y1[n] = x1[n] + x2[n - 10] ...(1)
y2 = x2[n] + x2[n - 10] ...(2)
y1[n] = x1[n] + x2[n] + x2[n - 10] + x2[n - 10] ...(3)
Now find y1[n] + y2[n]
Corresponding to x1[n] + x2[n]
It is same as equation (3) hence linear.
But in part (c) y[n] = x2[n]
? y1[n] = x21[n], y2[n] = x22[n]? y1[n] + y2[n] = x22[n]...3
But y1[n] + y2[n]
Corresponing x1[n] + x2[n] is y1[n] + y2[n] = {x1[n] + x2[n]}2
= x12[n] + x22[n] + 2x1[n] x2[n]....4
Equations (3) and (4) are not same hence not linear.
Nyquist sampling freq fs ? 2fm where fm is highest frequency component in given signal and highest fm in 3rd part
2pfmt = 300 pt
fm = 150 Hz
fs = 2 x 150 p 300 Hz
.
It has an electron gun and a helix structure. However the interaction between electron beam and RF wave is different than in TWT.
The growing RF wave travels in opposite direction to the electron beam.
The frequency of wave can be changed by changing the voltage which controls the beam velocity.
Moreover the amplitude of oscillations can be decreased continuously to zero by changing the beam current.
It features are:
1. Frequency range - 1 GHz to 1000 GHz.
2. Power output - 10 mV to 150 mW (continuous wave) 250kW (pulsed).
It is used as signal source in transmitters and instruments.
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