The City College of New York, CUNY - EE 422EE 422 Lab on AM Communications

The City College of New York, CUNY - EE 422EE 422 Lab on AM Communications

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OBJECTIVE: To demonstrate an AM communications system using the AM/ DSB/ SSB Generator and the AM/ DSB Receiver. DISCUSSION: The essential parts of a communication systems as shown below, are the ... sender or transmitter, the transmission line, and the receiver. The direction of information flow is from sender to receiver. This system is unidirectional. Figure 1: Communications system. EQUIPMENT: Description Model Accessories 8948 Power Supply/ Dual Audio Amplifier 9801 Dual Function Generator 9402 Frequency Counter 9403 AM/ DSB/ SSB Generator 9410 AM/ DSB Receiver 9411 Oscilloscope - PROCEDURE: We set up the modules as shown below. All OUTPUT LEVEL and GAIN controls are turned fully counterclockwise to the MIN position. All the equipments are power up.1) Adjust the channel A controls on the Dual Function Generator as follows: FUNCTION : Sine wave FREQUENCY RANGE : 10 kHz OUTPUT FREQUENCY display : A FREQUENCY knob : Adjust for 2 kHz ATTENUATOR : 20 Db OUTPUT LEVEL knob : ¼ turn cw The low frequency signal now present at OUTPUT A will be used as the input for the AM communications system. What does it represent? [Show More]