Excellent idea to use the harmonics and sound card ! Thanks ! I'll try
to experiment with that. Probably using some coil instead of headphones
will eliminate the sound at all.
Then whole project will be kind of trivial with almost no HW work
required. Just another "daemonised" process running on my NTP machine
which push the WWVB through the soundcard.
Interesting ! Thanks again !
On 2016-11-02 13:35, Tom Van Baak wrote:
Hi Vlad,
There's lots of postings about this in the archives. For playing at
home I usually use a GPSDO/1PPS as the time reference and don't worry
about how accurate the 60 kHz carrier is. There should be lots of
postings in the archives about all this.
The code itself is very simple. See for example:
http://www.leapsecond.com/notes/wwvb1.htm
You can also use PC audio through headphones as a transmitter for
*both* the carrier and the subcode:
https://www.febo.com/pipermail/time-nuts/2011-November/060937.html
/tvb
----- Original Message -----
From: "Vlad" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Wednesday, November 02, 2016 9:05 AM
Subject: Re: [time-nuts] WWVB software for PC
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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--
WBW,
V.P.
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