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From: Cursitor Doom <cd@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: A Complex Metaphysical Conundrum
Date: Wed, 10 Apr 2024 22:50:01 +0100
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On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"john larkin" <jl@650pot.com> wrote in message 
>news:v6sd1j1sr89ntc214dku5u5e04pks5toud@4ax.com...
>> On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>>
>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>news:c6hd1jdjimga6ifo7b0kv7bqfj9750lbk3@4ax.com...
>>>> Gentlemen,
>>>>
>>>> This is an exam question that trips up even some of the best students.
>>>> See what you make of it!
>>>>
>>>> Q: Is this statement correct: 'The signal level at the modem input
>>>> increased by 2dBmV going from +3dBmV to +5dBmV.'
>>>>
>>>> Your pal, CD.
>>>
>>>Changing a signal level can be thought of as multiplying the signal by a
>>>constant.
>>
>> You can change something by adding, too.
>>
>
>I haven't looked at it in detail but a bit of playing with a search engine 
>finds the question here:
>https://broadbandlibrary.com/wise-and-mighty-decibel/ 
>

Jeez, when I said, "No Googling" I didn't seriously think anyone here
would be dumb enough to need to actually do so! :-D
From the site you pointed to:
"This kind of statement is incorrect, because signal levels cannot
increase or decrease in increments of dBmV, only dB."
Well you learn something new every day on the net, doncha? ;->