[time-nuts] new WWVB BPSK dev board

[Club-Internet Clemgill]

Hi, 
The Allouis phase modulation is as follows : 
- sawtooth phase shift of the 162kHz carrier with 40rad/sec slope => +/- 1 rad shift => +/- 6,36Hz carrier frequency shift 
- sequence of full sawtooth periods of length 100msec => frequency 10Hz
- one full period sawtooth codes a « 0 » bit
- two full periods sawtooth code a « 1 » bit
- One bit only is coded per second in each minute =>  59 bits available because...
- 59th second is silent (no phase modulation)

Gilles. 

> Le 5 déc. 2018 à 16:27, Poul-Henning Kamp <phk at phk.freebsd.dk> a écrit :
> 
> --------
> In message <ff667468-278e-f875-b6a3-ea0f083d5bed at rubidium.dyndns.org>, Magnus D
> anielson writes:
> 
>> Looking at it using a Kiwi receiver just north of Stockholm, it comes in
>> nice and clean with 100 Hz sidebands from what looks like a PM whose 4th
>> sideband is nearly suppressed, so is 8th, 12/13, 21... so slightly more
>> that 4th and multiples.
> 
> It looks like both 162 and 198 has gotten more modulation after
> Loran-C disappeared, and I wonder if submarines are involved ?
> 
>> The Loran-C/Chayka plug-in does not calculate position, so already there
>> would be some fun little mini-project to attempt.
> 
> If only there were some Loran-C stations left :-)
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.
> 
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