Scawby Design" writes: >I think I will get distracted over Christmas sketching out some designs ... Grab som I+Q samples from a kiwisdr somewhere and start playing with signals instead. If you like it, start making hardware. -- Poul

Re: [time-nuts] simple phase finder

this way using the same single circular buffer. If you multiply it by 77.5 kHz sine+cosine, you get DCF77 phase and amplitude. If you multiply it by 198kHz you get... There's some very old plots here: http://phk.freebsd.dk/loran-c/CW/ -- Poul-Henning Kamp | UNIX since Zi

Re: [time-nuts] simple phase finder

experiment I have thought about, but not tried: Wind a big loop, run it directly into a sound card with microphone input. -- 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 mal

Re: [time-nuts] new WWVB BPSK dev board

an-C stations left :-) -- 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 WWVB BPSK dev board

;-) -- 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 maili

Re: [time-nuts] new WWVB BPSK dev board

Fort Collins. :-) Write a WWVB extension to KiwiSDR so you can try it all over the world ? -- 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] simple phase finder

he one on page six here: http://www.home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf It goes from practically DC to around 150-200 MHz in my hand-soldered SMD implementation. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP

Re: [time-nuts] new WWVB BPSK dev board

t (the first) in each second, but more bits are encoded each second after the first one, I belive for some kind of "telecontrol" scheme. See 4th plot from the top for (old) evidence: http://phk.freebsd.dk/loran-c/CW/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@fre

Re: [time-nuts] WWVB data to play with

r % 480" gives an output line every 10 msec The "if n < 12000" is the averaging factor of an exponential average. A proper low-pass filter will give much sharper amplitude. Johns sample-rate appears to be almost 1000PPM fast and drifting, it it is trivial to adjust the "do&qu

Re: [time-nuts] Project GREAT - Galloping Galileo version

the name seems a bit grandiose ? -- 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] Comparing the performance of 17 different GPSDOs

still run with SA optimized PLL time constants ? -- 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 WWVB BPSK dev board

olt VREF and still be perfectly happy. There really isn't anything to it... The only reason I'm not active in VLF any more is that I have to choose between VLF reception or my robotic lawn-mowers, and with 5000m² of lawn, that is not even a close call. -- Poul-Henning Kamp | UNIX s

Re: [time-nuts] new WWVB BPSK dev board

ndard. And BPSK *does* improve the timing, because you can very precisely measure when the change of phase happens, and it since it happens at a carrier zero-crossing you can filter it down to +/- sample. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP

Re: [time-nuts] new WWVB BPSK dev board

odulation of RDF and BBC on 198kHz can be nailed down very precisely that way. But the crucial thing is: You need to digitize the carrier. -- 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] SRS PRS10 RFC

e GPS signal dithers the mediocre 1PPS timestamping, but the serial correction prevents the "hanging bridges" from causing wander. Not all PRS10 firmwares support this btw. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD commit

Re: [time-nuts] simple phase finder

In message , jimlux writes: >On 12/5/18 5:39 AM, Poul-Henning Kamp wrote: >All manner of PLLs don't work as well when the input signal is of >varying amplitude. Maybe it works well enough here. The PLL needs a phase offset input, if you do the circular buffer you can st

Re: [time-nuts] Atomic Clocks: It is important that they keep good time, Part 1

tp://phk.freebsd.dk/hacks/HP5065A/20151225_clock/index.html http://phk.freebsd.dk/hacks/HP5065A/20160112_working_clock/index.html (I still have spare PCBs available) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Misuse of word "decimate" (was Re: Short term 10MHz source)

In message <293ce126-e9ef-40a2-e742-966d638cf...@rubidium.se>, Magnus Danielson writes: I can add that as of this morning, "decimate" is also used for the act of reading only every Nth email in a long thread :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

Re: [time-nuts] 4.19 MHz xtal

In message , Neville Michie writes: >Can any of the quartz crystal gurus explain why this >frequency was chosen? 2 to the 22nd power = 4194304 ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] reply re Harrison's timing method - #13 in Vol 176, Issue 44 digest

a rocket failure left stranded in the parking orbit ... but they still completed their science objectives. -- 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] multimeter

In message , Jim Palfreyman writes: >Could I have some recommendations? I'll caution against the Fluke 287: It takes forever to start and it eats batteries faster than is comfortable. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since

Re: [time-nuts] HP Stories: An architectural view of the HP 5060/5061 and awkward oscillator adjustments.

-- 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 lis

Re: [time-nuts] HP Stories: An architectural view of the HP 5060/5061 and awkward oscillator adjustments.

ntirely different failure mode, caused mainly by high temperatures, either from ambient (Tubes) or self heating due to ripple-current in the ESR. Poul-Henning [1] I have tried to find out how slow one needs to ramp. People with chemical clue tell me that electrochemistry, is a matter of se

Re: [time-nuts] HP Stories: An architectural view of the HP 5060/5061 and awkward oscillator adjustments.

f voltage spikes must be kept under the rated voltage, so overrating would buy some transient durability, but other than that... -- 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] statistical distribution of initial frequency error in tcxos

;CDMA in some form - but it was a thought..) Do they have to transmit continuously, our could you use a dutycycle of, say 10%, to reduce the problem to something more manageable ? Obviously that introduces cycle-slips into the math... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.or

Re: [time-nuts] inexpensive fiber optic distribution

and/or the AGC that sets up the switching level. If we are only inside a lab, look at TOSLINK which can be made to do interesting stuff if you play a bit with it. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] HP Stories: Battery Chargers, and a fading idolization of HP

Hugh, I notice your design, like all other HP designs I have seen from that era, operates with a very high margin for low mains voltage. Do you happen to remember what HP's design criteria were for this ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP

Re: [time-nuts] HP Stories: Battery Chargers, and a fading idolization of HP

opher Shawn McGahey's wrote his phd at Georgia Tech on the subject, and it sorts a lot of facts from fiction. -- 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] Correcting measured PPS values with receiver sawtooth correction values

ese events show up as spikes of almost one clock-period outside the normal band, at the "towers" of the "hanging brides". In other words: Standard deviations and variances is not the right tool, you are looking for outliers at a quite distinct distance (+/-) from the mean.

Re: [time-nuts] Good clean-up oscillators

m your LPRO instead. If you only need one GPIO pin, I doubt the exact clock frequency matters much. (The BeagleBone is interesting too, since the PRU units run autonomously at 200 MHz from their own memory, so the main CPU could do other jobs for you.) -- Poul-Henning Kamp | UNIX sinc

[time-nuts] Rollover: Oncore

DATE AUG 14 2002 MODEL #P273T12T11 HWDR P/N # 2 SERIAL # P04N3Z MANUFACTUR DATE 2K06 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since

Re: [time-nuts] Do GPS augmentation services improve 1pps?

eriments[1] and unless you _also_ use your augmentation while in pos-hold, I dont think it is a good idea to use it get into pos-hold. Poul-Henning [1] see: http://phk.freebsd.dk/raga/sneak/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 Fre

Re: [time-nuts] The forbidden question

even if they do not know it has happened, (ie: longitude navigation, digital telephone networks, GPS. Peeking 20-30 years into the future is an unsolved problem, so I would argue that your question is unanswerable at this time. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.o

Re: [time-nuts] timing properties of "spectrum spreading" clocks

In message <80833925-1229-45a3-18ad-3395793c0...@earthlink.net>, jimlux writes: >Has anyone measured the details of the spread spectrum clocks used to >help meet emission limits (like FCC Part 15)? Most of the ones I've seen just FM modulate with a triangle. -- Poul-

Re: [time-nuts] Rubidium Cells for Sale ?!

ey will sell you 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 adequately be explained by incompetence. _

Re: [time-nuts] Rubidium Cells for Sale ?!

not quite as fantastic at sea-level. -- 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 inc

Re: [time-nuts] PRS-10 with 1 PPS IN goes nuts - 40 million degrees!

In message <1309221062.1589930.1555609586...@mail.yahoo.com>, Taka Kamiya via t ime-nuts writes: If you poll the PRS-10 too fast, the built-in microcontroller can get seriously confused about the serial interface. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freeb

Re: [time-nuts] Aerial coax downlead placement

gh frequency energy through, so lightning tend to jump from bends and loops, to less inductive paths if possible Be careful with EMI/EMC clam-on ferrites, they can explode in lightning strikes. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] Used Hydrogen Maser, and Mercury Stored-Ion Clocks

Best wishes for the "3rd age"! 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 exp

Re: [time-nuts] High accuracy temp controller ckt

duct of absolute temperature and resistance. -- 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] time-nuts Digest, Vol 180, Issue 22

the guy who spent a whole career on quartz resonators over the guy who just walked out of the library :-) -- 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 ca

Re: [time-nuts] High accuracy temp controller ckt

that (think: live animals and human transplant organs) Costs a fortune. -- 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] Galileo service currently degraded

ports it is attempting to acquire satellites and not producing a navigation >solution. But that is (almost certainly) because they have the sats broadcast "unhealthy" status. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 Free

Re: [time-nuts] Galileo service currently degraded

rankly sucks, and was a major >source of issues. The gpsd software has what looks like a moderately competent python library for UBX. -- 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] LT3042, etc. Re: HP E1938A schematics.

power-supply, typically a LDO, and move it physically closer to the load. On high-end kit, it is not uncommon to see a big chip surrounded by a ring of tiny LDO's spaced as little as a centimeter apart along its periphery. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Building a DMTD/phase noise set in the 21st century

erature-sensitivity of all electrolytics is different from pretty much any other type of capacitor, in that it has a component related to chemical reactions. That makes them totally unsuitable for filtering any voltage references. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.o

Re: [time-nuts] OCXO pressure sensitivity before TCXO

t of a batch will be the ones selected >for use - based on their observed stability - Do you know where their trash bin is located, and if it is locked ? :-) I would love to get my hands on a unit from, say, the 10-25 tier of that process. -- Poul-Henning Kamp | UNIX since Zi

Re: [time-nuts] Hobbyist and prototyping boards with U-blox ZED-F9P

I'm using the olimex board. Works fine. -- 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] generalization of three cornered hat

perty of any timescale algorithm is the ability to alert and exclude false-tickers as early as possible, which makes Kalman filters obvious, despite their quirks. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD sin

Re: [time-nuts] 60Khz received on Wide-band WebSDR

ion I am hearing or something else? No, that is the UK Rugby transmitter. For SDR transmitters all over the world, mainly John's KiwiSDR, visit http://sdr.hu -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD s

Re: [time-nuts] Advantages of GNSS ???

igger challenges than the hanging bridge from the GPS... [1] Or, I guess, if you want to feed the PPS to your HP5370 without having to postprocess the TI measurements for the sawtooth. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD co

Re: [time-nuts] Cold Rubidium?

In message <20191103191220.eb7af29b45fdaf77f2fa4...@kinali.ch>, Attila Kinali writes: Not _quite_ a DIY project yet, but certainly easier than a fountain... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD com

Re: [time-nuts] Cold Rubidium over hyped?

of magnitude all the myriad of "small issues" to fix add up real fast, and when you are done with all of it, you will still have frequency drift. -- 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] tracking position & orientation

relaxing hobby than "Watching continental drift in real time" :-) [2] But only one antenna because Scandinavia has no noticeable rotation. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-

[time-nuts] Looking for HP8566A or HP8568A eprom content

I know this is a little bit off-topic, but I am looking for the EPROM content of the HP8566A or HP8568A spectrum analyzers for a computer archaeology project. Direct email reply, please. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956

Re: [time-nuts] tracking position & orientation

:62520 713469.6500 713470.3210 0.6710 0.0081 0.3067 1. POS Z IGS14 19:301:62520 5227269.8000 5227271.1311 1.3311 0.0133 0.8625 0.2978 1. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 F

Re: [time-nuts] Do ordinary clouds adversely affect GPS reception?

actice that means "any ion ..." Rain clouds harbour significant ionization, long before they become thunderstorms. Apart from that, the lower atmosphere is pretty predictable with respect to ionization. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/

Re: [time-nuts] HP5071A with bad tube.... can I get one used?

likely be "tested, certified & packed at the factory in specific emballage approved as part of the exemption." Ie: HP had an exemption to ship to customers, but not the other way. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 Fre

Re: [time-nuts] Cold Rubidium?

In message , Anders Wallin writes: So sort of a "one-way/drop" fountain really ? -- 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] Cold Rubidium?

a cesium standard ? I wonder if you can replenish the Rb supply ? -- 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 inc

Re: [time-nuts] Lowest Power NTP Server

you do not have to do the "sync clock from remote servers" part. -- 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 in

Re: [time-nuts] tracking position & orientation

Sorry, I read it as "NRCAN wil *only* do L1" -- 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 in

Re: [time-nuts] tracking position & orientation

TRF" output. If you need to convert the result to any other coordinate-system or projection, 'proj4' is your software. -- 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] DC distribution crimp quality

people want to learn about connections, soldered, crimped and otherwise some very good articles can be find in the BSTJ around the time when they invented wire-wrap. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] BME280 board.

p/humidity/light/battery voltage part works great. Havn't played with the motion detector, and didn't buy the microphone option. -- 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] DC distribution

In message <36676b65-57b2-4b2d-94d6-326385ce5...@gmail.com>, Bill Dailey writes : I use http://www.westmountainradio.com/rigrunner.php -- 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] DC distribution

In message <9e07d884-3d64-1b3a-f753-233cac347...@earthlink.net>, jimlux writes: >On 10/4/19 1:41 PM, Poul-Henning Kamp wrote: >> >> In message <5d979ac0.80...@rogers.com>, MLewis writes: >> >>> With audio signals, a soldered crimp is

Re: [time-nuts] DC distribution, Moderator comment

In message <38b5000d-c878-4470-943c-089153b15...@alignedsolutions.com>, Mark Spencer writes: >The catalogue also lists retention clips [...] I use those, they work fine. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 95

Re: [time-nuts] DC distribution

hese available in a public document ? -- 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] DC distribution

les instead of oddly shaped plastic -- 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] DC distribution

or you claim. -- 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] Power supply for time source concerns

asure any kind of difference, be it frequency stability or noise spectrum. -- 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 inc

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