).
Will the clock input to the MCU accept something like 10 MHz? If so solder
on a cable ….
At that point whatever the Teeny does is locked to the 10 MHz. If that comes
from one of the $3 eBay OCXO’s, steer that with a DAC output … now you
have a WWVB GPSDO.
Indeed, if the Teensy needs 28 MHz, then the OCXO
the dust settles, all may be well. . .
> Don
>
>
>> On 2018-08-12 12:20, paul swed wrote:
>> Like all of you I have a few wwvb clocks that work pretty well here in
>> Boston.
>> Certainly have written enough wwvb stuff and created various wwvb
>> projects
>>
Hello to the group its time for a wwvb chronverter update. I used the loop
antenna as Alex suggested. I added caps to resonate it sort of. This added
a nice 6DB increase in output power as measured by a reference antenna to a
HP 3586 slvm. I did try a transformer going from 50 ohm to .75 ohm
odulation method
> would not sync but the phase modulation ones always work.
>
> Ray,
> AB7HE
>
> Original Message
> Subject: Re: [time-nuts] WWVB PM Time Questions
> From: paul swed
> Date: Thu, July 30, 2020 10:39 am
> To: Discussion of precise ti
ou read the online reviews of the clock they are about 99% positive.
> A lot of reviews say their clocks based on the AM modulation method
> would not sync but the phase modulation ones always work.
>
> Ray,
> AB7HE
>
> ---- Original Message
> Subject: Re: [time-nu
they are about 99% positive.
A lot of reviews say their clocks based on the AM modulation method
would not sync but the phase modulation ones always work.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB PM Time Questions
From: paul swed
Date: Thu, July 30, 2020 10:39 am
I've reworked my WWVB Simulator so it can now run on a slightly modified,
328-based Arduino (swapped in a 16.36 MHz crystal for the standard 16 MHz.)
The new code is also now using a GPS module to set the time from the
GPS $GPRMC message and my BALDR clock just syncs up nicely. I used
, but nuke 2 Hz low on this or that device.
Bob
> On Aug 27, 2018, at 11:12 AM, Tim Shoppa wrote:
>
> The consumer WWVB wall clocks use a single 60kHz crystal as a front end
> filter (not as an oscillator).
>
> Unloaded Q of a small tuning fork crystal is often 30,000 or so. (You can
John I was looking for a lot of things around BPSK and SDR and more.
Had not hit this repository yet. But it has the piles of functions that
would be useful. I noted it had a I & Q oscillator. So maybe the way this
all works is you grab these functions and line them up. In looking at the
wwvb
it has the piles of functions that
> would be useful. I noted it had a I & Q oscillator. So maybe the way this
> all works is you grab these functions and line them up. In looking at the
> wwvb SDR for AM mentioned here by Chris thats what I had started to
> understand.
> Really
-nuts] WWVB Chronverter update progress
Hi
Well …. 1Hz at 60KHz is …. errr … (off to Google Calc …) …. 16.67 ppm. That’s a
pretty major lock range for a TCXO. It’s likely > 10X what an OCXO will do.
What the bare crystal in a watch will do … who knows.
Bob
> On Aug 26, 2018, a
ob kb8tq
> Sent: Sunday, August 26, 2018 6:34 PM
> To: Discussion of precise time and frequency measurement <
> time-nuts@lists.febo.com>
> Subject: Re: [time-nuts] WWVB Chronverter update progress
>
>
>
> Hi
>
>
>
> Well …. 1Hz at 60KHz is …. errr … (off to Goo
The UnusualElectronics Chronverter with NEO 6 GPS, 9.6 MHz oscillator.
dividers and such are all up and working. Watching GPS time, Spectracoms
and Truetime clocks all tick at the same time while listening to WWV.
exactly as they should. Now I have a alternate for wall clocks should WWVB
I have taken a similar approach to Wayne's.
When WWVB blinks off my plan is to have a single GPS receiver in the house with
a good antenna and to distribute from it a digital signal that will key little
60 kHz units for each clock.
Attached is source code (well commented) for an Adafruit GPS
nutes (which
>is exactly what you do with WWVB) the only time you get past 0.1 ppm is
>the
>same sort of day/night propagation mode shift that drives WWVB nuts ….
>
>Bob
>
>> On Nov 20, 2018, at 5:35 PM, Donald E. Pauly
>wrote:
>>
>> That was the fi
documentation on the wwvb receiver. I will guess this is going to have an
effect in the actual program.
Regards
Paul
WB8TSL
On Sat, Oct 17, 2020 at 12:06 PM John C. Westmoreland, P.E. <
j...@westmorelandengineering.com> wrote:
> Hello Time Nuts,
>
> Maybe this should be added
d the TFT display is a bit less clear. I have all
> of the details but need to go over them carefully. The teensy 4.0 is
> slightly different in the pins used as compared to the various
> documentation on the wwvb receiver. I will guess this is going to have an
> effect in the actual prog
. I just jammed time
into it several days and its been fairly good with power ups and down. Its
impressive. Though not in an ultimate time-nuts way.
GPS just assures it is accurate. But there is a lot of flexibility.
Main goal of this whole project is to replace wwvb if it goes away. If it
does
can adjust its offset. I just jammed time
> into it several days and its been fairly good with power ups and down. Its
> impressive. Though not in an ultimate time-nuts way.
> GPS just assures it is accurate. But there is a lot of flexibility.
> Main goal of this whole project is to r
Hi
I think we have a little bit of confusion here. WWVB is not going to help
anybody navigate.
It’s not going to help track people with ankle bracelets or trucks stopping at
bars. Car thieves
jamming Lojack still happens. Turn iWWVB on or off, this stuff still goes on.
None
5 PM, Bob kb8tq wrote:
>>> Hi
>>>
>>> That works fine if you are doing things manual to check a local
>>> standard. If you are trying to
>>> disipline a few thousand cell towers 24 hours a day … not so much. It
>>> also works for
>>>
24 hours a day … not so much. It also
> works for
> checking frequency. What modern systems need is time. That gets you into a
> whole
> world of resolving and identifying individual edges. The WWVB signal really
> was never
> set up for this. Loran-C is an example of a sign
veryone.
>
> -Bob N3XKB
>
>
> On Sun, Sep 9, 2018, 9:39 AM paul swed wrote:
>
> > Hello to the group its time for a wwvb chronverter update. I used the
> loop
> > antenna as Alex suggested. I added caps to resonate it sort of. This
> added
> > a nice 6DB
things manual to check a local standard. If
> you are trying to
> disipline a few thousand cell towers 24 hours a day … not so much. It also
> works for
> checking frequency. What modern systems need is time. That gets you into a
> whole
> world of resolving and identifying indi
That was the first time that I had seen an xy plot of WWV versus a
stable crystal oscillator. It is even worse than I thought. I had to
look up FRK to see that it is a rubidium standard. I talked to Jim
Maxton the chief engineer of WWVB many times around 1995. At the time
I was in Gila Bend 80
ve
outputs (distribution amplifier) to remote sites. Was working fine
when taken out of service when WWVB changed to phase modulation.
With original manual and diagrams. $30.
5. Kinemetrics/TrueTime 60-TF LF Receiver/Frequency Comparator.
* See Note. Phase comparison receiver for 60 kHz, compact
construc
, 1.0, 5.0, or 10.0 MHz. Modified to add 10 MHz, 100 kHz
> and 1 Hz TTL outputs, and to remove 12VDC from 10 MHz sine wave
> outputs (distribution amplifier) to remote sites. Was working fine
> when taken out of service when WWVB changed to phase modulation.
> With original manual
age: 7
> > Date: Mon, 31 Dec 2018 04:04:22 -0800
> > From: "Tom Van Baak"
> > To: "Discussion of precise time and frequency measurement"
> >
> > Subject: Re: [time-nuts] More ES100 WWVB Measurements
> > Message-ID: <96BB388753294278
> Subject: Re: [time-nuts] More ES100 WWVB Measurements
> Message-ID: <96BB388753294278A9CDE96C1EA7D9AE@pc52>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi Graham,
>
> That's very nice work. And you have uncovered several unusual eff
e 10 us range off of the code? It’s certainly worth trying. My
guess
is that indeed you can with enough samples.
Once you are looking at carrier phase all is not perfect. Around sunrise and
sunset,
you will have a tough time with WWVB. You also have the basic issue that
propagation
*does* swing yo
Chris Howard wrote:
>
> I received a good pointer about doing the BPSK implementation
> but have just not gotten it done.
>
> Chris Howard
>
>
>
> On 10/12/20 11:02 AM, jimlux wrote:
> > On 10/12/20 7:40 AM, paul swed wrote:
> >> John really appreciate the
gotten it done.
> >
> > Chris Howard
> >
> >
> >
> > On 10/12/20 11:02 AM, jimlux wrote:
> > > On 10/12/20 7:40 AM, paul swed wrote:
> > >> John really appreciate the pointer. Though it doesn't help wwvb BPSK
> > >&
and for me at
least the next thing to take a run at.
Regards
Paul
WB8TSL
Hi Paul:
I have looked at the Teensy 4.0 for use as a WWVB SDR receiver.
The problems I have are:
1.) PJRC (the designer/manufacturer) has gone out of their way to block
access to the standard ARM SWD programming interface
and run the output through a 60 kHz crystal filter. I have to
order the crystals since I don't have any on hand. It will take a couple
of weeks to get the front end working.
I am in Phoenix so the WWVB signal is of decent quality here even during
the daytime. My 25 year old cheap Casio watch will sync
eed to build up the
> RF amp and run the output through a 60 kHz crystal filter. I have to
> order the crystals since I don't have any on hand. It will take a couple
> of weeks to get the front end working.
>
> I am in Phoenix so the WWVB signal is of decent quality here even durin
Hi
> On Dec 27, 2020, at 10:30 AM, Tim Shoppa wrote:
>
> Presumably any "rebroadcast" of WWVB is done in the spirit of near-field
> communications where any far-field radiation falls off like 1/r^3 from a
> small inductive transmitter loop.
>
> A loop the
Presumably any "rebroadcast" of WWVB is done in the spirit of near-field
communications where any far-field radiation falls off like 1/r^3 from a
small inductive transmitter loop.
A loop the size of your entire house would be "small" in terms of 60kHz
wavelength.
Unintended c
i
>>>> …..errr…..
>>>> Can you pull the clock oscillator off the Teensy board? (Yes, the soldering
>>>> iron would be involved).
>>>> Will the clock input to the MCU accept something like 10 MHz? If so solder
>>>> on a cable ….
>>>&
pull the clock oscillator off the Teensy board? (Yes, the
>> soldering
>>> iron would be involved).
>>>
>>> Will the clock input to the MCU accept something like 10 MHz? If so
>> solder
>>> on a cable ….
>>>
>>> At that point whate
Jeffry,
Yes, the sync once per day is due to the Arduino software. The ES100
needs to be told when to start receiving the WWVB signal and when to go
to sleep. You can modify the software to change the time and number of
syncs per day. I would suggest you change it to 2am CA time. The daily
sync
pinout:
>>
>> http://www.isotemp.com/wp-content/uploads/2011/06/Legacy59-21.pdf
>>
>> On Thu, Aug 19, 2021 at 3:56 PM Robert DiRosario wrote:
>>
>>> I got a Trak Systems "Time Code Translator" from ebay. It's a 1U box
>>> with l
A cheap WWVB watch will do the trick.
Andy Backus
From: time-nuts on behalf of Brooke Clarke
Sent: Friday, June 22, 2018 9:58 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Setting Time on WSPR Radio Transmitter
Hi:
I'm
e-nuts] Loss of NIST transmitters at Colorado and Hawaii
Group,
This subject needs some additional detail. I found an article with comments at
https://swling.com/blog/2018/08/nist-fy2019-budget-includes-request-to-shutdown-wwv-and-wwvh/
It is not clear whether WWVB will still be available f
er. But not so good for wristwatches, where the expectation is to
run at uW power levels. I for one would be very irritated at having to take my
watch off my wrist and put it on a charging stand every night. So if this
shutdown comes to pass, I'll be looking for an inexpensive GPS-to-WWVB
converte
018 at 5:31 PM, Bob kb8tq wrote:
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> You can do the 14 db deep modulation with a tristate gate and a pair
>>>> of
>>>>>> resistors.
>>>>>> Ground th
t;> > WB8TSL
>>> >
>>> > On Sat, Aug 25, 2018 at 5:31 PM, Bob kb8tq wrote:
>>> >
>>> >> Hi
>>> >>
>>> >> You can do the 14 db deep modulation with a tristate gate and a pair
>>> of
>>> >> resisto
cy filter on the output of the
> WWVB gizmo may be an issue. Temperature impacts the value of the
> components and that value change impacts the phase of the signal….
>
> Bob
>
> > On Aug 28, 2018, at 9:33 PM, paul swed wrote:
> >
> > LPF filter added 2.2mH
Mark I looked at the 7 and the pulse out wasn't obvious. Indeed at that
cost it would be great if it did produce 60 KHz as it would eliminate the
whole counter chain + power. The chronverter wants GPS data so its a nice
answer.
I have some 6s here so will start with that. Love low power and crazy
Hi,
On 08/31/2018 12:18 AM, Poul-Henning Kamp wrote:
>
> In message <96e995c4-5ca2-af02-9738-0a6d87a9f...@pacific.net>, Brooke Clarke
> writes:
>
>> But it's extremely hard to make a jammer for WWVB (60 kHz) [...]
>
> You can do it city-scale with a
On Sat, Sep 1, 2018 at 9:13 AM, David G. McGaw
wrote:
> I consider saving WWV/WWVH/WWVB to be ON topic. They may not be as
> precise as some on this list like to achieve, but they are publicly
> available methods of time dissemination. I am very concerned that factions
> of N
I was able to sort out my issue with the DST bits with the help of the
code Andy Backus recently published. I believe my code should now be ready
for anyone who's curious to try out. Complete details are available on the
following page:
ignals out there already, but it's unlikely
we in the UK will be bothered by you in the US doing local domestic time
signal tricks.
73.
Dave B. (G8KBV)
On 06/09/18 00:12, time-nuts-requ...@lists.febo.com wrote:
> Subject: Re: [time-nuts] WWVB Translation/Simulation from GPS Data
Hi
Even when dividing from 48 MHz straight to 60 KHz, the uBlox is going to do
a pulse drop / pulse add to keep things on frequency. For a wall clock that
probably
is not an issue. For a phase locking receiver it’s not quite as clear. The 60
KHz
edge is going to hop by about 21 ns every so
Mark
OK I did indeed find what you suggested pretty neat most likely will order
one and see whats what.
That certainly simplifies old 60 KHz and in fact may be traceable. Pretty
amazing.
On Wed, Aug 29, 2018 at 11:39 AM, paul swed wrote:
> Mark I looked at the 7 and the pulse out wasn't
Hi All. Over the years, I have experimented with WWVB and GPS and Rubidium
timing to establish a 10MHz Standard for LO sync in communications receivers.
My career has kept me away from the hobby for some time and, frankly, I am not
very well versed in some of the timing techniques that I read
I feel guilty now:-)
Obviously MSF is strong up here but I was able to receive it from Rugby when I
first moved north using a directional LF antenna and was under the impression
coverage was still ok throughout the UK, although it seems I was wrong on that.
The French station is TDF transmitted
In message <4a8ff8d6-70b2-782e-cb79-21c7e9a49...@earthlink.net>, jimlux writes:
>If I were decoding WWVB to start, I'd break my samples up into 0.1
>second or 0.5 second chunks and process them to see what the carrier
>phase is.
With stable signals like this, it is a b
Hi,
On 12/5/18 3:47 PM, Attila Kinali wrote:
> On Wed, 5 Dec 2018 06:29:01 -0800
> "Richard (Rick) Karlquist" wrote:
>
>> Interesting: isn't 162 kHz within the European
>> Long Wave Broadcast Band? Wouldn't there be a
>> problem with QRM from these megawatt stations?
>> Excuse the naive
On 12/4/18 8:59 AM, Adrian Godwin wrote:
I understand why a low-volume shipment of what started as a board costing a
few pennies costs $50, but does that simply mean that low-cost parts aren't
the right answer for this sort of application ?
How would an SDR based on a raspberry pi zero, a
Hi,
The Allouis phase modulation is as follows :
- sawtooth phase shift of the 162kHz carrier with 40rad/sec slope => +/- 1 rad
shift => +/- 6,36Hz carrier frequency shift
- sequence of full sawtooth periods of length 100msec => frequency 10Hz
- one full period sawtooth codes a « 0 » bit
- two
On Wed, Dec 05, 2018 at 08:23:59PM +, Poul-Henning Kamp wrote:
>
> In message ,
> Club-Intern
> et Clemgill writes:
>
> >- One bit only is coded per second in each minute => 59 bits available
> >because...
> >- 59th second is silent (no phase modulation)
>
> I belive this is
On 12/4/18 1:48 PM, Attila Kinali wrote:
On Tue, 4 Dec 2018 13:12:48 -0800
jimlux wrote:
I maintain that it's the lack of a cheap RF front end that is the sticky
point.
Doing a 2-3 stage transistor based amplifier should give the signal
enough gain to be sampled with the ADC of a uC. I have
On 04/12/18 23:08, jimlux wrote:
On 12/4/18 2:52 PM, Poul-Henning Kamp wrote:
In message <20181204224816.bfef2926d942b52db8061...@kinali.ch>, Attila
Kinali writes:
On Tue, 4 Dec 2018 13:12:48 -0800
jimlux wrote:
I maintain that it's the lack of a cheap RF front end that is the
need a stand-alone, easily portable unit with display; the unit may be
> used
> where GPS, cell phone, or WWVB are not available. Low power consumption is
> highly desirable.
>
> I have seen advertisements of marine quartz chronometers listing an
> accuracy as
> good as <0.01 s
On 4/7/19 10:37 PM, Peter Monta wrote:
Does NIST publish the transmitter bandwidth? I've never seen it, but I
haven't done a serious search.
Maybe somebody near enough to get a clean signal could measure it. What
does a spectrogram look like?
Some of the KiwiSDR receivers are close enough
ailable
>
> I've got a Hewlett Packard 10509A that is a part of the HP 117A VLF
> Comparator. I've not used this antenna since March 2013 when WWVB changed
> the modulation scheme and need to move it along or to the curb if no one
> needs it.
> Send me a note to wa3...@aol.com or w
the same for WWVB.
Fortunately thats quite easy to do. Wonder if the pre-amps still good?
Regards
Paul
WB8TSL
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a
t;> January 4, in Batavia, IL. Bob was a member of this list, and many of you
>> may remember him from articles and projects published in 73 Magazine (and
>> others) such as 1994's "Using the World's Most Accurate Frequency Standard"
>> which in great detail he walked through
ou
needed to keep them powered at all times. Afterwords, I was approached by a
woman Sgt. who told me that when she was sent out to a silo to make an
adjustment, that from the sound of it included an hour or so comparison to a
WWVB receiver, she instead just threw the '5245 in the truck and used it
Hello Time Nuts,
Maybe this should be added to this thread - this page is actually pretty
good:
https://en.wikipedia.org/wiki/WWVB
73's,
John
AJ6BC
On Tue, Oct 13, 2020 at 12:50 PM John C. Westmoreland, P.E. <
j...@westmorelandengineering.com> wrote:
> Hello Time Nuts,
>
>
Hi Hal
I think your asking for an A/D if this is a receiver.
I can speak to the front end.
In the the US the signal in the east is some 10-60 uv during the day.
To leverage the full scale of the A/D that has to be amplified to the A/Ds
full scale. Say 1-2 V.
Thats easily some 90DBv of gain. So a
Ray I would tend to agree but I actually am unclear on the context.
Did you actually build a d-psk-r?
The output should always remain in a given phase after its in operation. It
can never be in absolute phase unless far more sentence decoding occurs to
inform the system its correct at 0 or
Paul:
The easiest way to convert a single sample into an I-Q representation is to
have a two phase local oscillator.
You multiply the incoming signal against the primary phase output of the
oscillator for the I channel,
and multiply the same sample against the 90 degree offset output for the Q
On 10/24/20 3:53 PM, paul swed wrote:
Antenna and filtering are not a problem for me. I use the 10' X 10' square
loop and about 800' of wire with a cap to resonate at 60 KHz and then a
preamp really to drive 140' of coax. Currently using a modified KD2BD
receiver frontend but using a 350 Hz xtal
That doesn't appear to give you 1/4 the base sampling rate as you suggest
with "... to sample at 4 times the desired rate..."
I do something similar on a 1kHz tone, generating I/Q at 1kHz sampling rate
on a bandwidth up to 500Hz, ie 750 - 1250Hz
Samples at 4kHz are S1, S2, S3, S4
Then I = S1 + S2
paul swed writes:
> Decoding the actual timecode is a serious pain.
Not really if you approach it from the right side.
A lot of people try to decode these timecodes by looking for a perfect
timegram. That works badly in low SN.
First Tune your discriminator to have three output
themselves are encrypted so you wouldn't be able to
derive anything except a frequency reference. The advantage would be
they are substantially more powerful than WWVB. Does much VLF leak out
into space?
Mark
On 05-Aug-20 3:44 PM, jimlux wrote:
> I was researching potential calibration sour
On 23-Jul-20 4:35 AM, Detlef Schuecker via time-nuts wrote:
> Hi,
>
>> principles. The STM32L4 series which I often use has a pretty decent
>> ADC: fast (5 MSPS), with about 11 good bits in differential mode, and
>> "proper" hardware downsampling (called the DFSDM in the manual). If the
> Yes,
Hi
> On Jul 30, 2020, at 5:11 PM, Hal Murray wrote:
>
>
>> I'm sure there are a lot of transistors in their IC to handle all the phase
>> tracking and time decoding.
>
> They aren't doing phase tracking, just decoding time data. All that crap
> about Atomic Time is just advertising BS.
>
>
> I'm sure there are a lot of transistors in their IC to handle all the phase
> tracking and time decoding.
They aren't doing phase tracking, just decoding time data. All that crap
about Atomic Time is just advertising BS.
Moore's Law applies to transistors. It doesn't matter if you use
mentioned the potential
for harmful interference extending beyond one's own property. (Tom
mentioned it today, including the possibility of legal implications.)
This is especially true of people, like some on this list, who
reportedly run a big loop around their house ("so that all their
I kind of wonder if you don't have a flakey display. I did not add the
terminating R and everything has always worked fine on the display. After I
quit using the 3" jumper cables to the audio card and stacked the modules,
the audio worked correctly.
My display is on a set of 6" jumpers and has
n a
> > lot
> > > of
> > > > discussion and development regarding
> > > > the enhancement of the performance of these TFT displays - also -
> > > there's a
> > > > beta version of the arduino libraries -
> > > > Teensyduino 1
On 10/31/20 7:26 PM, Bob kb8tq wrote:
Hi
On Oct 31, 2020, at 9:45 PM, jimlux wrote:
On 10/31/20 4:46 PM, Bob kb8tq wrote:
Hi
Looking at the data sheet for the MCU, they really do want 24 MHz and that’s
about it. I suspect you would
do better to take your 10 MHz OCXO and run it into one
t;
> I have had a old True Time 60-DC that stopped working years ago when
> WWVB added phase modulation sitting on my self. Well I finally got the
> inspiration and the time to resurrect it... well at lease the vacuum
> fluorescent display part of it. Add in one Raspberry PI and NTP, and
off the shelf multizone
> display that accepts NTP or receives WWVB?
>
> Because, after all, if I glance up and want to know what time it is in DC, I
> want it accurate to microseconds.
>
>
> (My wife keeps setting other clocks in the house fast for one reason or
> anothe
ocks and put them there.
>
> But, being a member of this list - anyone know of a off the shelf
> multizone display that accepts NTP or receives WWVB?
>
> Because, after all, if I glance up and want to know what time it is in
> DC, I want it accurate to microseconds.
>
>
> (My
Hi Paul,
> I guess I would ask what the goal of the effort might be.
> It seems like a good answer. One thing I was amazed buy was that back in
> the 1960s HP wrote some papers on using WWVB. What they did was check the
> offset at distance everyday about the same time. This offered
HP journal
On Saturday, January 16, 2021, 12:29:24 PM GMT+1, Gilles Clement
wrote:
Hi Paul,
> I guess I would ask what the goal of the effort might be.
> It seems like a good answer. One thing I was amazed buy was that back in
> the 1960s HP wrote some papers on using W
re". Shelf edge display is interesting. When I was
sitting gazing upon the shelf, I was thinking battery powered clock, and
if it has NTP (or WWVB), all the better, to keep it set.
28" - 71cm across
On Sun, Jan 10, 2021 at 10:08 AM Didier Juges wrote:
Well, the latency in the php web pa
Hi Hal,
I have one of these big (maybe 14" dia) old office clocks, still
working, hanging on the garage wall at the farm, next to a modern WWVB
clock. I don't worry about what time it says, but I sometimes look to
estimate total power outage time (can be quite a lot up there) since the
now, I would probably setup one of the battery powered
clocks that listens to WWVB. When were they first widely available?
I think I used my watch back in the pre-GPS days when I was taking care of the
time servers on Xerox-PARC's network. I'm not sure why I thought my watch was
any good.
t;> John I was looking for a lot of things around BPSK and SDR and more.
> >> Had not hit this repository yet. But it has the piles of functions that
> >> would be useful. I noted it had a I & Q oscillator. So maybe the way
> this
> >> all works is you grab th
t;> Had not hit this repository yet. But it has the piles of functions that
>> would be useful. I noted it had a I & Q oscillator. So maybe the way this
>> all works is you grab these functions and line them up. In looking at the
>> wwvb SDR for AM mentioned here by Chris that
al Message-
>> From: time-nuts On Behalf Of Bob kb8tq
>> Sent: Sunday, August 26, 2018 6:34 PM
>> To: Discussion of precise time and frequency measurement <
>> time-nuts@lists.febo.com>
>> Subject: Re: [time-nuts] WWVB Chronverter update progress
>>
>
y different in the pins used as compared to the various
>> documentation on the wwvb receiver. I will guess this is going to have an
>> effect in the actual program.
>> Regards
>> Paul
>> WB8TSL
>>
>> On Sat, Oct 17, 2020 at 12:06 PM John C. Westmoreland
tantaneous. Operators are always pressed by cost
> constraints. Adding
> anything beyond the minimums … not going to happen.
>
> The result is that there are no systems out there that use WWVB or WWV other
> than wrist watches
> and wall clock like devices. Utilities (cell phones, in
that go in them similarly take years to get onto the
>> market. Once designed
>> deployment is far from instantaneous. Operators are always pressed by cost
>> constraints. Adding
>> anything beyond the minimums … not going to happen.
>>
>> The result is that there ar
beyond the minimums … not going to happen.
The result is that there are no systems out there that use WWVB or WWV other
than wrist watches
and wall clock like devices. Utilities (cell phones, internet, finance ) run
with something else. Converting
them to a secondary “something” is a many years sort
L. Charvat posted: "Precision time is ubiquitous today thanks
to GPS and WWVB. Even your Macbook or smartphone displays time which is
synchronized to the NIST-F1 clock, a cesium fountain atomic clock (aka
the 'Atomic Clock') that is part of a global consortium of atomic cloc"
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