"gareth" wrote in message
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"gareth" wrote in message
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wrote in message
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By that logic you could simply spin a permanent magnet and generate
an electromagnetic field, but you can't.
If you spin your permanent magnet at frequencies such that the
associated wavelength is a million metres, or thereabouts, then it
would be such a short antenna that there would not be enough radiation
from it to be detectable, (remeber that short antennae are poor
radiators, qv)

But, if you were to spin it at 1000 revs per sec (60,000 revs per minute)
then it would be a different matter.

As I was driving away this morning, I realised that I'd typoed, and then
misled myself about
the possibilty of using a jet engine. Nobody's perfect!

I had meant o say to spin at 1000MHz, or 1,000,000 revs per sec, for the
example.

For god's sake!!!! or 1,000,000,000 revs per sec!!!!!!!!!