Question

An AM signal, depth of modulation 60% from a single tone message, has a peak-to-peak amplitude of 8 volts. What would an RMS voltmeter read if connected to this signal?

Answer 1

The RMS voltmeter would read approximately 3.4 volts.

Step-by-step explanation:

The RMS voltmeter measures the root mean square value of an alternating current (AC) signal. To find the RMS value, we need to consider the depth of modulation. In this case, the depth of modulation is 60%, which means the peak amplitude of the modulating signal is 60% of the carrier signal.

Given the peak-to-peak amplitude of the signal is 8 volts, the peak amplitude of the modulating signal is 60% of 8 volts, which is 4.8 volts. To find the RMS value, we divide the peak amplitude by the square root of 2 (approximately 1.414). Therefore, the RMS voltmeter would read approximately 3.4 volts.