[time-nuts] Generating a solid PPS from 10Mhz source

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Jan 18 20:45:20 UTC 2016

In message <29659871.S9XTlaFu4r at linux>, Bruce Griffiths writes:

>To detect 100Hz modulation due to photocurrents in the LEDs the 150W 
>incandescent bulb had to be placed within a few cm of the LEDs.

Incandescent bulbs don't have much "hum" in their light output,
they're basically heating elements and they don't cool down nearly
fast enough.

Try with fluorescent light instead, there's a reason people accuse
them of flickering.

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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