AM Set the Am to 0.8, Ac to 1.0, fe to 1 kHz, and the modulating frequency to 100 Hz. The envelope should clearly be vis

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Am Set The Am To 0 8 Ac To 1 0 Fe To 1 Khz And The Modulating Frequency To 100 Hz The Envelope Should Clearly Be Vis 1 (107.15 KiB) Viewed 17 times

AM Set the Am to 0.8, Ac to 1.0, fe to 1 kHz, and the modulating frequency to 100 Hz. The envelope should clearly be visible. Begin incrementing the modulating frequency in steps of 100 Hz up to 1 kHz. Use a sinusoidal signal as the message signal. 1) At what point do you no longer see a well-defined envelope? 2) Explain why you "lose" the envelope, and interpret your result in terms of the traditional definition of an envelope. 3) Once the envelope is lost to the eye, could the signal still be detected by (a) a rectifier detector, (b) a square-law detector, (c) a synchronous demodulator? Now set Am to 0.6, Ac to 1.0, fe to 4 kHz, and the modulating frequency to 800 Hz. Increment Am to 1.4 in steps of 0.2 and observe the resulting modulated signal, paying attention both to the envelope and carrier. 4) What happens when the amplitude of the signal (a) is equal to and (b) exceeds the amplitude of the carrier? 5) Observe closely the signal in the region where the envelope appears to reach zero and change sign. Can you determine whether it is the envelope that changed sign or the carrier phase was shifted by 180°? 6) Set Am to 2 and observe the resulting waveform. Could the signal be demodulated by synchronous detection? Explain.