A Complex Metaphysical Conundrum

[Cursitor Doom]

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.

[Cursitor Doom]

Post by Cursitor Doom
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.

I can just imagine you all furiously Googling for the answer right
now...

:-D

[john larkin]

Post by Cursitor Doom
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.

5-3=2. dBs, pineapples, whatever.

[Cursitor Doom]

Post by john larkin

Post by Cursitor Doom
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.

5-3=2. dBs, pineapples, whatever.

Very brave, John! I think the lack of response thus far indicates how
terrified the great and the good here are of getting it wrong, 'cos
those at the top have the farthest to fall in terms of reputation.
I'll provide the answer the same time tomorrow and we'll see if
there's any other brave souls out there. ;-)

[john larkin]

Post by Cursitor Doom

Post by john larkin

Post by Cursitor Doom
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.

5-3=2. dBs, pineapples, whatever.

Very brave, John! I think the lack of response thus far indicates how
terrified the great and the good here are of getting it wrong, 'cos
those at the top have the farthest to fall in terms of reputation.
I'll provide the answer the same time tomorrow and we'll see if
there's any other brave souls out there. ;-)

If I have a meter that shows dBmV, and it says 3 and I crank up the
input so it says 5, it went up by 2.

Do you have a counter-case? 3+2 equals something that's not 5?

[Cursitor Doom]

Post by john larkin

Post by Cursitor Doom

Post by john larkin

Post by Cursitor Doom
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.

5-3=2. dBs, pineapples, whatever.

Very brave, John! I think the lack of response thus far indicates how
terrified the great and the good here are of getting it wrong, 'cos
those at the top have the farthest to fall in terms of reputation.
I'll provide the answer the same time tomorrow and we'll see if
there's any other brave souls out there. ;-)

If I have a meter that shows dBmV, and it says 3 and I crank up the
input so it says 5, it went up by 2.
Do you have a counter-case? 3+2 equals something that's not 5?

I'm sure I could find someone teaching mathematics like that in our
wonderful modern school system in no time at all LOL.

[Edward Rawde]

Post by Cursitor Doom

Post by john larkin

Post by Cursitor Doom

Post by john larkin

Post by Cursitor Doom
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.

5-3=2. dBs, pineapples, whatever.

Very brave, John! I think the lack of response thus far indicates how
terrified the great and the good here are of getting it wrong, 'cos
those at the top have the farthest to fall in terms of reputation.
I'll provide the answer the same time tomorrow and we'll see if
there's any other brave souls out there. ;-)

If I have a meter that shows dBmV, and it says 3 and I crank up the
input so it says 5, it went up by 2.
Do you have a counter-case? 3+2 equals something that's not 5?

I'm sure I could find someone teaching mathematics like that in our
wonderful modern school system in no time at all LOL.

If + is a boolean Or operator then perhaps 3 + 2 = 3

[Edward Rawde]

Post by Cursitor Doom
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.
That constant can't have units because then you'd have (dBmV)^2

So that answer is likely to be that the increase is by 2 dB not 2 dBmV

[john larkin]

On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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.

[Edward Rawde]

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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/

[john larkin]

On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
https://broadbandlibrary.com/wise-and-mighty-decibel/

It says that a signal level can never go from 3 dBmV to 5 dBmV. I
think it can.

This is a silly word game.

[Edward Rawde]

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
https://broadbandlibrary.com/wise-and-mighty-decibel/

It says that a signal level can never go from 3 dBmV to 5 dBmV. I
think it can.
This is a silly word game.

How about this for an exam question.

Give an example of the construction of a 6dB power splitter, for use in a 50
ohm system, using only resistors.
Assume that the resistors do not have any frequency dependent characteristcs
at any frequency of use.
There is no need to calculate any resistor values.

What happens to the other half of the power going into the 6 dB splitter
when it is delivering one quarter of the input power through each output?

Why is it not possible to make a 3 dB power splitter using only resistors?

Or this.

Draw an op amp with the + input grounded using two 1K ohm resistors in an
inverting conviguration.
The op amp is shown with +12V and -12V power rails.
Connect the input of this circuit to the centre of two 2K ohm resistors as a
potential divider between +12V and 0V (ground)
Ask what will be on the op amp's output when measured with a high impedance
voltmeter.




.

[Cursitor Doom]

On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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? ;->

[Edward Rawde]

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.

[Cursitor Doom]

On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.

[Edward Rawde]

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.

You can also multiply it by 5/3 to get the same effect if you want. I don't
mind.

[Cursitor Doom]

On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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. ;-)

Post by Edward Rawde
You can also multiply it by 5/3 to get the same effect if you want. I don't
mind.

[a***@spenarnc.xs4all.nl]

Post by Cursitor Doom
On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.
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. ;-)

Post by Edward Rawde
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

[Edward Rawde]

Post by Cursitor Doom
On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.
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?

Post by Cursitor Doom
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. ;-)

Post by Edward Rawde
You can also multiply it by 5/3 to get the same effect if you want. I don't
mind.

[Cursitor Doom]

On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.
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.

[Edward Rawde]

Post by Cursitor Doom
On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.
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?

[Cursitor Doom]

On Thu, 11 Apr 2024 14:02:56 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.
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.

[Bill Sloman]

Post by Cursitor Doom
On Thu, 11 Apr 2024 14:02:56 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Thu, 11 Apr 2024 11:58:02 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 21:10:59 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Wed, 10 Apr 2024 18:18:21 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 16:11:39 -0400, "Edward Rawde"

Post by Edward Rawde

Post by john larkin
On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
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
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.
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.

[Jeroen Belleman]

Post by Cursitor Doom
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

[Cursitor Doom]

On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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.

[Jeroen Belleman]

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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.

Jeroen Belleman

[Cursitor Doom]

On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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.

[Jeroen Belleman]

Post by Cursitor Doom
On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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.
Granted, dBs weren't invented for making that easy.

Jeroen Belleman

[Clive Arthur]

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

<snip>

Post by Jeroen Belleman
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.

[Jeroen Belleman]

Post by Clive Arthur
<snip>

Post by Jeroen Belleman
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

[John Larkin]

On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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.

[Cursitor Doom]

On Thu, 11 Apr 2024 08:15:07 -0700, John Larkin

Post by John Larkin
On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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.

[John Larkin]

Post by Cursitor Doom
On Thu, 11 Apr 2024 08:15:07 -0700, John Larkin

Post by John Larkin
On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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?

[Edward Rawde]

Post by John Larkin

Post by Cursitor Doom
On Thu, 11 Apr 2024 08:15:07 -0700, John Larkin

Post by John Larkin
On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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 :)

[Jeroen Belleman]

Post by John Larkin
On Thu, 11 Apr 2024 16:16:20 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Thu, 11 Apr 2024 09:50:14 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
On Wed, 10 Apr 2024 23:11:53 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Cursitor Doom
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

[Jasen Betts]

Post by Cursitor Doom
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.

[Cursitor Doom]

On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts

Post by Jasen Betts

Post by Cursitor Doom
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....?

[Jasen Betts]

Post by Cursitor Doom
On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts

Post by Jasen Betts

Post by Cursitor Doom
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"

[Jeroen Belleman]

Post by Jasen Betts

Post by Cursitor Doom
On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts

Post by Jasen Betts

Post by Cursitor Doom
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

[Cursitor Doom]

On Fri, 12 Apr 2024 09:56:51 +0200, Jeroen Belleman

Post by Jeroen Belleman

Post by Jasen Betts

Post by Cursitor Doom
On Thu, 11 Apr 2024 06:38:30 -0000 (UTC), Jasen Betts

Post by Jasen Betts

Post by Cursitor Doom
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.

[Bill Sloman]

<snip>

Post by Cursitor Doom
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]

Post by Cursitor Doom
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.

It's not a complex metaphysical conundrum - it is the kind of pedantic
exam question set by the sort of lecturer who has a bee in his bonnet
about getting the units right. If you sat through his course you'd know
what his idea of what the right answer would be.

The rest of us don't have to worry because it doesn't actually matter.

[Cursitor Doom]

Post by Cursitor Doom
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:

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.

[john larkin]

Post by Cursitor Doom

Post by Cursitor Doom
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
http://youtu.be/jOVa4xJSLiA

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

Post by Cursitor Doom
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.

[Edward Rawde]

Post by Cursitor Doom

Post by Cursitor Doom
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
http://youtu.be/jOVa4xJSLiA
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.

[Cursitor Doom]

On Thu, 11 Apr 2024 14:33:45 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom

Post by Cursitor Doom
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
http://youtu.be/jOVa4xJSLiA
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.

[Edward Rawde]

Post by Cursitor Doom
On Thu, 11 Apr 2024 14:33:45 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom

Post by Cursitor Doom
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
http://youtu.be/jOVa4xJSLiA
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.

[Cursitor Doom]

On Thu, 11 Apr 2024 15:08:44 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom
On Thu, 11 Apr 2024 14:33:45 -0400, "Edward Rawde"

Post by Edward Rawde

Post by Cursitor Doom

Post by Cursitor Doom
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
http://youtu.be/jOVa4xJSLiA
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.