Has anyone probed the test points (which Tom so kindly took pictures of) to
find the pps & i2c lines between the es100 and clock face microcontroller
on one of these?
I'd like to build a WWVB refclock for fun, but with the
universal-solder dev board discontinued, buying a wall clock s
:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
John sent the link on the teensy wwvb AM receiver. It can easily be shifted to
other frequencies. Using the work Frank dcf77 and then Chris wwvb did with the
PJRC audio
On Sun, Mar 14, 2021 at 07:43:03PM -0700, lmcdavid wrote:
> I have 3 WWVB AM clocks that did not update DST overnight last night
> but one that did and two BPSK clocks that did. Par for the course. The
> BPSK clocks always set correctly within 10 minutes any time of day.I
l for a
special receiver. This little board can generate a number of different
timecode signals including WWVB, see the documentation on the web site.
The original Chronvertor have now been replaced by a new board which at
the moment is marked 'out of stock' at the moment, but send
There are software "emulators" for WWVB, JJY, MSF, DCF77 available for both
iPhones and Android phones that transmit very low power time signals through the mobile
phone speakers as a harmonic.
See
https://play.google.com/store/apps/details?id=jp.houryo.wwvbemulato
Achim
Indeed anything could be used if you want to modify the clocks. I don't.
They do what they do very well and consume 0 power.
Can be placed in any location in the house or garage and even the basement.
Interestingly without the real wwvb I can orient them any way I want also.
The last th
or what it is but easier to work with than gutting a working
>clock and no more expensive.
>
>I ordered one. Curious to see what sort of precision we can get from
>an i2c interface.
>
>If nothing else I suppose I can toss a six digit i2c 7 segment module
>at it and roll my own
Thanks, Tim, for the info on an interesting device.
BTW, has anybody yet heard definite news on whether or not WWVB will still
be
operating much longer?
Dana
On Tue, Dec 25, 2018 at 8:26 AM Tim Shoppa wrote:
> I let the Universal Solder ES100 board run overnight in my basement in
> Ma
I want to decode the WWVB time information using the BPSK information
that is broadcast. I will use a STM32 to do the actual decoding of the
bit stream. This is just an exercise in "can I do it?" as I know I can
buy clocks for $30 that use the BPSK method. At one time you could buy
e antenna.
>
> Ray
>
> Original Message
> Subject: Re: [time-nuts] WWVB Dephaser Question
> From: Bob kb8tq
> Date: Thu, October 08, 2020 12:40 pm
> To: Discussion of precise time and frequency measurement
>
>
> Hi
>
> A lot depends on your an
housing
> > >> > that will reject RFI, etc.
> > >> >
> > >> > Thanks for mentioning this. I have ordered one of those nice
> antennas
> > >> > from Stormwise but I'm still waiting to receive it.
> > >> >
&g
Some US states are mulling proposals to adopt Daylight Saving Time year
round -- I'm aware of California and Florida, for example.
It occurs to me that if states in the Eastern time zone (UTC-5; UTC-4 in
summer) adopt year-round DST, this will break WWVB-based "atomic clocks"
of the year I may have some time over the holidays to do acquisition test
> > from Maryland and maybe some cross-comparison with GPS PPS.
> >
> > Here in Maryland I have somewhat unreliable reception on commercial
> > non-BPSK WWVB clocks at my house. My Casio Waveceptor
...@atcelectronics.com
Sent: Tuesday, July 21, 2020 7:37 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] WWVB PM Time Questions
I want to decode the WWVB time information using the BPSK information
that is broadcast. I will use a STM32 to do the actual decoding of the
bit stream. This is just an
Hi
> On Aug 8, 2020, at 7:18 PM, Bill Byrom wrote:
>
> Yes, the weather can change the phase of the transmitted antenna signal
> unless corrections are performed. From the WWVB (60 kHz VLF time/frequency
> station at NIST in Fort Collins, CO) website at
> https://www.nis
Hi
At least to me, anything dimensioned in the 100’s of feet is “massive” compared
to
the rod antennas normally seen in WWVB use ….
The other point being that if the antenna is some sort of large loop, it’s
going to be
a good long ways away from the receiver. You get both a larger signal
That would be a great neighbor to have but I can tell you around here its
the phone. Not to concerned about someone putting up a wwvb replacement.
And I can always up the power. Chickle.
Regards
Paul
On Sun, Aug 26, 2018 at 2:34 PM, Bob kb8tq wrote:
> Hi
>
> The gotcha is if you have
mentation and knowledge has come from
> Frank
> > and Chris, who built the complete wwvb AM time receiver. In addition
> > and important is Johns KD2DB BPSK receiver. There is a reason this
> matters.
> >
> > The teensy combination is powerful and somewhat easy to use. (Ha
I did reach out to unusualelectronics and ordered a chronverter.
The building block for the lazy mans wwvb replacement. It showed up today.
Maybe a week out of the UK. Pretty amazing David.
Have not done anything yet but over the next week or so will get things
fired up.
With respect to WWV that
Hello to the group.
You may remember the wwvb d-psk-r from 2015 or not. It still lives. That
said I would like obtain a Truetime DC-60 because its very easy to work on
internally.
Looking to build a test instrument for looking at the phase shift in the
message. I have done it for years using a
On Mon, 31 Dec 2018 17:47:56 -0800 Wayne Holder wrote:
Interesting thought. I wonder if anyone has tested WWVB reception in a
deep underground location such as a sub sub level in a building or parking
garage?
* * *
Many years ago when the San Francisco rapid transit system (Bart) was
Well if the old LF and HF signals go away I am on for yet another wwvb
project and wwv. What the heck.
Creating a AM wwvb is really pretty easy and in fact I have done that.
Can't remember what code that was.
Pretty sure it was basic on SXb2. But the good news is the old BPSK code
isn't
Paul,
I live in Central Florida, which is pretty much the furthest point WWVB in
Colorado is expected to serve. My house is all LED. Street lights in my area
are about 50% LED. Amazingly, my Casio watch still syncs up. Using measuring
receiver, I was also able to hear what must be the WWVB
I have a MAS6180C AM receiver chip, on a board with a few other parts to
complete the receiver. I did not make the board, it came from
Universal-Solder Electronics in Canada. The date on the chip datasheet
is 2014 and on the receiver board 2016, so after NIST messed up WWVB in
2012.
Robert
multiple walls
between WWVB and any location in my home. Same goes for a no name wall clock I
got three years ago.
Watches the leather armbands deteriorated over time.
An external ferite rod worked great for frequency along a Tracor Omega receiver
for 42 years.
Bert Kehren
In a message dated 8/13
Now that I have my WWVB simulator
<https://sites.google.com/site/wayneholder/controlling-time-2> up and
running it's allowed me to experiment with the BALDR Model B0114ST clock I
own. I've always been curious to observe what happens when it detects and
set the time but, typical
r 27, 2018 4:01 PM
To: Time-nuts
Subject: Re: [time-nuts] WWVB Translation
Andy pretty much what I did also. A loop in the basement as suggested by a
time-nut.
Radiations quite low depending on the floor of the house and walls its
100uv to 30 uv.
Did resonate it with a cap that seemed to improve t
Hi
You *are* talking about a 60 KHz sine wave when playing with WWVB. The
typical receiver had a fairly narrow passband. This generally was accomplished
with both high Q tuned circuits and a crystal filter. The typical antenna loop
antenna
also had a fairly high Q tune on it. Even if the signal
; any receiver. Everything has always been released to the time-nuts group.
> As they say have fun.
> Regards
> Paul.
> WB8TSL
>
> On Thu, Oct 8, 2020 at 5:39 PM wrote:
>
> > Bob,
> >
> > I am using a ferrite rod antenna for the receiver. No outside ante
It's worse than that, not just WWV, WWVH, but also WWVB:
This is an exact quote from page NIST-25 of the proposed FY2019 NIST budget:
"NIST will discontinue the dissemination of the U.S. time and frequency
via the NIST radio stations in Hawaii and Ft. Collins, CO. These radio
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
In message <2e7cf0ff-4094-2750-4874-96dfe2efe...@earthlink.net>, jimlux writes:
>I'm going to bet 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 bec
The ES100 module sold by universal-solder.ca which Tom introduced us to a
couple years ago, is now End-Of-Life. "A new module is currently in
development".
https://www.universal-solder.ca/product/everset-es100-cob-wwvb-60khz-bpsk-receiver-kit-with-2-antennas/
I myself did some exp
t...@leapsecond.com said:
> Use a ES100 board [2] to receive the real BPSK WWVB and then generate a fake
> AM WWVB signal for the 24h clock to receive. That way you get the enhanced
> reception of the new format and the wide clock selection of the
Transmitting on the same frequenc
Good morning group,
Wanted to see if anyone has a lead on a truetime 60-TR manual? I’m bidding on
one via eBay, not sure of its condition. It’s another WWVB receiver, so I will
likely have to do the conversion to make it compatible with the new modulation
scheme.
I’m also trying to figure
I hope that those of you who write code to generate the WWVB signals in real
time from a GPS receiver's output will publish well documented source
listings.
I for one want to learn how one does this kind of thing in 'C', both for
general
interest and for this specific application.
few inches, something that you can
hold in your hand.
It's harder to make a WWV jammer (.5, 5, 10, 15, 20 MHz) since a 1/4 wavelength in in the range of 500 to 12 feet,
something that can be mounted on a vehicle for the higher frequencies.
But it's extremely hard to make a jammer for WWV
On Sep 7, 2018, at 2:49 PM, paul swed wrote:
>
> Nick
> Been watching the thread and building a replacement for wwvb. Cause darn it
> I like my spot specific always accurate clocks. However that said the next
> generations of time users for general life only have one clock and i
John I don't think so as not sure how many have built a large antenna.
Certainly any of the old wwvb receivers have details and thats pretty much
what most people copy.
Essentially a 3 foot copper loop with numbers of turns of wire connected
together. Like 25 pair telco cable connected end t
While reading this thread and pondering whether to buy and fool around with
an ES100-based module from Universal Solder, I suddenly found myself
wondering if there was any advantage to using the time received from WWVB
vs just using an inexpensive GPS receiver. The ES100 module costs about
$70
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 like WWVB?
Ray
Original Message
Subject: Re: [time-nuts] WWVB PM Time
in the 100’s of KHz range. If you are
only
trying to come up with an analog of a WWVB signal the “10 bit” D/A’s found in
some MCU’s would do the trick. In the setup above, the ADC would likely be
harder to come up with than the DAC.
Since you are only trying to come up with a carrier, the need
aul 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
> > that I will have to get back into it again.
> > I did loo
dels
from the junk is part of why you have lists like this one.
>
> I routinely use WWV to verify correct setting of my WWVB-synced watch and
> kitchen clock. I have
> occasionally seen severe setting errors, which I attribute to attempts at
> syncing in the face of poor
> WW
te:
>
>> With the watch being physically close to the faux WWVB "transmitter", one
>> is in
>> the so-called "near field" regime, where the field strength (V/m) falls as
>> the inverse
>> cube of the distance. If one is putting the watch, say, withi
ld spectrum analyzer, which is
running on it's own without any computer connection, and you will what
is out there, sweep so between 35kHz to 100kHz use one coils as antenna
with a diameter of 2' to 3' and at least thirty turns. With that set up
you will be able to see WWVB to. If y
usec
level of accuracy, but most do not.
I routinely use WWV to verify correct setting of my WWVB-synced watch and
kitchen clock. I have
occasionally seen severe setting errors, which I attribute to attempts at
syncing in the face of poor
WWVB reception conditions.
My impression is that none of the
Hi
I think there are a lot of ways to come up with a “local” WWVB signal that has
all the
DST stuff in it (or not if you prefer …). There’s not a lot of code or
development involved.
Even with the current shortage of parts, there are an ocean of dirt cheap MCU’s
and boards
to pick between
s a six digit i2c 7 segment module at
> it and roll my own WWVB desk clock.
>
> —msa
>
> > On Dec 4, 2018, at 07:50, paul swed wrote:
> >
> > I assume thats exactly the case. I also thought it was pretty high.
> > The actual clocks are about $50 or less I be
Try looking up the "Costas Loop" and the "frequency doubling loop". They
should
give you some ideas of how to generate a stable local reference.
Dana
On Tue, Jul 21, 2020 at 7:47 PM wrote:
> I want to decode the WWVB time information using the BPSK information
> tha
one to have. The new de-psk-r I
built has no raw wwvb outputs. I debated about adding one. Woulda shoulda.
Appreciate you jumping in.
Regards
Paul
WB8TSL
On Wed, Jul 29, 2020 at 10:00 PM John Magliacane via time-nuts <
time-nuts@lists.febo.com> wrote:
> Greetings to the group!
>
> I&#
7;s 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/
73's,
John
AJ6BC
On Mo
e IC's 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-m
rmonic (probably 3rd of 20 kHz).
> The watch or clock has to be placed next to the phone speaker for it to
> work.
>
> Ray, AB7HE
>
>
> On 2021-12-11 06:43, Attila Kinali wrote:
> > On Fri, 10 Dec 2021 15:54:55 -0500
> > "Lawrence Brandt" wrote:
On 8/20/18 4:17 PM, ew via time-nuts wrote:
They're cutting a lot more than WWV/WWVH/WWVB - they're cutting 300+
folks in the labs doing all sorts of things.
Download the doc that Rick posted the link to, go to page NIST-24 and
start reading..
I don't know enough about h
The "Two High Gain Antennas" feature is laughable :-)
On 12/31/2018 8:57 AM, Patrick Murphy wrote:
Just a heads-up. Universal Solder has two different ES100 devices back in
stock.
https://universal-solder.ca/product/everset-es100-cob-wwvb-60khz-bpsk-receiver-kit-with-2-anten
Bob kb8tq writes:
>The WWVB modulation is *very* predictable. Once you have lock,
>you can guess just about every phase reversal you will see.
>[...]
>The point of this being that you *could* pre-flip the data before it
>went into a buffer. That way the buffer integratio
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/
"ES100 datasheet, including block diagram, applic
Just to be clear, is the ES-100 the receiver used in the Ultratomic clocks
made by Lacrosse?
Dana
On Thu, Oct 29, 2020 at 7:38 AM Ben Hall wrote:
> Good morning all,
>
> Universal Solder is showing the ES-100 WWVB BPSK clock kits back in
> stock. Just put me one on order. :)
&
My clocks did update and I have one that lags by 2 weeks due to its very
old internal software. It flips on the old date. WWVB was indeed down in
the noise this afternoon as John mentioned.
Regards
Paul
WB8TSL
On Sun, Mar 14, 2021 at 10:23 PM wrote:
> Strange, here in KS one of my 60 kHz clo
Robert DiRosario writes:
> I really wish NIST didn't add the BPSK modulation to WWVB. Increasing
> the transmitter power would have been a lot better, but I'm sure that
> would have cost a lot more then just changing the modulation.
One does not simply increase th
by -14
db per the wwvb spec. The logic control is driven from the chronverter and
it totally works. Spectracom Netclock 2 locked up in the normal time.
There are far better modern single supply analog gates that will work. Just
did not have any.
The 60 KHz carrier is supplied by a fluke 6060 genera
Instead of relying on the PPS to time the start of the simulated WWVB
transmissions, I opted instead to rely on the Arduino timing functions and then
refresh the data and the start every five minutes. No WWVB clocks use the
signal continuously; generally they all copy the signal once a day
I let the Universal Solder ES100 board run overnight in my basement in
Maryland for 10 hours, its little loopsticks at least 5 feet from switching
power supplies, and it often could get successful WWVB BPSK decodes.
This is a feat in itself. No non-BPSK WWVB clock antenna has ever produced
a
Jan 1, 2019 at 4:05 PM Hal Murray wrote:
>
>>> GPS has no bits for Daylight Savings. As far as I know only WWV and WWVB
>>> have those bits. So for a clock displaying local time WWVB is the way to
>> go.
>>
>> WWVB's DST data is targeted at the US.
>>
cks, ranging from
> commercial cesium clocks and H-masers to "homebrew" cesium fountains and
> optical clocks. The WWV/WWVB transmitters an hour north in Fort Collins,
> CO and use a couple of 5071A cesium standards as their local reference.
> Last I saw, Ft Collins is held
I don't have one of those modules. But I believe that most or all such low cost
WWVB modules sold on Amazon (and similar distribution sources) use an IC from a
Finnish company (Micro Analog Systems). They have produced several different
chips over the past 16 years for use in clocks whic
et cuts to further their own ends. Involving a
few congressmen or senators might make a difference in a case like
this since it affects the general public.
Best,
Bob Martin
On 8/20/2018 3:51 PM, Bob kb8tq wrote:
Hi
Ok, if it really does include WWVB, that gets a lot of mom and pop voters a
Paul,
You really don't want to be building an antenna that radiates energy, which
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.
T
On Fri, Sep 7, 2018 at 4:50 PM paul swed wrote:
> Mobile phone time is good enough.
And is often pretty darn good.
Should WWVB go off the air (and it's far from certain that it will),
there might be a market for a USB dongle that plugs into a PC that
outputs the correct code on 60 k
paul swed writes:
> 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.
I am still a bit puzzled by this desire to feed the time in via LF
waves. Maybe WWVB clocks are more different from the MSF /
g for the 60KHz
remodulator with cmos and a 15.36 MHz oscillator that draws 11ma. Should
have re-used that.
The whole system chronverter, neo6, and modulator draws 150 ma.
Used a dead bug approach on a copper pc board to build it. Its pretty small
and very fast to build.
So all set for the day that wwv
the basic question of how the IRQ flag relates to the time the
chip “sees”. If it’s actually WWVB time sync’d then that’s a useful thing.
None of this is likely to be an issue in a wall clock. If they can run at a
“tens of ms”
sort of level that’s more than good enough. We really want to get to
Paul,
Yes, I built the d-psk-r per the schematic. However, I think I did not
understand how it actually worked. I was expecting it to be able to
duplicate the WWVB sine wave signal with the phase reversal present when
the PM data bit changed from a 0 to 1 or 1 to 0. I have a 60 kHz sine
wave
Behalf Of Lester
Veenstra via time-nuts
Sent: Friday, August 21, 2020 10:56 AM
To: 'Discussion of precise time and frequency measurement'
Cc: Lester Veenstra
Subject: Re: [time-nuts] WWVB SDR discussion
Thats a unavailable EBAY listing number What is the actual La Crosse model
or part numb
Hi folks.
Just a quick question, but I found a small AM/FM radio here (50p!) with a tiny
ferrite rod.
Wonder what it uses to set the frequency for AM range?
Surely not a tuning diode like MV1404 as these are incredibly expen$ive.
Was wondering about pulling the rod and modifying it for WWVB as my
x27;t suppose there's any passive repeater solution for WWVB, e.g.
> antenna in attic feeding coax to another, hopefully smaller antenna to
> reach radio clocks with less-than-adequate built-in antennas in more
> unfortunately shielded parts of a house? Similar to how Community Antenna
Hi
It’s a good bet that whatever the spec on that Isotemp OCXO, it’s way better in
terms
of temperature and aging then the DS3231. Is it still on frequency (however
many years
later …..) who knows ….
Many of the “time oriented” WWVB devices stopped working when they put in the
new
modulation
As a follow up, I now have a simple WWVB simulator written in C that's now
running an an ATTiny85 using nothing more than the internal, 8
mHz oscillator and about a 6 inch length of wire connected to one of the
pins as an antenna. It generates an approximate 60 kHz signal using PWM on
timer
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 maybe work:
If a micro is able to detect the zero crossing of a sine wave it
chip from
decoding the time.
It's possible the difficultly with locking onto my simulated WWVB signal
may be partially due to the design of the clock (from my location it's
never been able to to lock onto the real WWVB signal), but I have no
reference to compare it against so, for now, I ha
Working on the wwvb simulator and it works really well. On to the last
piece. Transmission over maybe 30 ft.
Ever notice everyone that makes a simulator has the clock on top?
Well thats because its pretty hard to get a 60 KHz signal actually out.
Even though I know loopsticks are not great
nosphere.
At VLF frequencies the wavelength is comparable to the height of the
ionosphere (D layer, 70-90 km above earth's surface), so we have
"waveguide propagation" in the "earth-ionosphere waveguide". The WWVB
phase changes occurring during sunrise and sunset tra
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 code from a GPS
clock). The biggest problem I find with my WWVB clocks is getting a good
signal, which is highly depend on location in the house and
; Also it would be great if the oscillator was something that could be
> obtained at a reasonable cost. I do not believe at all it has to be a
> OCXO as the older true time and spectracoms were not and they locked solid.
> So its a case of getting the control voltages right.
As Paul corr
go to
-3dbm.
Regards
Paul
On Wed, Aug 19, 2020 at 3:49 AM wrote:
> Paul,
>
> Yes, I built the d-psk-r per the schematic. However, I think I did not
> understand how it actually worked. I was expecting it to be able to
> duplicate the WWVB sine wave signal with the phase revers
identification for WWVB and
> also served as a marker for chart recorders. The shift occurred from
> 10-minutes past the hour until 15 minutes past the hour.
>
> Before GPS came along, WWVB was my main frequency
> standard/reference. I had two Gertsch RLF devices and a "thumper&q
DiRosario wrote:
> I have a MAS6180C AM receiver chip, on a board with a few other parts to
> complete the receiver. I did not make the board, it came from
> Universal-Solder Electronics in Canada. The date on the chip datasheet
> is 2014 and on the receiver board 2016, so after NIST messe
> Hi
>
> One of the “interesting” things about the phase modulation on WWVB is that
> it does not get converted to
> AM (and thus mess things up) in the front end filters of the typical
> watches and clocks. The filters also do
> not strip off the AM modulation sidebands of th
of RFI issues that take out GPS from a TV preamp can equally
well take out WWVB or WWV.
With WWVB, there are a *lot* of 60KHz switching power supplies out there to
create problems. There is nothing
unique about any of these services in terms of being jam immune.
The bigger issue with any of
t’s better than signing an NDA simply to look at the slides ( which some
other vendors seem
to want you to do).
Bob
> On Aug 29, 2018, at 4:55 AM, Dana Whitlow wrote:
>
> I hope that those of you who write code to generate the WWVB signals in real
> time from a GPS receiver&#x
For those that have asked for my to publish the source code for my
ATTiny85-based WWVB simulator, I have put up a somewhat hurriedly written
page on my google site at:
https://sites.google.com/site/wayneholder/controlling-time
that describes a bit about how the code works, how to compile it
Ray,
> How do the La Crosse distributors sell the ULTRATOMIC clock for $35-$40.
That's a bit lower than a few years ago when it first came out.
> Building a million clocks would get the cost down,
In this case, likely thousands not millions. The market for WWVB clocks
took a hit
For my little WWVB project I used the table saw to cut off the
upper 3 inches of a 5 gal bucket from Lowes (having removed the handle
first).
Then I wrapped that with about 30 turns of enameled wire from
an old TV flyback transformer. I then measured the inductance
and added the required
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* of manmade
noise at
large receiver onboard the ship.
But back to the 8161.
Regards
Paul
WB8TSL
On Mon, Oct 5, 2020 at 3:03 PM Bob kb8tq wrote:
> Hi
>
> You *are* talking about a 60 KHz sine wave when playing with WWVB. The
> typical receiver had a fairly narrow passband. This generally was
> accomplishe
Hi
The “simple” approach is to generate the full modulation pattern
for the signal based on a “known good” time source. There are a
couple of ambiguous bits so it will only be close. Feed that into
your inverter and the result will be (near) clean WWVB. Since you
never demodulate the WWVB
advised.
>>
>> There is also a smart phone app that does the same thing. It uses the
>> phone speaker somehow to generate a harmonic (probably 3rd of 20 kHz).
>> The watch or clock has to be placed next to the phone speaker for it to
>> work.
>>
>> Ray, AB7HE
>
s
long as the clock is with 2 inches of the ferrite rod. I'm using the WWVB
receiver module in another experiment, so I don't want to risk damaging the
module by applying a 5 volt PVM signal to the coil. But, I have a another
WWVB receiver module on order so, once it arrives, I'll
, Aug 29, 2018 at 4:35 AM, Wayne Holder
wrote:
> As a follow up, I now have a simple WWVB simulator written in C that's now
> running an an ATTiny85 using nothing more than the internal, 8
> mHz oscillator and about a 6 inch length of wire connected to one of the
> pins as an anten
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