4CS8A COMMUNICATION LAB
1 Harmonic analysis of a square wave of modulated waveform
Observe the amplitude modulated waveform and measures modulation index.
Demodulation of the AM signal
2 To modulate a high frequency carrier with sinusoidal signal to obtain FM signal.
Demodulation of the FM signal
3 To observe the following in a transmission line demonstrator kit :
i. The propagation of pulse in non-reflecting Transmission line.
ii. The effect of losses in Transmission line.
iii. The resonance characteristics of al half wavelength long x-mission line.
4 To study and observe the operation of a super heterodyne receiver
5 To modulate a pulse carrier with sinusoidal signal to obtain PWM signal and
demodulate it.
6 To modulate a pulse carrier with sinusoidal signal to obtain PPM signal and
demodulate it.
7 To observe pulse amplitude modulated waveform and its demodulation.
8 To observe the operation of a PCM encoder and decoder. To consider reason for
using digital signal x-missions of analog signals.
9 Produce ASK signals, with and without carrier suppression. Examine the different
processes required for demodulation in the two cases
10 To observe the FSK wave forms and demodulate the FSK signals based on the
properties of (a) tuned circuits (b) on PI.L.
11 To study & observe the amplitude response of automatic gain controller (AGC ).
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