:27 PM, Bob kb8tq wrote:
Hi
WWVB as transmitted ( = right at the input to the antenna) is a wonderfully
stable signal. As soon as
that signal hits the real world things start to degrade. Propagation between
transmit and receive sites
is a big deal, even at 60 KHz. On top of that, there is a *lot
wwvb. But at least direct
alternatives exist. I am fortunate to be able to actually measure radiated
levels very accurately so will respect the allowed emission levels.
Regards
Paul
WB8TSL
On Mon, Sep 10, 2018 at 4:14 PM, Achim Gratz wrote:
> paul swed writes:
> > Indeed anything coul
controlled
> CMOS gate oscillator to generate the RF.
>
>
> Andy Backus
>
> WA2TND
>
>
>
> From: time-nuts on behalf of paul swed
>
> Sent: Saturday, October 27, 2018 4:01 PM
> To: Time-nuts
> Subject: Re: [time-nuts] WW
Hi
Having looked at WWV with a Carrier -> BFO -> audio card approach (and a radio
locked to an Rb standard …) you have dig a bit to find a situation that is
beyond a tenth of a ppm. If you average over minutes or tens of minutes (which
is exactly what you do with WWVB) the only time y
to remain a sub time-nuts piece of hardware.
Chris
-Original Message-
From: time-nuts On Behalf Of Tom Van Baak
Sent: Thursday, August 20, 2020 22:59
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] WWVB SDR discussion
Mike,
I've used that seller a lot; no worries. They have 800
dB of
gain assuming a WWVB signal of 100 uV. I used 620 ohm resistors to drive
the MC34151 pins 10 and 15 which should be plenty of drive.
If I do a 5 second capture of the output from pin 1, I see the phase
reversals. The reversals are not always on the zero crossing point of
the wave
-Original Message-
From: time-nuts On Behalf Of Tom Van Baak
Sent: Thursday, August 20, 2020 11:59 PM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] WWVB SDR discussion
Mike,
I've used that seller a lot; no worries. They have 800+ items for sale, mostly
clock and weather products by La
in
> die form - could explain the epoxy ball on the PCBA.
>
> The MAS boards are here also:
>
> https://www.amazon.com/CANADUINO-Atomic-Clock-Receiver-60kHz/dp/B01KH3VEGS
>
> https://www.universal-solder.ca/product/canaduino-60khz-atomic-clock-receiver-module-wwvb-msf-jjy60/
>
. Its given me a heck of a time. Just trying
to get the bootloader going and then the simple blink program. I have not
worked on it in a bit as other things have cropped up.
Regards
Paul.
On Tue, Jul 21, 2020 at 8:47 PM wrote:
> I want to decode the WWVB time information using the BPSK informat
was as I recall 30% up the envelope.
Humor on the d-psk-r. The new unit does not have an output that contains
the phase shifts of wwvb. The units intention is to remove all phase shifts
so that all old style phase tracking receivers and clocks work. They all
do. Have 7 of them.
So to experiment
s as I recall 30% up the envelope.
>
> Humor on the d-psk-r. The new unit does not have an output that contains
> the phase shifts of wwvb. The units intention is to remove all phase shifts
> so that all old style phase tracking receivers and clocks work. They all
> do. Have 7 of them.
>
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
actually observe this order of magnitude when a 32kHz crystal used in an
oscillator - remove power and the crystal
very good progress. You can actually feed the loop coild that exists
> with the cap it should resonate.
> Thats my plan at least.
> Regards
> Paul
> WB8TSL
>
> On Thu, Aug 30, 2018 at 9:44 PM, Wayne Holder
> wrote:
>
> > I've had some luck improving things with m
Wayne very good progress. You can actually feed the loop coild that exists
with the cap it should resonate.
Thats my plan at least.
Regards
Paul
WB8TSL
On Thu, Aug 30, 2018 at 9:44 PM, Wayne Holder
wrote:
> I've had some luck improving things with my ATTiny85-based WWVB Simulator
>
through a floor and
marbel kitchen counter top. The antenna touches some metal pipes at points.
But the WWVB clocks lock up very quickly. As a guess the system may be at
the 30 uv level.
May try switching to a coax feed. Not as close to the antenna but see what
it does.
wwvb version 2.0 works. Last step
ve figured out are coded in.
>> One thing we did not do was automatic change from summer to winter offsets.
>> Its really a PIA so just not that excited when this happy switch flipper
>> can do it in 1 second.
>>
>> The other bit of fun for the magical new DPS wwv
> years we have figured out are coded in.
> One thing we did not do was automatic change from summer to winter offsets.
> Its really a PIA so just not that excited when this happy switch flipper
> can do it in 1 second.
>
> The other bit of fun for the magical new DPS wwvb receiver is
years we have figured out are coded in.
One thing we did not do was automatic change from summer to winter offsets.
Its really a PIA so just not that excited when this happy switch flipper
can do it in 1 second.
The other bit of fun for the magical new DPS wwvb receiver is after you get
the bits you
ce project.
Cheers
Detlef Schücker
"time-nuts" schrieb am 22.07.2020
18:44:08:
> Von: "Mark Haun"
> An: time-nuts@lists.febo.com
> Datum: 22.07.2020 19:29
> Betreff: Re: [time-nuts] WWVB PM Time Questions
> Gesendet von: "time-nuts"
>
>
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 signal that was designed
Hi
I most certainly *have* seen an NTP server that ran off of WWVB and relayed
the result to the internet. The fun part was that they had entered the “delay”
number into their config file with the wrong sign on it (or there was a bug in
the NTP code at that time). The result was that they were
With respect, Scott, EVERY ham knows about WWV.
On Saturday, September 1, 2018, Scott McGrath wrote:
> I’m concerned with the science
>
> the WWV/WWVB stations provide invaluable information about the condition
> of the ionosphere with a baseline of DECADES of data.
>
>
. In your case, at 30 ft range, you're so far inside the near field
that all the
antenna articles in the world won't help, since they address radiating into
the far field.
That's what WWVB needs to do, but not you. I think what you want to do is
use a loop
that is no larger than your house, preferably
;> is a far-field
>> concept. In your case, at 30 ft range, you're so far inside the near
>> field
>> that all the
>> antenna articles in the world won't help, since they address radiating
>> into
>> the far field.
>> That's what WWVB needs to d
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 individual edges. The WWVB signal really was
never
set up for this. Loran-C is an example
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 signal that was designed to
identify a specific
edge.
Bob
> On Aug 31, 2018, at 10:30
age <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.
> &
gt; Hi Wayne,
> >> Great to see you found my presentation!
> >> The paper is available here:
> >> https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018_paper.pdf
> >
> > Kevin, thanks for the link to the paper. I'd like to know more about how
> >
ont end -> ADC -> MCU -> D/A would be one approach.
> Various
> > > bits like a local clock also would get into the design. There are
> *many*
> > > other
> > > approaches.
> > >
> > > ==
> > >
> > > Ther
com> wrote:
> For WWVB reception, I use a single turn of 40-conductor ribbon cable,
> configured as a 40-turn loop, brought to resonance with a parallel
> capacitance, that differentially drives an instrumentation amplifier. No
> electrostatic shielding is needed to elimin
ugust 20, 2020 11:00 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] WWVB SDR discussion
Hi Don -
I got two of them on eBay. I got these 274056463528 . They were only $35
each with free shipping, a bargain in my opinion. Of course you can find
smaller diameter
I also have two of these La Crosse Ultratomic BPSK WWVB clocks. Upon
installation of two "C" cells, both clocks synchronized to WWVB within 5
minutes.
I tested this several times with the clocks in various locations well
inside my home; that is significant because after in
on and on.
Regards
Paul
On Wed, Aug 19, 2020 at 6:48 PM wrote:
> Paul,
>
> You message came in just as I clicked Send on my message. If I change
> the MC34151 to a 7474 to synchronize the 60 kHz signal, does that mean
> the phase change always occurs on the zero crossing lik
o.com
Subject: Re: [time-nuts] WWVB SDR discussion
Ray,
I don't see a crystal filter. There is a 16 MHz crystal, but that's for the
processor.
"Inside the La Crosse 1235UA UltrAtomic Radio Controlled WWVB (Atomic) Wall
Clock"
<http://leapsecond.com/pages/ultratomic/>
http:/
rcb...@atcelectronics.com writes:
> Paul,
> "The new de-psk-r I built has no raw wwvb outputs." What do you mean by
> raw?
>
> I have been thinking about how the phase shift could be detected in
> software instead of hardware. Could something like this may
Hi
> On Aug 11, 2020, at 10:27 PM, paul swed wrote:
>
> How do the small AM WWVB clocks work then. They use the 60 KHz crystal and
> they don't actually do anything special. In measuring those clocks they are
> about 2-6 hz wide.
They pop up once a night and grab time from
modulator/flipper it turns the signal into a wwvb bpsk signal. No AM
modulation. But for bench testing its a noise free signal.
But I am interested in the approach you are trying to develop that I guess
might be a SDR solution. Good luck looking forward to your success.
Regards
Paul.
On Thu, Jul 30
tps://unusualelectronics.co.uk/chronvertor2/> the new model supports
a number of protocols including WWvB so it may be an alternative.
Regards,
Per
On 27.12.2020 16:30, Tim Shoppa wrote:
Presumably any "rebroadcast" of WWVB is done in the spirit of near-field
communications whe
Ray, Jeffrey, et al.,
The clock chip supplied with the kit is a DS1307. The DS1307 drift rate
of a minute per month works out to 2 seconds per day. That level of
error is easily observed toward the end of a 24 hour refresh period from
the WWVB chip.
The daily drift of a DS3231SN chip
I have four home-built clocks, each using a Raspberry Pi, all with slightly
different designs, all running gpsd and ntpd (so all are NTP servers on my home
network). Three are GPS disciplined; one is WWVB disciplined. Two of the GPS
clocks use the modem-control lines on a serial port
s, all running gpsd and ntpd (so all are NTP
> servers on my home network). Three are GPS disciplined; one is WWVB
> disciplined. Two of the GPS clocks use the modem-control lines on a serial
> port for the 1PPS signal, one uses the simulated modem-control signals on a
> USB-connect
e'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 module an
This summer, somewhat coincidentally, I got to take a tour of some of the NIST
Time and Frequency Division, rode my motorcycle up to Fort Collins to see the
WWVB antennas, and attended the NIST 43rd Annual Time & Frequency Seminar. I
wrote a couple of blog articles with my n
he public comments should be around someplace.
>
> Larry Sampas
>
> On Fri, Aug 10, 2018 at 5:05 PM, Andy Backus wrote:
>
> > I have a very simple circuit for a (microwatt) 60 kHz transmitter that
> > takes a digital input (only needs someone to calculate out the WWVB cod
it broadcasts
on ham bands, so that isn't a useful argument.
OTOH, the argument that it is OK to obsolete millions of "atomic"
clocks because of NTP is also weak. The present WWVB solution
is "just right" for the problem; the vast majority of users
don't need more
which have immediate effect on lots of people.
What are the effects on the budget of running WWV/WWVB? The electric bill I
would guess. When John Q. Public's "atomic clock" stops working, they'll find a
way to pay the bill.
Wes
On 8/12/2018 11:58 AM, djl wrote:
Just a word: When budge
On 8/12/18 8:40 AM, Craig Kirkpatrick wrote:
I agree with Bob that shutting down WWVB would not go over well with the voters
but losing WWV and WWVH will mainly be noticed only by HAMs.
WWV/WWVH also provides HF propagation forecasts, severe weather warnings
for mariners, etc., as well
tunity=form=
> > 4f5c8b176af03d89abb1a318624c944b=core&_cview=0
> >
> > The public comments should be around someplace.
> >
> > Larry Sampas
> >
> > On Fri, Aug 10, 2018 at 5:05 PM, Andy Backus
> wrote:
> >
> > > I have a very simple circuit for a
Hi
> On Aug 24, 2018, at 1:18 PM, Mark Sims wrote:
>
> Lady Heather has DST support code in it (in file heathmsc.cpp). It supports
> the current standard settings for several areas (US, Europe, Australia, New
> Zealand) or you can specify a custom DST rule. The code is around 200 lines
>
14 db deep modulation with a tristate gate and a pair of
>> >> resistors.
>> >> Ground the input and feed the “modulation” signal to the tristate
>> control.
>> >>
>> >> Bob
>> >>
>> >>> On Aug 25, 2018, at 4:35 PM, paul swed w
rlier threads OOK modulation does not work for high end
> clocks
> >>> like spectracoms and truetimes. Have not tried it on the cheapy clocks
> >> yet.
> >>>
> >>> I added an external modulator. A dg419 analog switch and then with a
> few
> >>&
Like I mentioned before, get a $10-ish Ublox Neo7 board/antenna off of Ebay,
program one of the Ublox pulse output pins for 60 kHz. Add your favorite
microprocessor to talk to the Ublox and drive the modulator. The Ublox 60kHz
output should be more than accurate and stable enough to do
HI
If you are feeding “Time Nuts” gear, a fancy 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.
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 NIST consider that this should no longer be part of their
mission.
David
/products-and-services/time/msf-outages
Question to time-nuts: could you manage with a daytime outage of WWVB for
over two weeks? Haven't heard many UK folk complaining during previous
maintenance periods.
Cheers,
David
--
SatSignal Software - Quality software for you
Web: http
The Ublox 7 has two programmable "timepulse" outputs. The default freqs are (I
think) 1 PPS and 10 MHz.I don't remember if the Ublox 6 has one or two
outputs... also some of the earlier Ublox receivers have limits on the range
you can set the output(s) to (like 1 kHz). Lady Heather can
Tim -- Thanks much for that initial ES100 report. Within a day,
universal-solder.ca sold out their initial inventory of these dev boards so I'm
expecting a flood of technical reports here on the list.
Graham -- Thanks for your comments on I2C. That will surely help others who get
frustrated
In message <1D93794F4BC1422BB065B2EF8C431AFF@pc52>, "Tom Van Baak" writes:
>> So intended for setting the display of a human readable clock face, not
>> "time-nuttery" class performance.
>
>That's likely true, but if someone finds that the latency or jitter
>is systematic and if several
On Tue, 4 Dec 2018 14:44:38 -0800
jimlux wrote:
> 17 passive components and 4 active components. plus the loopstick and
> tuning cap. I think you'd need pretty substantial volumes to get the
> "assembled and delivered" price below $20.
Oh. Sorry, I misunderstood. My design was never intended
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 questions; we don't have longwave
> in the states, so no
In message , Magnus D
anielson writes:
>Looking at it using a Kiwi receiver just north of Stockholm, it comes in
>nice and clean with 100 Hz sidebands from what looks like a PM whose 4th
>sideband is nearly suppressed, so is 8th, 12/13, 21... so slightly more
>that 4th and multiples.
It
Hi,
On 12/5/18 4:27 PM, Poul-Henning Kamp wrote:
>
> In message , Magnus
> D
> anielson writes:
>
>> Looking at it using a Kiwi receiver just north of Stockholm, it comes in
>> nice and clean with 100 Hz sidebands from what looks like a PM whose 4th
>> sideband is nearly suppressed, so
That is the specified jitter. They have also said in communications that it
has about 50mS resolution. That is as close as they are willing to say a
system can be synchronized with it. Perhaps someone will discover a clever way
to enhance that.
BTW, I have been told it has also been
On Tue, Dec 4, 2018 at 9:22 PM Attila Kinali wrote:
> known bits in the BPSK signal are the first 12 bits of each minute.
This seems transparently incorrect to me. If your receiver has access
to only a tiny chunk of signal and no idea of anything else then yes,
but that isn't a realistic
I generated a spiral plot of phase and amplitude covering about 3 minutes of
WWVB last fall. It's a good-size file, around 2MB as I recall.
Should I send it?
Dana
On Wed, Dec 5, 2018 at 8:56 AM jimlux wrote:
> https://www.rtl-sdr.com/tag/vlf/
>
> a fair number of examples -
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 wrong.
The timecode (substantially the same as DCF77) occupies only one
bit (the first) in
I'm a little puzzled as to why people keep calling 60kHz - 'RF'. Many Hi-Fi
audio amplifiers go higher than that.
As for an 'RF' front end, there are dozens of off-the-shelf op-amps that can
amplify the signal from a tuned ferrite rod aerial sufficiently to then feed
into a decent A-D and then
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 sticky
>> point.
Then you have misunderstood how little you actually need.
In message
,
"John Moran, Scawby Design"
writes:
>However, fast A-Ds are not particularly cheap and you would need
>circa 50MHz sample rate to resolve 1deg of the carrier, and TVB has
>already stated that there are no time benefits to BPSK, so this is
>all just an interesting
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 such a design
sitting around, that I
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 sticky point.
Then you have
Hi,
On 12/5/18 5:41 PM, Poul-Henning Kamp wrote:
>
> In message <4cf174e2-47fa-1013-b617-c66fc188f...@rubidium.dyndns.org>, Magnus
> D
> anielson writes:
>
The Loran-C/Chayka plug-in does not calculate position, so already there
would be some fun little mini-project to
Here is more explanation:
I 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
tsho...@gmail.com said:
> As a frequency standard I have no major disagreement with the PTTI article.
> But the 100 microsecond number they give for absolute time transfer seems to
> be based entirely on propagation characteristics and ignores the difficulty
> I've always had in resolving the
: time-nuts@lists.febo.com
Cc: Wa3frp
Subject: [time-nuts] HP 10509A Antenna Available
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
Hi
With all the rain in the spring, you could easily have better local grounding.
Bob
> On Jun 29, 2019, at 10:15 AM, Tim Shoppa wrote:
>
> Interestingly enough, compared to my initial testing last winter, my ES100
> is suddenly much more likely to acquire and track WWVB in br
,
Peter Vince
On Sat, 6 Jul 2019 at 17:06, D. Resor wrote:
> From another list I was directed to this link for those who do not have a
> shortwave radio.
>
> http://websdr.ewi.utwente.nl:8901/
>
> I entered the frequency of 60Khz and am curious to know if this the WWVB
&
t I was directed to this link for those who do not have a
> shortwave radio.
>
> http://websdr.ewi.utwente.nl:8901/
>
> I entered the frequency of 60Khz and am curious to know if this the WWVB
> transmission I am hearing or something else?
>
anuary 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 b
One of the problems with the iMX RT series, is that any processor below the
1064 (Teensy 4.0 and 4.1 use 1062) do not have any internal FLASH. It is
all external in a separate FLASH chip sitting out there waiting to be read
by your competitors. So, the iMXRT has a bunch of boot time complexity,
e) and 0, -1, 0, 1... (quadrature). You could
>> of course use an variable-frequency NCO, but I need a physical
>> oscillator in any case to clock the MCU. I am also thinking in terms of
>> a WWVB-DO where I want a stable local reference to steer. (Although in
>> fair
could
> of course use an variable-frequency NCO, but I need a physical
> oscillator in any case to clock the MCU. I am also thinking in terms of
> a WWVB-DO where I want a stable local reference to steer. (Although in
> fairness, for WWVB I think you probably want stability over the d
r' is a
>>> mere complex value, which is rotated and the power is adjusted:
>> My proposed block diagram does actually have a digital LO, only mine is
>> 1, 0, -1, 0... (in-phase) and 0, -1, 0, 1... (quadrature). You could
>> of course use an variable-frequency NCO, but I
Hi
As long as you sample “fast enough”, you can recover phase. Indeed, even if
you sub-sample (sample to slow), you can still get phase back with a few
relatively minor constraints. Since one of those is “don’t sub sample at exactly
a fraction of the carrier”, a sub-sample “locked” receiver
he arduino libraries -
> Teensyduino 1.54 Beta #4 -
> https://forum.pjrc.com/threads/64303-Teensyduino-1-54-Beta-4 - take a look
> at that
> for those that are experimenting with this platform.
>
> As far as my current setup - in the wee hours today - the WWVB signal was
> co
orum.pjrc.com/threads/64303-Teensyduino-1-54-Beta-4 - take a
> look
> > at that
> > for those that are experimenting with this platform.
> >
> > As far as my current setup - in the wee hours today - the WWVB signal was
> > coming in very strong - my HPSDR rig
>
as been 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 1.54 Beta #4 -
> > > https:
John:
I suggest you try Chris Howard's
https://github.com/chris-elfpen/Teensy4WWVBsdr
You might have to adjust the I/O pins for Teensy 4.1 vs 4.0
I am having no problems with the display once I put in the source
termination resistor.
Been running for multiple days, so far.
--- Graham
On Tue,
Hi all,
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
like
I've got a shelf about 80cm long that I'd like to have 4 timezones
displayed on.
The obvious easy solution is go buy 4 clocks 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
played on.
>
> The obvious easy solution is go buy 4 clocks 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
Google and
"site:febo.com WWVB Transmitter" (or similar..)
I found this thread which you can take a look at.. There's probably
others, and some googling will find it.
https://febo.com/pipermail/time-nuts_lists.febo.com/2018-August/0
Appreciate the comments.
But back to the problem at hand.
Having a replacement for wwvb that drives cheapy wall clocks and icing on
the cake allowing phase tracking clocks to decode the time.
Fix the good clocks and the cheapies work. That said not wanting to get
crazy here.
I measured
...@alignedsolutions.com
604 762 4099
> On Aug 12, 2018, at 2:08 AM, Bob kb8tq wrote:
>
> Hi
>
> One would *guess* that stopping WWVB (and killing mom and pop’s “atomic
> clocks”) would not be a reasonable thing to do.
> It gets a lot of voters mad. I doubt that very many voters (percentage
minute process for the ES100.)
There is a deep drop in WWVB signal here every day at sunrise and sunset,
when the AM receivers will temporarily stop receiving.
I want to explore what happens to the ES100 during these signal nulls.
Learnings so far:
The chip does not accept a concatenated I2C read
that the 8 bit RTL-SDR isn't going to work on 60kHz.
>>> I don't know about the RTL-SDR, but 8 bits will get you quite far with
>>> slow moving time signals like WWVB because you can average for minutes
>>> if you want - provided you feed the ADC a good stable clock.
>
Fri, 31 Jul 2020 21:00:13 +
>> From: "Poul-Henning Kamp"
>> To: Discussion of precise time and frequency measurement
>>, Bob kb8tq
>> Subject: Re: [time-nuts] WWVB PM Time Questions
>> Message-ID: <85171.1596229...@critter.freebsd.dk>
&
Does the La Crosse UltrAtomic clock actually use a crystal filter or do
they digitally filter the signal? Has anyone ever looked inside of one
of the clocks? Just curious.
Ray
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB SDR discussion
From: Mark Haun
Date: Mon, August
chips and parts to prove I can
do it. That way I learn something new and kill time (no pun intended) in
the process.
Tom, thanks for the links. Interesting reading.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB PM Time Questions
From: Bob kb8tq
Date: Thu, July 30
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 whatever the Teeny does is locked to the 10 MHz. If that
> comes
> > from one
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