On 3/3/13 10:09 AM, Poul-Henning Kamp wrote:
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In message <51336234.3090...@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:
http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/17005/1/99-0421.pdf
http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/17761/1/99-1204.pdf
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