4CS8A COMMUNICATION LAB (Common to Computer Science and Engineering& Info. Tech)
  Units    Contents of the subjects
I
Harmonic analysis of a square wave of modulated waveform Observe the amplitude modulated waveform and measures modulation index.
Demodulation of the AM signal
II
To modulate a high frequency carrier with sinusoidal signal to obtain FM signal. Demodulation of the FM signal
III
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.
IV
To study and observe the operation of a super heterodyne receiver
V
To modulate a pulse carrier with sinusoidal signal to obtain PWM signal and demodulate it.
VI
To modulate a pulse carrier with sinusoidal signal to obtain PPM signal and demodulate it.
VII
To observe pulse amplitude modulated waveform and its demodulation.
VIII
To observe the operation of a PCM encoder and decoder. To consider reason for using digital signal x-missions of analog signals.
IX
Produce ASK signals, with and without carrier suppression. Examine the different processes required for demodulation in the two cases
X
To observe the FSK wave forms and demodulate the FSK signals based on the properties of (a) tuned circuits (b) on PI.L.
XI
To study & observe the amplitude response of automatic gain controller (AGC ).