Why would you use Friiss's formula?
A. To provide the overall noise effect of a multistage system.
B. To break down any periodic waveform into a series of sine and/or cosine waves at multiples of the fundamental frequency.
C. To establish that different users can share bands of frequencies provided that each user was assigned exclusive use of a frequency range within that band.
D. To show how the construction of a square wave can be seen to be made up of a number of sinusoids.
A
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