On 11/04/2024 15:16, Jeroen Belleman wrote:

<snip>

> If you really want to open a can of worms, consider what might
> happen when you *add* a 2dBmV and a 3dBmV signal together.
> Granted, dBs weren't invented for making that easy.
>
> Jeroen Belleman

Assuming in-phase, that's 8.535dBmV. Wrong tool for the job.

--
Cheers
Clive

On 4/11/24 16:45, Clive Arthur wrote:
> On 11/04/2024 15:16, Jeroen Belleman wrote:
>
> <snip>
>
>> If you really want to open a can of worms, consider what might
>> happen when you *add* a 2dBmV and a 3dBmV signal together.
>> Granted, dBs weren't invented for making that easy.
>>
>> Jeroen Belleman
>
> Assuming in-phase, that's 8.535dBmV.  Wrong tool for the job.
>

Yes, that's one way of doing it. There are more.

Jeroen Belleman

On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman
<jeroen@nospam.please> wrote:

>On 4/11/24 14:58, Cursitor Doom wrote:
>> On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman
>> <jeroen@nospam.please> wrote:
>>
>>> On 4/10/24 23:42, Cursitor Doom wrote:
>>>> On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman
>>>> <jeroen@nospam.please> wrote:
>>>>
>>>>> On 4/10/24 19:02, Cursitor Doom wrote:
>>>>>> 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.
>>>>>
>>>>> Haven't we had a discussion about this already some four years ago?
>>>>> Weren't you Don Kuenz then?
>>>>>
>>>>> Jeroen Belleman
>>>>
>>>> I don't recall any such discussion and no, I'm not Don Kuenz either.
>>>
>>> Allright then. The statement is wrong. An increase is in dB, not
>>> in dBmV.
>>>
>>
>> Nice, unequivocal answer there, Jeroen; many thanks.
>
>If you really want to open a can of worms, consider what might
>happen when you *add* a 2dBmV and a 3dBmV signal together.

The sum could be 1 dBmV.

On Thu, 11 Apr 2024 08:15:07 -0700, John Larkin
<jjSNIPlarkin@highNONOlandtechnology.com> wrote:

>On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman
><jeroen@nospam.please> wrote:
>
>>On 4/11/24 14:58, Cursitor Doom wrote:
>>> On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman
>>> <jeroen@nospam.please> wrote:
>>>
>>>> On 4/10/24 23:42, Cursitor Doom wrote:
>>>>> On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman
>>>>> <jeroen@nospam.please> wrote:
>>>>>
>>>>>> On 4/10/24 19:02, Cursitor Doom wrote:
>>>>>>> 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.
>>>>>>
>>>>>> Haven't we had a discussion about this already some four years ago?
>>>>>> Weren't you Don Kuenz then?
>>>>>>
>>>>>> Jeroen Belleman
>>>>>
>>>>> I don't recall any such discussion and no, I'm not Don Kuenz either.
>>>>
>>>> Allright then. The statement is wrong. An increase is in dB, not
>>>> in dBmV.
>>>>
>>>
>>> Nice, unequivocal answer there, Jeroen; many thanks.
>>
>>If you really want to open a can of worms, consider what might
>>happen when you *add* a 2dBmV and a 3dBmV signal together.
>
>The sum could be 1 dBmV.

If out of phase, or

If taught by the Nu Mathematics.

In article <76nf1j9j04rknbh5kgta74nteeeht3303n@4ax.com>,
Cursitor Doom <cd@notformail.com> wrote:
>On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"
><invalid@invalid.invalid> wrote:
>
>>
>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>news:cs4e1j5ohhb7fpcmnft14ad6pv66jtvi34@4ax.com...
>>> On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"
>>> <invalid@invalid.invalid> wrote:
>>>
>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>news:i52e1j9ctjqi1k1m9ej1aid2493foetnsq@4ax.com...
>>>>> 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
>>>>
>>>>I don't see any mention of any search engine in your first post.
>>>>
>>>>I tend to agree with John Larkin on this.
>>>>
>>>>If a student can use a meter to see that a signal which was 3 somethings
>>>>is
>>>>now 5 somethings (depending on what is being measured) then I give them a
>>>>pass.
>>>
>>> So going back to the orginal question as stated, you're saying the
>>> statement in quotes is *correct* then. Nice to have a straight answer.
>>
>>If you mean that do I think that something increases by 2 when it goes from
>>3 to 5 then yes that seems reasonable to me.
>
>I'm afraid that's not exactly the question, though.
>Here's what was asked again:
>
>Q: Is this statement correct: 'The signal level at the modem input
>increased by 2dBmV going from +3dBmV to +5dBmV.'
>
>You've already nailed your colours to the mast with your opinion that
>the statement is correct. Are you happy with that or would you like to
>change your mind?
>
>I'll be posting 'the answer' in about 5 hours' time for those who have
>yet to stick their heads above the parapet and might be tempted to
>participate. It's been a bit deafeningly quiet so far. ;-)
>
>>
>>You can also multiply it by 5/3 to get the same effect if you want. I don't
>>mind.
>>

It is a logarithmic scale. Increasing by 2dBmV is correctly interpreted
as multiplication.

Groetjes Albert
--
Don't praise the day before the evening. One swallow doesn't make spring.
You must not say "hey" before you have crossed the bridge. Don't sell the
hide of the bear until you shot it. Better one bird in the hand than ten in
the air. First gain is a cat purring. - the Wise from Antrim -

On Thu, 11 Apr 2024 16:20:28 +0100, Cursitor Doom <cd@notformail.com>
wrote:

>On Thu, 11 Apr 2024 08:15:07 -0700, John Larkin
><jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>
>>On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman
>><jeroen@nospam.please> wrote:
>>
>>>On 4/11/24 14:58, Cursitor Doom wrote:
>>>> On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman
>>>> <jeroen@nospam.please> wrote:
>>>>
>>>>> On 4/10/24 23:42, Cursitor Doom wrote:
>>>>>> On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman
>>>>>> <jeroen@nospam.please> wrote:
>>>>>>
>>>>>>> On 4/10/24 19:02, Cursitor Doom wrote:
>>>>>>>> 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.
>>>>>>>
>>>>>>> Haven't we had a discussion about this already some four years ago?
>>>>>>> Weren't you Don Kuenz then?
>>>>>>>
>>>>>>> Jeroen Belleman
>>>>>>
>>>>>> I don't recall any such discussion and no, I'm not Don Kuenz either.
>>>>>
>>>>> Allright then. The statement is wrong. An increase is in dB, not
>>>>> in dBmV.
>>>>>
>>>>
>>>> Nice, unequivocal answer there, Jeroen; many thanks.
>>>
>>>If you really want to open a can of worms, consider what might
>>>happen when you *add* a 2dBmV and a 3dBmV signal together.
>>
>>The sum could be 1 dBmV.
>
>If out of phase, or
>
>If taught by the Nu Mathematics.

What is -2 volts in dBmV?

On 4/11/24 17:15, John Larkin wrote:
> On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman
> <jeroen@nospam.please> wrote:
>
>> On 4/11/24 14:58, Cursitor Doom wrote:
>>> On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman
>>> <jeroen@nospam.please> wrote:
>>>
>>>> On 4/10/24 23:42, Cursitor Doom wrote:
>>>>> On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman
>>>>> <jeroen@nospam.please> wrote:
>>>>>
>>>>>> On 4/10/24 19:02, Cursitor Doom wrote:
>>>>>>> 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.
>>>>>>
>>>>>> Haven't we had a discussion about this already some four years ago?
>>>>>> Weren't you Don Kuenz then?
>>>>>>
>>>>>> Jeroen Belleman
>>>>>
>>>>> I don't recall any such discussion and no, I'm not Don Kuenz either.
>>>>
>>>> Allright then. The statement is wrong. An increase is in dB, not
>>>> in dBmV.
>>>>
>>>
>>> Nice, unequivocal answer there, Jeroen; many thanks.
>>
>> If you really want to open a can of worms, consider what might
>> happen when you *add* a 2dBmV and a 3dBmV signal together.
>
> The sum could be 1 dBmV.
>

It could...

Jeroen Belleman

"Cursitor Doom" <cd@notformail.com> wrote in message
news:76nf1j9j04rknbh5kgta74nteeeht3303n@4ax.com...
> On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>
>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>news:cs4e1j5ohhb7fpcmnft14ad6pv66jtvi34@4ax.com...
>>> On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"
>>> <invalid@invalid.invalid> wrote:
>>>
>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>news:i52e1j9ctjqi1k1m9ej1aid2493foetnsq@4ax.com...
>>>>> 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
>>>>
>>>>I don't see any mention of any search engine in your first post.
>>>>
>>>>I tend to agree with John Larkin on this.
>>>>
>>>>If a student can use a meter to see that a signal which was 3 somethings
>>>>is
>>>>now 5 somethings (depending on what is being measured) then I give them
>>>>a
>>>>pass.
>>>
>>> So going back to the orginal question as stated, you're saying the
>>> statement in quotes is *correct* then. Nice to have a straight answer.
>>
>>If you mean that do I think that something increases by 2 when it goes
>>from
>>3 to 5 then yes that seems reasonable to me.
>
> I'm afraid that's not exactly the question, though.
> Here's what was asked again:
>
> Q: Is this statement correct: 'The signal level at the modem input
> increased by 2dBmV going from +3dBmV to +5dBmV.'
>
> You've already nailed your colours to the mast with your opinion that
> the statement is correct. Are you happy with that or would you like to
> change your mind?

What's wrong with the mind I already have?

My opinion is in my first reply to you.

Do the students who take this exam do any practical work or just sit in
class?

>
> I'll be posting 'the answer' in about 5 hours' time for those who have
> yet to stick their heads above the parapet and might be tempted to
> participate. It's been a bit deafeningly quiet so far. ;-)
>
>>
>>You can also multiply it by 5/3 to get the same effect if you want. I
>>don't
>>mind.
>>

"John Larkin" <jjSNIPlarkin@highNONOlandtechnology.com> wrote in message
news:sr0g1jd1bc8m0p73528k2rsro5hi0v7is3@4ax.com...
> On Thu, 11 Apr 2024 16:20:28 +0100, Cursitor Doom <cd@notformail.com>
> wrote:
>
>>On Thu, 11 Apr 2024 08:15:07 -0700, John Larkin
>><jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>>
>>>On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman
>>><jeroen@nospam.please> wrote:
>>>
>>>>On 4/11/24 14:58, Cursitor Doom wrote:
>>>>> On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman
>>>>> <jeroen@nospam.please> wrote:
>>>>>
>>>>>> On 4/10/24 23:42, Cursitor Doom wrote:
>>>>>>> On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman
>>>>>>> <jeroen@nospam.please> wrote:
>>>>>>>
>>>>>>>> On 4/10/24 19:02, Cursitor Doom wrote:
>>>>>>>>> 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.
>>>>>>>>
>>>>>>>> Haven't we had a discussion about this already some four years ago?
>>>>>>>> Weren't you Don Kuenz then?
>>>>>>>>
>>>>>>>> Jeroen Belleman
>>>>>>>
>>>>>>> I don't recall any such discussion and no, I'm not Don Kuenz either.
>>>>>>
>>>>>> Allright then. The statement is wrong. An increase is in dB, not
>>>>>> in dBmV.
>>>>>>
>>>>>
>>>>> Nice, unequivocal answer there, Jeroen; many thanks.
>>>>
>>>>If you really want to open a can of worms, consider what might
>>>>happen when you *add* a 2dBmV and a 3dBmV signal together.
>>>
>>>The sum could be 1 dBmV.
>>
>>If out of phase, or
>>
>>If taught by the Nu Mathematics.
>
> What is -2 volts in dBmV?
>

Probably unhandled exception in log function or something like that :)

On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"Cursitor Doom" <cd@notformail.com> wrote in message
>news:76nf1j9j04rknbh5kgta74nteeeht3303n@4ax.com...
>> On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>>
>>>
>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>news:cs4e1j5ohhb7fpcmnft14ad6pv66jtvi34@4ax.com...
>>>> On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"
>>>> <invalid@invalid.invalid> wrote:
>>>>
>>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>>news:i52e1j9ctjqi1k1m9ej1aid2493foetnsq@4ax.com...
>>>>>> 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
>>>>>
>>>>>I don't see any mention of any search engine in your first post.
>>>>>
>>>>>I tend to agree with John Larkin on this.
>>>>>
>>>>>If a student can use a meter to see that a signal which was 3 somethings
>>>>>is
>>>>>now 5 somethings (depending on what is being measured) then I give them
>>>>>a
>>>>>pass.
>>>>
>>>> So going back to the orginal question as stated, you're saying the
>>>> statement in quotes is *correct* then. Nice to have a straight answer.
>>>
>>>If you mean that do I think that something increases by 2 when it goes
>>>from
>>>3 to 5 then yes that seems reasonable to me.
>>
>> I'm afraid that's not exactly the question, though.
>> Here's what was asked again:
>>
>> Q: Is this statement correct: 'The signal level at the modem input
>> increased by 2dBmV going from +3dBmV to +5dBmV.'
>>
>> You've already nailed your colours to the mast with your opinion that
>> the statement is correct. Are you happy with that or would you like to
>> change your mind?
>
>What's wrong with the mind I already have?
>
>My opinion is in my first reply to you.
>
>Do the students who take this exam do any practical work or just sit in
>class?

They're students so of course they don't do anything useful.

On Wed, 10 Apr 2024 18:02:50 +0100, Cursitor Doom <cd@notformail.com>
wrote:

>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.

Okay, here's the answer you've been waiting for from some guy on the
internet in this record-low participation quiz. This URL takes you
directly to the relevant section to save time:

https://youtu.be/jOVa4xJSLiA?list=PLl-kpmJ-_T4DMeDalokqXz7u-ReHZi08p&t=1466

So it turns out that John, Edward and myself were all wrong and only
Jason and Jeroen were right! And the proof is right there in the
video.

"Cursitor Doom" <cd@notformail.com> wrote in message
news:pk8g1j9u6joiofssfcg9g9qed1lcikluta@4ax.com...
> On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>news:76nf1j9j04rknbh5kgta74nteeeht3303n@4ax.com...
>>> On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"
>>> <invalid@invalid.invalid> wrote:
>>>
>>>>
>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>news:cs4e1j5ohhb7fpcmnft14ad6pv66jtvi34@4ax.com...
>>>>> On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"
>>>>> <invalid@invalid.invalid> wrote:
>>>>>
>>>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>>>news:i52e1j9ctjqi1k1m9ej1aid2493foetnsq@4ax.com...
>>>>>>> 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
>>>>>>
>>>>>>I don't see any mention of any search engine in your first post.
>>>>>>
>>>>>>I tend to agree with John Larkin on this.
>>>>>>
>>>>>>If a student can use a meter to see that a signal which was 3
>>>>>>somethings
>>>>>>is
>>>>>>now 5 somethings (depending on what is being measured) then I give
>>>>>>them
>>>>>>a
>>>>>>pass.
>>>>>
>>>>> So going back to the orginal question as stated, you're saying the
>>>>> statement in quotes is *correct* then. Nice to have a straight answer.
>>>>
>>>>If you mean that do I think that something increases by 2 when it goes
>>>>from
>>>>3 to 5 then yes that seems reasonable to me.
>>>
>>> I'm afraid that's not exactly the question, though.
>>> Here's what was asked again:
>>>
>>> Q: Is this statement correct: 'The signal level at the modem input
>>> increased by 2dBmV going from +3dBmV to +5dBmV.'
>>>
>>> You've already nailed your colours to the mast with your opinion that
>>> the statement is correct. Are you happy with that or would you like to
>>> change your mind?
>>
>>What's wrong with the mind I already have?
>>
>>My opinion is in my first reply to you.
>>
>>Do the students who take this exam do any practical work or just sit in
>>class?
>
> They're students so of course they don't do anything useful.

Is that because you don't teach them how to do anything useful or because
they don't want to be taught how do anything useful?

On Thu, 11 Apr 2024 18:55:30 +0100, Cursitor Doom <cd@notformail.com>
wrote:

>On Wed, 10 Apr 2024 18:02:50 +0100, Cursitor Doom <cd@notformail.com>
>wrote:
>
>>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.
>
>Okay, here's the answer you've been waiting for from some guy on the
>internet in this record-low participation quiz. This URL takes you
>directly to the relevant section to save time:
>
>https://youtu.be/jOVa4xJSLiA?list=PLl-kpmJ-_T4DMeDalokqXz7u-ReHZi08p&t=1466

Silly nonsense. RF people tend to do that. By his reasoning, the
actual question is wrong and the increase is impossible.

>
>So it turns out that John, Edward and myself were all wrong and only
>Jason and Jeroen were right! And the proof is right there in the
>video.
>

The question is fuzzy, basicly designed to generate chatter.

I still believe that 3+2=5.

"Cursitor Doom" <cd@notformail.com> wrote in message
news:ar1g1jdn81s994gd5brslvrrlns8jrtq13@4ax.com...
> On Wed, 10 Apr 2024 18:02:50 +0100, Cursitor Doom <cd@notformail.com>
> wrote:
>
>>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.
>
> Okay, here's the answer you've been waiting for from some guy on the
> internet in this record-low participation quiz. This URL takes you
> directly to the relevant section to save time:
>
> https://youtu.be/jOVa4xJSLiA?list=PLl-kpmJ-_T4DMeDalokqXz7u-ReHZi08p&t=1466
>
> So it turns out that John, Edward and myself were all wrong and only
> Jason and Jeroen were right! And the proof is right there in the
> video.
>
>

I don't see any proof of anything in the section of the video you posted.
I didn't watch the entire video.
Maybe you should post the proof for this example in text and ask why a 30
minute video is needed if a few lines of text is enough.
DOCSIS isn't my field but I would have thought that the average cable modem
could report whether or not it's happy with the signal levels.
The ISP/Cable company I use ripped the cable and phone lines out and put
fibre to the home into the small town I live in about a year ago.
So DOCSIS is history here.

On Thu, 11 Apr 2024 14:02:56 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"Cursitor Doom" <cd@notformail.com> wrote in message
>news:pk8g1j9u6joiofssfcg9g9qed1lcikluta@4ax.com...
>> On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>>
>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>news:76nf1j9j04rknbh5kgta74nteeeht3303n@4ax.com...
>>>> On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"
>>>> <invalid@invalid.invalid> wrote:
>>>>
>>>>>
>>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>>news:cs4e1j5ohhb7fpcmnft14ad6pv66jtvi34@4ax.com...
>>>>>> On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"
>>>>>> <invalid@invalid.invalid> wrote:
>>>>>>
>>>>>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>>>>>news:i52e1j9ctjqi1k1m9ej1aid2493foetnsq@4ax.com...
>>>>>>>> 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
>>>>>>>
>>>>>>>I don't see any mention of any search engine in your first post.
>>>>>>>
>>>>>>>I tend to agree with John Larkin on this.
>>>>>>>
>>>>>>>If a student can use a meter to see that a signal which was 3
>>>>>>>somethings
>>>>>>>is
>>>>>>>now 5 somethings (depending on what is being measured) then I give
>>>>>>>them
>>>>>>>a
>>>>>>>pass.
>>>>>>
>>>>>> So going back to the orginal question as stated, you're saying the
>>>>>> statement in quotes is *correct* then. Nice to have a straight answer.
>>>>>
>>>>>If you mean that do I think that something increases by 2 when it goes
>>>>>from
>>>>>3 to 5 then yes that seems reasonable to me.
>>>>
>>>> I'm afraid that's not exactly the question, though.
>>>> Here's what was asked again:
>>>>
>>>> Q: Is this statement correct: 'The signal level at the modem input
>>>> increased by 2dBmV going from +3dBmV to +5dBmV.'
>>>>
>>>> You've already nailed your colours to the mast with your opinion that
>>>> the statement is correct. Are you happy with that or would you like to
>>>> change your mind?
>>>
>>>What's wrong with the mind I already have?
>>>
>>>My opinion is in my first reply to you.
>>>
>>>Do the students who take this exam do any practical work or just sit in
>>>class?
>>
>> They're students so of course they don't do anything useful.
>
>Is that because you don't teach them how to do anything useful or because
>they don't want to be taught how do anything useful?
>

Sorry, you're new here so you don't know who's who yet. I'm not a
professor - far from it! And these are hypothetical students.

On Thu, 11 Apr 2024 14:33:45 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"Cursitor Doom" <cd@notformail.com> wrote in message
>news:ar1g1jdn81s994gd5brslvrrlns8jrtq13@4ax.com...
>> On Wed, 10 Apr 2024 18:02:50 +0100, Cursitor Doom <cd@notformail.com>
>> wrote:
>>
>>>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.
>>
>> Okay, here's the answer you've been waiting for from some guy on the
>> internet in this record-low participation quiz. This URL takes you
>> directly to the relevant section to save time:
>>
>> https://youtu.be/jOVa4xJSLiA?list=PLl-kpmJ-_T4DMeDalokqXz7u-ReHZi08p&t=1466
>>
>> So it turns out that John, Edward and myself were all wrong and only
>> Jason and Jeroen were right! And the proof is right there in the
>> video.
>>
>>
>
>I don't see any proof of anything in the section of the video you posted.
>I didn't watch the entire video.
>Maybe you should post the proof for this example in text and ask why a 30
>minute video is needed if a few lines of text is enough.
>DOCSIS isn't my field but I would have thought that the average cable modem
>could report whether or not it's happy with the signal levels.
>The ISP/Cable company I use ripped the cable and phone lines out and put
>fibre to the home into the small town I live in about a year ago.
>So DOCSIS is history here.
>

Sorry, sarcasm doesn't come across very well at all via this medium!
John knows what I mean as we're both veterans here. I actually agree
with you. The question itself is just plain stupid if the answer
suggests that two absolute quantities added together cannot make an
absolute total.

"Cursitor Doom" <cd@notformail.com> wrote in message
news:qjbg1jh7baj22i618rcafvo80rcgcm7ojn@4ax.com...
> On Thu, 11 Apr 2024 14:33:45 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>news:ar1g1jdn81s994gd5brslvrrlns8jrtq13@4ax.com...
>>> On Wed, 10 Apr 2024 18:02:50 +0100, Cursitor Doom <cd@notformail.com>
>>> wrote:
>>>
>>>>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.
>>>
>>> Okay, here's the answer you've been waiting for from some guy on the
>>> internet in this record-low participation quiz. This URL takes you
>>> directly to the relevant section to save time:
>>>
>>> https://youtu.be/jOVa4xJSLiA?list=PLl-kpmJ-_T4DMeDalokqXz7u-ReHZi08p&t=1466
>>>
>>> So it turns out that John, Edward and myself were all wrong and only
>>> Jason and Jeroen were right! And the proof is right there in the
>>> video.
>>>
>>>
>>
>>I don't see any proof of anything in the section of the video you posted.
>>I didn't watch the entire video.
>>Maybe you should post the proof for this example in text and ask why a 30
>>minute video is needed if a few lines of text is enough.
>>DOCSIS isn't my field but I would have thought that the average cable
>>modem
>>could report whether or not it's happy with the signal levels.
>>The ISP/Cable company I use ripped the cable and phone lines out and put
>>fibre to the home into the small town I live in about a year ago.
>>So DOCSIS is history here.
>>
>
> Sorry, sarcasm doesn't come across very well at all via this medium!
> John knows what I mean as we're both veterans here. I actually agree
> with you. The question itself is just plain stupid if the answer
> suggests that two absolute quantities added together cannot make an
> absolute total.

Pompous twit might be going a bit far but that's what came to mind while I
watched a few minutes of the video.
The guy with the headphones seems embarrassed.

I did manage to find this
https://www.scte.org/standards/library/catalog/scte-270-mathematics-of-cable/
I'll add it to my collection of pdfs I've had a quick look through but never
read.

On Thu, 11 Apr 2024 15:08:44 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"Cursitor Doom" <cd@notformail.com> wrote in message
>news:qjbg1jh7baj22i618rcafvo80rcgcm7ojn@4ax.com...
>> On Thu, 11 Apr 2024 14:33:45 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>>
>>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>>news:ar1g1jdn81s994gd5brslvrrlns8jrtq13@4ax.com...
>>>> On Wed, 10 Apr 2024 18:02:50 +0100, Cursitor Doom <cd@notformail.com>
>>>> wrote:
>>>>
>>>>>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.
>>>>
>>>> Okay, here's the answer you've been waiting for from some guy on the
>>>> internet in this record-low participation quiz. This URL takes you
>>>> directly to the relevant section to save time:
>>>>
>>>> https://youtu.be/jOVa4xJSLiA?list=PLl-kpmJ-_T4DMeDalokqXz7u-ReHZi08p&t=1466
>>>>
>>>> So it turns out that John, Edward and myself were all wrong and only
>>>> Jason and Jeroen were right! And the proof is right there in the
>>>> video.
>>>>
>>>>
>>>
>>>I don't see any proof of anything in the section of the video you posted.
>>>I didn't watch the entire video.
>>>Maybe you should post the proof for this example in text and ask why a 30
>>>minute video is needed if a few lines of text is enough.
>>>DOCSIS isn't my field but I would have thought that the average cable
>>>modem
>>>could report whether or not it's happy with the signal levels.
>>>The ISP/Cable company I use ripped the cable and phone lines out and put
>>>fibre to the home into the small town I live in about a year ago.
>>>So DOCSIS is history here.
>>>
>>
>> Sorry, sarcasm doesn't come across very well at all via this medium!
>> John knows what I mean as we're both veterans here. I actually agree
>> with you. The question itself is just plain stupid if the answer
>> suggests that two absolute quantities added together cannot make an
>> absolute total.
>
>Pompous twit might be going a bit far but that's what came to mind while I
>watched a few minutes of the video.
>The guy with the headphones seems embarrassed.
>
>I did manage to find this
>https://www.scte.org/standards/library/catalog/scte-270-mathematics-of-cable/
>I'll add it to my collection of pdfs I've had a quick look through but never
>read.
>

The guy with the phones introduces him as a 50 year veteran of the
cable industry but doesn't set out his precise qualifications, so
perhaps he has none!
Thanks for the link. I save all such documents for off-line reading on
plane flights and such like.

On 12/04/2024 4:38 am, Cursitor Doom wrote:
> On Thu, 11 Apr 2024 14:02:56 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>> "Cursitor Doom" <cd@notformail.com> wrote in message
>> news:pk8g1j9u6joiofssfcg9g9qed1lcikluta@4ax.com...
>>> On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"
>>> <invalid@invalid.invalid> wrote:
>>>
>>>> "Cursitor Doom" <cd@notformail.com> wrote in message
>>>> news:76nf1j9j04rknbh5kgta74nteeeht3303n@4ax.com...
>>>>> On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"
>>>>> <invalid@invalid.invalid> wrote:
>>>>>
>>>>>>
>>>>>> "Cursitor Doom" <cd@notformail.com> wrote in message
>>>>>> news:cs4e1j5ohhb7fpcmnft14ad6pv66jtvi34@4ax.com...
>>>>>>> On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"
>>>>>>> <invalid@invalid.invalid> wrote:
>>>>>>>
>>>>>>>> "Cursitor Doom" <cd@notformail.com> wrote in message
>>>>>>>> news:i52e1j9ctjqi1k1m9ej1aid2493foetnsq@4ax.com...
>>>>>>>>> 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
>>>>>>>>
>>>>>>>> I don't see any mention of any search engine in your first post.
>>>>>>>>
>>>>>>>> I tend to agree with John Larkin on this.
>>>>>>>>
>>>>>>>> If a student can use a meter to see that a signal which was 3
>>>>>>>> somethings
>>>>>>>> is
>>>>>>>> now 5 somethings (depending on what is being measured) then I give
>>>>>>>> them
>>>>>>>> a
>>>>>>>> pass.
>>>>>>>
>>>>>>> So going back to the orginal question as stated, you're saying the
>>>>>>> statement in quotes is *correct* then. Nice to have a straight answer.
>>>>>>
>>>>>> If you mean that do I think that something increases by 2 when it goes
>>>>>> from
>>>>>> 3 to 5 then yes that seems reasonable to me.
>>>>>
>>>>> I'm afraid that's not exactly the question, though.
>>>>> Here's what was asked again:
>>>>>
>>>>> Q: Is this statement correct: 'The signal level at the modem input
>>>>> increased by 2dBmV going from +3dBmV to +5dBmV.'
>>>>>
>>>>> You've already nailed your colours to the mast with your opinion that
>>>>> the statement is correct. Are you happy with that or would you like to
>>>>> change your mind?
>>>>
>>>> What's wrong with the mind I already have?
>>>>
>>>> My opinion is in my first reply to you.
>>>>
>>>> Do the students who take this exam do any practical work or just sit in
>>>> class?
>>>
>>> They're students so of course they don't do anything useful.
>>
>> Is that because you don't teach them how to do anything useful or because
>> they don't want to be taught how do anything useful?
>>
>
> Sorry, you're new here so you don't know who's who yet. I'm not a
> professor - far from it! And these are hypothetical students.

This leaves out Cursitor Doom's unique selling point, which is a
devotion to particularly fatuous conspiracy theories.

His take on anthropogenic global warming is spectacularly perverse -
he's happy to ignore the modern - accurate - data on atmospheric CO2
levels which started being collected in 1958, on the basis that it was
part of a long-standing conspiracy to frighten the public into
supporting lots of academic climate scientists.

This rather ignores the fact that actual anthropogenic global warming
didn't become statistically significant until the late 1980's so the
conspiracy would have taken a long time to pay off.

--
Bill Sloman, Sydney

On 2024-04-11, Cursitor Doom <cd@notformail.com> wrote:
> On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts
><usenet@revmaps.no-ip.org> wrote:
>
>>On 2024-04-10, Cursitor Doom <cd@notformail.com> wrote:
>>> 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.
>>
>>db is a logarythmic ratio. an increase from +3dBmV to +5dBmV is an increase by 2dB
>>(not 2dBmV)
>>
>>Adding 2dBmV to +3dBmV will not get you +5dBmV because it's a
>>logarythmic scale.
>
> The question does require a "correct/incorrect" answer. It's a binary
> choice. Your answer is....?

My answer is still "db is a logarythmic ratio. an increase from +3dBmV to +5dBmV is
an increase by 2dB"

--
Jasen.
🇺🇦 Слава Україні

On 4/12/24 08:15, Jasen Betts wrote:
> On 2024-04-11, Cursitor Doom <cd@notformail.com> wrote:
>> On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts
>> <usenet@revmaps.no-ip.org> wrote:
>>
>>> On 2024-04-10, Cursitor Doom <cd@notformail.com> wrote:
>>>> 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.
>>>
>>> db is a logarythmic ratio. an increase from +3dBmV to +5dBmV is an increase by 2dB
>>> (not 2dBmV)
>>>
>>> Adding 2dBmV to +3dBmV will not get you +5dBmV because it's a
>>> logarythmic scale.
>>
>> The question does require a "correct/incorrect" answer. It's a binary
>> choice. Your answer is....?
>
> My answer is still "db is a logarythmic ratio. an increase from +3dBmV to +5dBmV is
> an increase by 2dB"
>

It's "logarithmic".

Jeroen Belleman

On Fri, 12 Apr 2024 09:56:51 +0200, Jeroen Belleman
<jeroen@nospam.please> wrote:

>On 4/12/24 08:15, Jasen Betts wrote:
>> On 2024-04-11, Cursitor Doom <cd@notformail.com> wrote:
>>> On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts
>>> <usenet@revmaps.no-ip.org> wrote:
>>>
>>>> On 2024-04-10, Cursitor Doom <cd@notformail.com> wrote:
>>>>> 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.
>>>>
>>>> db is a logarythmic ratio. an increase from +3dBmV to +5dBmV is an increase by 2dB
>>>> (not 2dBmV)
>>>>
>>>> Adding 2dBmV to +3dBmV will not get you +5dBmV because it's a
>>>> logarythmic scale.
>>>
>>> The question does require a "correct/incorrect" answer. It's a binary
>>> choice. Your answer is....?
>>
>> My answer is still "db is a logarythmic ratio. an increase from +3dBmV to +5dBmV is
>> an increase by 2dB"
>>
>
>It's "logarithmic".
>
>Jeroen Belleman

I'm sorry, but that's the *wrong* answer. The answer needs to be
either "correct" or "incorrect" according to that guy on the internet
who obviously knows what he's talking about or he wouldn't have been
speaking on the subject on Youtube.

On 13/04/2024 2:46 am, Cursitor Doom wrote:
> On Fri, 12 Apr 2024 09:56:51 +0200, Jeroen Belleman <jeroen@nospam.please> wrote:
>> On 4/12/24 08:15, Jasen Betts wrote:
>>> On 2024-04-11, Cursitor Doom <cd@notformail.com> wrote:
>>>> On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts <usenet@revmaps.no-ip.org> wrote:
>>>>> On 2024-04-10, Cursitor Doom <cd@notformail.com> wrote:

<snip>

> I'm sorry, but that's the *wrong* answer. The answer needs to be
> either "correct" or "incorrect" according to that guy on the internet
> who obviously knows what he's talking about or he wouldn't have been
> speaking on the subject on Youtube.

Youtube isn't a peer-reviewed publication. Any twit can post there.
People who think they know what they are talking about can sound quite
authoritative - Donald Trump is a prize example - and Cursitor Doom
lacks the critical thinking skills required to sort the wheat from the
chaff.

--
Bill Sloman, Sydney