andrewbac...@msn.com said:
> Also -- when the GlobalTop loses a fix it still puts out the RMC sentence,
> just without the lat and lon data. And the PPS immediately stops. I
> designed the parsing scheme to account for that. How long that reporting
> would continue I don't know.
The RMC
From: time-nuts on behalf of Wayne Holder
Sent: Wednesday, September 5, 2018 5:49 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB Signal Generator
I was able to sort out my issue with the DST bits with the help of the
code Andy Backus recently published
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:
If your receiver has it the $GPZDA can be a better message to use. They
usually have better seconds resolution and some receivers give them some
special love as to when they come out. But, depending upon your code, this may
not matter. Also check to see if your chosen time message comes
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 a
My 15.36 MHz crystals arrived and using one to replace the 8 MHz crystal
seems to, again, improve the ability of the BALDR clock to lock onto and
decode the signal. It now reliably syncs if the clock is within 6-7 inches
of the tuned, ferrite rod antenna (still just wrapping the wire around the
> Wayne very good progress. You can actually feed the loop coild that exists
> with the cap it should resonate.
> Thats my plan at least.
Thanks, Paul. Actually, after running a few more tests, the BALDR seems to
now set quite reliably with the wire just wrapped around the ferrite rod as
long as
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
> design by
For anyone trying out my ATTiny85 code, I've done some additional tests and
find that placement of the antenna near the clock is very finicky and, so
far, the only way to get a reliable decode of the time in the clock is by
using a scope to monitor the demodulated output and then moving the
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
Hi
If somebody really wanted to go crazy on this, a link just popped up in my
inbox:
https://www.st.com/content/st_com/en/about/events/events.html/teseo-liv3f-gnss-module-webinar.html?ecmp=tt7108_us_enews_apr2018=stmDM10269=166175037=tEVjzOAFGOno6x6Htwrh8A==
Wayne always fun to see what others are doing and to learn.
I would imagine the programs pretty small and could be attached here.
How will you handle DST? Its a bit messy as a recent thread detailed.
Plus the fact that god knows why politicians like to screw with it.
Regards
Paul
WB8TSL
On Wed,
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.
Thanks,
Dana
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 1. I
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 neighbors
Hi
The gotcha is if you have neighbors two or three doors away that *also* put up
one of
these devices. You then have a real problem with the neighbor(s) in the middle.
The
wavelength is long enough that Raleigh issues won’t get you. You still have the
two
signals ( at slightly different
Agree with the conversation. With respect to neighbors when the day comes
they may ask you to boost your signal. :-)
Granted maybe the day won't come but at least having your local clocks work
is nice.
Regards
Paul
WB8TSL
On Sat, Aug 25, 2018 at 10:29 PM, Dana Whitlow
wrote:
> With the watch
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, within a few
inches of the
transmitter, reliable reception should be
This guy has what looks like a well thought out design using a Sirf-Based
GPS and ATTiny44A chip to generate a signal to update his watch:
https://www.anishathalye.com/2016/12/26/micro-wwvb/
Unfortunately, he doesn't seem to have published a schematic or his source
code. But, he covers enough
Great to see the threads. Take a look at the Chronverter.
https://unusualelectronics.co.uk/products/chronvertor/
Its done all of this. I don't get anything by promoting Daves design. But
am having very good success with it on my Spectracom and Truetime clocks.
I would like to look at the code
Hi Mark,
If you were able to include optional modulation for the UK's MSF
signal as well as WWVB, then I'd be very interested - especially if you
could persuade John and TAPR to produce a kit :-) Europe's DCF would also
be a good selling point, but getting its 77.5KHz would be more
Few moons ago, I was thinking about to connect little audio amp. with
attached usual WWVB ferrite antenna to the computer sound card. But I
was stack about how to modulate the signal using SoundCard libraries.
There is bunch of example how to generate sine or rectangles. The
question is how
If I was going to do it I would take a cheap Ublox 7M board (around $10 with
antenna), program one of the time pulse outputs for 60 kHz (it divides evenly
into 48 Mhz so no jitter), feed the Ublox serial data / 1PPS to an AVR chip
(or $2 Arduino Nano clone), and use that to modulate the 60
I thought I would search in a different way for a WWVB signal generator
design. I found this item. While the designer explains it isn't as
accurate as WWVB it may be another starting point.
http://www.tauntek.com/wwvbgen-low-cost-wwvb-time-signal-generator.htm
Donald R. Resor Jr. T. W. &
24 matches
Mail list logo
