[time-nuts] WWVB software for PC

Vlad time at patoka.org
Wed Nov 2 16:04:08 EDT 2016

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" <time at patoka.org>
> To: "Discussion of precise time and frequency measurement" 
> <time-nuts at febo.com>
> 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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