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Comment by babuskov | Hacker News Reader

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babuskov·

Does the freezer really act like a Faraday cage?

Quick Google search suggests it isn't really effective:

http://mentalfloss.com/article/51597/does-refrigerator-make-...

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Your microwave oven is likely a better choice, since its faraday cage-like behavior is required for both safety and regulatory reasons.

And your key battery will thank you... Freezer would kill the battery in a few days of such treatment.

Killing the battery isn't a bad idea either, actually :)

(Usually there's a recessed traditional key in the fob that you can use as a backup)

Sure. Or maybe requiring to put a key in the lock! Oh wait...

Wow, I didn't think of it until I read your comment, but it would be super easy to add a switch to my fob!

With little more than a cap, you can throw on a button that enables the feature on for a period of time then disables it again.

... Unless you have a push button start...

Unlikely, assuming a lithium cell.

Be careful not to turn it on though (yes, there's a story behind that ;( ).

I can tell you it isn't for mine. I have a Mother cookie sensor in there reporting in near real time the temperature wirelessly.

It depends on the frequency of the signal that the key uses. I forget the formula, but to be a good faraday cage the cage needs walls of thickness proportional to the wavelength of the signal.

Wait I thought it was minimum interstitial spaces between conductive cage elements proportional to lambda.

attenuation is related to both. Once the holes are much smaller than the wavelength though, only the thickness matters.

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