[Uram-rejections] Is the deciBel a misnomer?

Tue Jul 2 10:27:49 BST 2019

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 Best to leave this alone now

The post that you submitted to uk.radio.amateur.moderated has been rejected by a
moderator. 

This post contains insufficient new material. Similar points have been
made already in this discussion, which is in danger of becoming too
repetitive.

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  http://www.chiark.greenend.org.uk/uram/
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> Subject: Re: Is the deciBel a misnomer?
> From: "Jeefaw K. Effkay" <mike.gathergood at googlemail.com>
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> On Tuesday, July 2, 2019 at 8:35:30 AM UTC+1, Brian Howie wrote:
> > In message <1b2cbb4c-2037-4828-942d-40e348515ed4 at googlegroups.com>, 
> > Jeefaw K. Effkay <mike.gathergood at googlemail.com> writes
> > >On Sunday, June 30, 2019 at 2:09:00 PM UTC+1, Gareth's was W7 now W10 
> > >Downstairs Computer wrote:
> > >> The logarithmic expression of the ratio of two powers,
> > >> given as the dimensionless Bels, in honour of Alexander
> > >> Graham Bell, is defined as ...
> > >>
> > >> log10(P1/P2)
> > >>
> > >> ... so if P1 is twice whatever is P2 this gives (approx) ...
> > >>
> > >> 0.3 Bel.
> > >>
> > >> Now, for some reason, despite being au fait with the
> > >> concept of logarithms, early workers seemed ill at
> > >> ease with decimal fractions and so defined the
> > >> deciBel as ...
> > >>
> > >> 10 * log10(P1/P2)
> > >>
> > >> so the the double ratio gives (approx) ...
> > >>
> > >> 3 dB.
> > >>
> > >> But this is 10 times the reading given in Bels, so
> > >> is the term deciBel a misnomer when it should be ...
> > >>
> > >> dekaBel (Yanks)  or decaBel (rest of world)?
> > >
> > >No!
> > >0.3 Bel would be 0.03 dekaBel
> > >3 dB (deciBel) is correct.
> > >
> > >See https://en.wikipedia.org/wiki/Metric_prefix
> > 
> > I think this thread has reached its conclusion .
> 
> I don't think I can amplify on what I said, so there's nothing to be gained by continuing the thread. To do so would merely attenuate the NG's credibility, which would be a loss for all.
> 
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