Re: 3 dB bandwidth

Mike Monett wrote:

> Pooh Bear wrote:
> >
> > Tony Williams wrote:
> >
> > > The Decibel is a Unit of Attenuation,
> >
> > It's just *attenuation* now is it ? Snip rest of trolling garbage.
> >
> > Holy *** !
> >
> > Graham
>
> Graham,
>
> Please be a little more tolerant.

Mike, in normal circumstances my tolerance knows almost no bounds ! I am
*phenomenally* tolerant. Ppl who know me well comment on it ! When it comes
to plain lies however I have *zero* tolerance.

> As you know, gain can also be understood as a form of attenuation.

Rubbish ! Gain means a ratio > 1. Attenuation means a ratio < 1. These are
*explicit terms*. Note that I have also mentioned ratios and ratiometric
measurements in my discussion of this topic and intentionally avoided any
reference to unity.

> In other words, gain = - attenuation

Oh please ...... I accept you're being apologetic for Tony but is it
necessary to stoop that low ?


> Tony Williams is one of the oldest members of sed, and he rarely gets
> involved in stupid arguments such as this. If you look through the
> archives, you will find his contributions are often quite brilliant and
> certainly far above the general level we now experience in this
> newsgroup.

Indeed, he helped contribute to my call for assistance re the 3525. Thanks,
Tony.

Being well considered and an able person does not absolve him from criticism
when he makes totally fatuous comments though. Indeed, as a respected member
it's incumbent upon him to be accurate in the advice he gives.

> Tony is not a troll, and it is ungenerous to refer to his post in such a
> manner.

Ungenerous ? Maybe.

Was he talking crap ? Yes !

For those who haven't got it yet - pls consider the VIR 'triangle' that
defines V=IR, I=V/R and R=V/I.

To talk about power dB ratios being *pure* and voltage dB ratios somehow
*unpure* is bonkers. It smells like some perverse electronics fundamentalism
or whatever.

If P=V.I , then by inspection it's equally I^2.R or V^2/R. None can exist in
isolation.

I'm staggered that anyone can even fail to realise this and see that you
simply adjust the relevant equation according to take account of any square
power terms.

Note that the dB ( indeed the Bel actually ) is just a mathematical
convenience that's great for dealing with large ratios in particular.

And as for whoever said someone wrote a book 71 yrs ago that said dBs only
applied to power..... It was wrong then and it's still wrong ! I'll write a
book refuting it if you like - nerr nerr !

Mary Mother of Jesus ! Leaving the Twilight Zone now......


Graham

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