Sujet : Re: A Complex Metaphysical Conundrum
De : invalid (at) *nospam* invalid.invalid (Edward Rawde)
Groupes : sci.electronics.designDate : 11. Apr 2024, 00:05:17
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"john larkin" <
jl@650pot.com> wrote in message
news:tgud1jh3e4s3u0nupgusk01tj0rebb4iov@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/
>
>
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.
.
A Complex Metaphysical Conundrum
Re: A Complex Metaphysical Conundrum
