[time-nuts] webcam app to watch for and time stamp changes
jimlux at earthlink.net
Sun Mar 3 13:44:54 EST 2013
On 3/3/13 10:09 AM, Poul-Henning Kamp wrote:
> Content-Type: text/plain; charset=ISO-8859-1
> In message <51336234.3090105 at earthlink.net>, Jim Lux writes:
>>> Most LCD and LED clocks have a shielding metal-coating on the front
>>> glass, exactly to eliminate all EMI/EMC issues.
>> Yes, but perhaps there's enough leakage to make this work.
> Think for a moment about how little power the electronics consume
> in the first place, then do the math.
> You'll need a very (radio-)quiet place to measure in...
Not so oddly, I happen to have such places available, since we develop
sensitive radio receivers and instruments for deep space. I don't know
how well shielded from a magnetic field standpoint our usual screen
rooms are (probably not very.. they're all designed for 2GHz and up),
but it's easy to try.
I also know someone who has a set of nested mu metal cans for this kind
of thing that I might be able to borrow.
We used them to calibrate little hockey puck shaped spinning
magnetometer subsatellites for a sounding rocket experiment:
More information about the time-nuts