an measure 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 b
when 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
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
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
: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
more 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
ck "ITRF" 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
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
gling, I wouldnt be at all surprised if the next
two generations of that concept delivers almost two orders of
magnitude improved 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
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
em
in 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 b
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 ade
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
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 |
ut the temp/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
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
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
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.
__
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
ion for 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.
___
ounting holes 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.
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
ture-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
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
consistent x2-x3 improvement in Modified
Allan Variance.
--
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
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 incompe
s, 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
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
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
ey on 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
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
t 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
far bigger 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
inal 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...@freebs
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 |
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
on measurements of the
>atmosphere using a directive array of helical antennas facing the limb.
How do you orient a choke ring antenna in space ? Is the distance
for LEO to GNSS orbits long enough that you can still just "point
it upwards" ?
--
Poul-Henning Kamp |
ortant property 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
blic, 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...@free
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.
--
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 they 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.
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
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
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
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
elite which 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
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 s
overy 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
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
--
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
very brief 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
e 'lyt up.
Drying out is an entirely 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 elec
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.
Christopher 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 malic
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 | T
and feed it
from 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 Ka
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
>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 ?
--
Pou
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-
In message , Mark Sims writes:
>When I was playing with the sidereal time code I found lots of
>buggy/bogus implementations
This book is the cure:
https://www.cs.tau.ac.il/~nachum/calendar-book/third-edition/
--
Poul-Henning Kamp | UNIX since Zilog Zeus
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
2_working_clock/index.html
I still have a pile of those PCB's in case any of you want 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 w
http://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
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
have 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 attr
e your
>time-nut hat on, they are crappy clocks with lots of common mode errors
>(temperature, network delays). I think the techniques should apply.
They do. But in my experience all you end up getting is a very precise
measurement of the air-conditions performance.
--
Poul-Henni
e latency 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 be
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
r how many of these 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.
he 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
> if anyone uses a coiled antenna .. best keep it in sight and have a fire
> extinguisher handy.
That's when you transmit, not when you receive.
If having coiled wire were that dangerous, they would not sell it on drums.
--
Poul-Henning Kamp | UNIX since Zilog
ked the 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 | T
quot;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 "
he 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
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
c
here were some Loran-C stations left :-)
>
>I could see the GRI 8000 Chayka constellation thought.
I have never been able to calculate a plausible position from that
here in Denmark, I'd be very interested to see your calculations if
you succeed.
--
Poul-Henning Kamp | UNIX since Zi
t;has one)
There is one 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
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.
___
In message <20181205150943.d18ce043dfd44d2731220...@kinali.ch>, Attila Kinali w
rites:
>On Tue, 04 Dec 2018 22:56:54 +0000
>"Poul-Henning Kamp" wrote:
>
>> And the BPSK does improve timing.
>>
>> If you have access to, and tracks the carrier,
riers
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 | UNI
allows you to capture and save the raw IQ data.
If necessary read:
https://www.dspguide.com/
Now, stop talking and start coding :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since
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
ause you can average for minutes
if you want - provided you feed the ADC a good stable clock.
--
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 e
e-standard.
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 | T
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
sub-volt 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
there.
But for anything more than that, you *have* to get hold of the carrier and not
just the modulation.
--
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
ssing ;-)
--
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
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
rely possible.
See also: Loran-C ?
And with the new phase modulation, you can do get down in low
microseconds at tau=1, but the atmosphere will ruin longer taus.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD
signal you prefer (or an ensemble of 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 i
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
e. Thanks.
>
>How is your pendulum oriented?
>
>If you had good seismic data, could you correct?
And can you reverse-engineer the local ground movement from the
pendulum measurements ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since
f
I thought Resolution B was much more relevant for us: It defines TAI
https://www.bipm.org/utils/en/pdf/CGPM/Convocation-2018.pdf
(page 34 forwards)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD
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
ration
>1%, 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 t
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 can
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
s even smaller than Helium atoms, and present in copious
amounts near any rechargeable battery and a fair number of industrial
processes.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attr
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