[time-nuts] Receiving the MSF time signal on cheap radio modules

Bob kb8tq kb8tq at n1k.org
Wed Feb 7 09:31:35 EST 2018


Back in the era of VLF disciplined oscillators, carrier phase was the preferred approach. 
Getting that to work with 100% AM modulation took some effort ….


> On Feb 7, 2018, at 2:13 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> --------
> In message <CAGJ4F+697SyXwm3yWG-XczN4zF7r2RAmXzAcEm=dhaqBJc_NNw at mail.gmail.com>, "Deirdre O'Byrne" writes:
>> MSF disciplined oscillator?! I don't trust these receivers to any better
>> than about the 20ms mark, so such a disciplined oscillator would have quite
>> a long integration time!
> It's actually more complicated and better than that.
> The low-pass filter dominates, so the falling flank at second N
> depends on the pulsewidth at second N-1.
> I can't remember the numbers I got when I "sorted" DCF77 pulses depending
> on the previous pulse being short or long, but it was a fair bit better
> than 20ms.
> -- 
> 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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