Chris,
Thanks for the quick reply ! I am thinking to use something like
Raspberry PI + little "periphery" to transmit on 60Khz. May be General
IO pins and some buffer (like 75179) plus loopstick antenna will do the
trick. I have a NTP server in my lab which sync by 1PPS coming from
T-Bolt. So, the source should be good enough to sync the wrist watch.
The uP project I have - was bought as a kit. So, I am not the
author/creator of that. I just get parts together and put them to the
nice project box.
I think I am capable to create such thing by myself, but its probably
not worth to re-invent the wheel. I think the idea is already "in air"
For example: Circuit Cellar 2014 Digital Archive: Issue 288 July 2014,
page 57-
The phase modulation is interesting feature to have. Its in my "long
waiting list" to have a look to it more closely and probably try to do
something like this.
On 2016-11-02 13:07, Chris Albertson wrote:
If the PC's clock is being disciplined by NTP oe "whatever" the WWVB
simulator would not even have to "know" and would just use the system
clock. So I doubt you will find a simulator that explicitly makes
use of a reference clock. For your purpose the PC's clock could even
be set using Internet pool servers, typically this gets you to within
a couple tens of milliseconds. The GPS will keep the PC's clock ate
the tens of microseconds level, You don't need that for setting wrist
watch.
One problem is the new phase modulation that WWVB is using. If you
want to emulate that you might want to use an audio interface that can
output the 60KHz RF signal directly. Most audio interfaces only go
up to about 20KHz. You need the 60KHz interface so you can keep the
phase aligned with the UTC second.
Software would be easy to write, just output 60,000 numbers per second
to the port.
But if you already have a uP that can simulate WWVB why not just add a
little bit of code you read the tie of day over a serial port
On Wed, Nov 2, 2016 at 9:05 AM, Vlad <[email protected]> wrote:
I am wandering, if anybody seen the projects like WWVB simulation
(transmitter) using GPS/NTP/whatever as a time reference ?
I have something similar, which is generic PIC MCU with connected
WWVB antenna. This box generate WWVB signal for very short range.
However its handy for developing/troubleshooting the WWVB receivers.
There is no fancy parts on that - just an WWVB antenna, which many
"travel radio clock" has under the hood. Unfortunately those box
using internal oscillator and every time it needs the time to be
setup on it.
The reason to have "GPS-2-WWVB" could be use it to sync. some
watches without relay on WWVB signal propagation. Sometimes its a
challenge to get WWVB in big cities because of location and QRM.
--
WBW,
V.P.
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--
Chris Albertson
Redondo Beach, California
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--
WBW,
V.P.
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