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
My mistake the chronverter uses a pic 12f1840.
On Sat, Aug 25, 2018 at 8:23 PM, paul swed wrote:
> Have to look at what oscillators and crystals I have then a divide.
> Thats old style and most likely the junk box has everything.
> Have to look in my box of tricks as I built several chains for
Have to look at what oscillators and crystals I have then a divide.
Thats old style and most likely the junk box has everything.
Have to look in my box of tricks as I built several chains for the
de-psk-er experiments.
Have to agree on the micro the chronverter uses a pIC 12F64 as I recall and
it
Bob The generator sig is 60 Khz sinewave.but as a I build up a divider
chain and such your idea makes great sense.
Then filter to 60 KHz.
But I see the issue with the Chronverter carrier its 120-150 Hz high.
Bounces around a fair amount.
There could be a secondary issue in that the carrier may not
Hi
You can do the 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 wrote:
>
> From the earlier threads OOK modulation does not work for high end clocks
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
>From the earlier 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
resistors added DC offset and anttenuation so that the carrier drops by
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. &
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