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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: dBs
Date: Sun, 26 May 2024 17:58:48 -0000 (UTC)
Organization: A noiseless patient Spider
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On Sun, 26 May 2024 19:25:41 +0200, Jeroen Belleman wrote:

> 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.

I was under the impression that one couldn't simply just add dBs to dBms?