LIC LAB MANUAL - Adder Integrator and Differentiator
Frequency Modulation
Frequency Modulation and Demodulation using Frequency modulator IC 8038 and Phase Locked Loop IC – 565.Full description
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Description : j
EXPERIMENT 9:
FREQUENCY MODULATION USING IC 8038/2206 AND DEMODULATION
Aim: To conduct an experiment to generate frequency modulated wave and to measure frequency deviation and modulation index.
Components Required: Sl.No
Components
Specification
Quantity
1
IC
8038
1
2
Dc variable power supply
3
Resistor
10k Ω.100k Ω
4-1
4
Capacitor
0.01 f
1
5
AFO
1
6
CRO
1
7
Breadboard
1
8
CRO probes
3
9
Connecting wires
1 set
1
Circuit Design: When the message signal m(t)is not applied then carrier frequency fc is given by
fc= Circuit Diagram:
Waveforms
Tabular Column: =
=
∆f= Modulation index m=
Bandwidth=2(∆f+
Theoretical carrier frequency in Hz
Message signal frequency in Hz
Practical carrier frequency in Hz
=
=
)
∆f=
Modulation Bandwidth index 2(∆f+ ) m=
Procedure: 1. Check the components /equipment's for their working condition. 2. Connections are made as shown in the circuit diagram. 3.By switching off the modulating signal m(t)note the frequency of the carrier wave at pin no 2 of IC8038 4. Apply the modulating signal with suitable amplitude to get the FM signal. 5. Note the maximum and minimum frequency of the carrier wave in FM signal. 6. Calculate the frequency deviation, modulation index and bandwidth. Result: Frequency modulation is obtained for different values of carrier and message signal.
