Re: 3 dB bandwidth




Joerg wrote:
>
>Hello Larry,
>
> >... So it is readily calculated by hand,
> > (as things were when that standard arose).
>
>Hey, they still are. I have one calculator in my drawer (HP11C) but
>several slide rule calculators. No abacus though.

Addiators work better for addition and subtraction, and are still
100% mechanical. There are usually a few on eBay cheap because
many were made and few people collect them. (Always contact the
seller and confirm that the slides move freely and that the numbers
are still readable).

>Thing is, if the power goes out I can keep going. A long time ago they
>pestered me about it at a client's lab and one of the engineers bragged
>about a new calculator with "continuous memory" that didn't fail when
>the battery died. I told him my slide rule had continuous memory as
>well. The slider...
>
>Then one day a company came out with a slide rule calculator that had an
>LCD and buttons. That almost made me sick.

I remember that one. The calc only added and subtracted. There was a
sliderule with an addiator on the back too.

Back to the topic, 3DB is also the amount of drop you get when you
have the output impedence and the input impedence matched, which was
common in the days of transformer-balanced audio lines.


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