1.
The input thermal noise voltage is
2.
v=c
3.
Signal-to-noise ratio
4.
Initial frequency fi = 73 kHz
Final frequency ff = (73 + 18) kHz = 91 kHz
Let Station 1, Station 2 and Station 3 be A, B and C respectively.
The fUSB of A = 73 kHz + fm (6 kHz) = 79 kHz
The fUSB of B = 79 kHz + fm (6 kHz) = 85 kHz
The fUSB of C = 85 kHz + fm (6 kHz) = 91 kHz
Where: fUSB is the Frequency of the Upper Side-bands, while fm is the modulating frequency at which each station is allowed to transmit.
Therefore, the frequency of the upper and lower side-bands of each station are given by:
Note: fLSB means Frequency of the Lower Side-bands.
5.
Root mean square value of the shot noise current in is given by the Schotty formula:
In=
Where:
=Dc current in Amperes
q= charge of an electron in Coulombs
= the bandwidth in Hertz
Substituting
In=
In =1.266
=1.266nA
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