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From: Jeroen Belleman <jeroen@nospam.please>
Newsgroups: sci.electronics.design
Subject: Re: dBs
Date: Sun, 26 May 2024 19:25:41 +0200
Organization: A noiseless patient Spider
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On 5/26/24 19:09, Cursitor Doom wrote:
> I'm feeling cognitively-declined today, probably as a consequence of my
> vast age and general ignorance of matters mathematical and everything else
> in fact, with the sole exception of "fatuous conspiracy theories." Can
> some kind soul assist?
> If my RF power meter is reading -13dbm when there's a 20dB attenuator in
> line, what is the true power level, please?
> I've got an exhaustive App Note from Rhode & Schwartz which claims to
> cover everything about decibels, but, er, doesn't.
> 
> CD.

That would be -13 + 20 = +7dBm, provided that impedances
are matched everywhere.

Jeroen Belleman