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Re: electromagnetic (archive)

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Posted by andy r. on February 16, 1999 at 15:33:19:

In Reply to: Re: Mike, try this... (more) posted by Winston on February 16, 1999 at 09:55:11:

:
: Electromagnetic? Do you mean the key can be reprogramed if it's near a magnet? How does this thing work anyway? I'm just curious about the technology.

Same as the badges people wear to get past security doors at work nowadays. The car transmits radio waves at a certain frequency. The chip has a tiny antenna inside, fron which it pulls enough current to power up the chip and transmit back a coded signal. The car listens for this signal, and lets you start once it hears it.

It may be suseptible to *extreme* magnetic fields - like MRI machines, superconductors, electromagnetic cranes, etc - but I wouldn't worry about it.


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