Re: whats with this love of kaffiene?

On Thu, 2007-04-26 at 11:07 -0400, Gene Heskett wrote:
On Thursday 26 April 2007, Tim wrote:
Tim:
Sounds like they need to, also, employ someone who used to be a teacher.
Someone who's used to the idea of having to train, as the main thing
that they do.

Gene Heskett:
On the face of it, that is a good idea. Till that old saw about
"those who can't do, teach" comes crawling up out of the back of my
mind, having had it quite amply demonstrated in my nearly 57 years of
chasing electrons for a living. The other corollary to that is that
those who can do, and then try to teach, have a hell of a time trying
to reduce the language to something that actually works for TV-101
classes.

;-) Generally, we had the opposite problem at college. Teachers who
learnt electronics at college, then became teachers, were worse than
those who worked in the industry, then became teachers. For one thing,
they knew the difference between theory and practice.

I could never get any lecturer to give a sane explanation of AM. They'd
tell us that the carrier was a fixed amplitude. I'd argue that AM was
modulating the carrier, therefor it has a varying one. I'd even
demonstrate by cranking the pot up and down to give a 1 Hertz AM. None
of them could give a reasonable explanation. Yes, they could give
strange ones, but none that fitted the situation demonstrated.

I suspect they got lost someplace in the vector math, or the fourier
transforms. Both are damndably hard to explain to someone, like me, sorely
lacking in the math background to understand it. One of the disadvantages of
having only an 8th grade formal education. Beyond that, I'm self taught, and
have occasionally caught the teacher out & made him go back to the books. :)


Aptly put.

Math was my strong point, but I began my interest in electronics
in grade 6. I also tormented one prof who had no real world expertise
by pointing out his errors, and disproved one of his facts with
a demonstration when he called me on one of my objections. I did
not sign up for any more of his classes after I finished that one.

Yes, I know that you can put a 1 kHz signal on top of a 1 MHz one, and
then filter one away from the other. Theoretically, that's fine. But
it doesn't get around the fact that I had grabbed the pot and changed
the carrier level. It sure didn't have a constant carrier level in my
hands.

Yup, sideband analysis tends to break down when the circuit to do the analysis
is not physically realizable. The hand on the pot has the final word anyway.

--
(This box runs FC6, my others run FC4 & FC5, in case that's
important to the thread.)

Don't send private replies to my address, the mailbox is ignored.
I read messages from the public lists.



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Cheers, Gene
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More than the heart can bear,
Unhappiness remembering happiness.
-- Euripides

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