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Old 09-03-2012, 16:53   #31
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Re: Hydroponic Gardening and Getting Off the Grid

Originally Posted by foolishsailor View Post
Everyone please stop spreading this old wives tale. An oven most sefinitely does not work as a faraday cage, especially at the wavelength of an emp like that produced by a lightening strike which would be in the low milmeters? (please would an EE step in for clarity?)

For a faraday. Age to work there can be not gaps in the metal cage larger than the wavelength of the energy you are trying to protect against. On your oven is their glass? Is there any gaps between the door and frame, etc...
Off topic I know but...
The frequency (& thus wavelength) of a lightning produced EMP is very broadband. By definition (& Fourier analysis), it contains all frequencies but some much stronger than others. I found this

"the EM Field you would expect to detect at ground level 1.5-2km from the strike can be divided into two linear sections.

Section 1 drops at 20dB/decade to 100MHz
Section 2 drops at 45dB/decade above 100MHz"

on this site RF emitted from Lightning strikes

So it would seem the stronger fields would be low frequencies and dropping off rapidly after 100MHz.

If correct, then gaps less than 3cm should be acceptable. Any good (and clean) microwave oven will shield frequencies below 2.5 GHz (gap size about 1mm).

Back to gardening.....

All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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