Re: Lightning and Fourier transform of an impulse
- From: Chris Bore <chris.bore@xxxxxxxxx>
- Date: Fri, 8 Aug 2008 02:05:29 -0700 (PDT)
On Aug 6, 10:21 pm, Jerry Avins <j...@xxxxxxxx> wrote:
Chris Bore wrote:
But the frequency spectrum exists over all time, not just during the
impulse.
So I don't think this can be used to explain why the lightning
disrupts radio for a short time.
Chris,
The lightning isn't really an impulse. Some have durations of
milliseconds, few less than tens of microseconds. That's more than
enough to localize the interference in time.
...
Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Jerry,
I agree but..
Frequency, as defined by a Fourier Transform, is a steady state
frequency spectrum whose components exist at fixed amplitude over all
time.
So the Prof can't use the broadband nature of the frequency spectrum
to explain a time-limited event. He is mixing orthogonal domains.
He can say the spectrum is broadband. But he can't say the spectrum is
somehow broadband for a short time.
I think the Prof should have accepted that lightning interferes
because it is a bloody great spark, and left it at that.
Chris
================
Chris Bore
BORES Signal Processing
www.bores.com
.
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