An AM broadcast station has a peak carrier voltage of 1.5 kV. The modulating signal frequency
is 10 kHz and the carrier frequency is 1500 kHz. The depth of modulation is 35%. Compute the
following:
The upper and lower sideband frequencies.
The peak modulating signal voltage.
The peak upper and lower sideband voltages.
The maximum value of the AM wave.
4. A spectrum analyser with an input impedance of 50 ohm is used to measure the power spectrum
of an AM signal obtained by modulating a carrier with a sine wave. The carrier power is 1 W,
and the upper and lower side frequencies have a power of 330 mW each. Determine,
the total power of the AM wave.
the peak carrier voltage.
the percentage modulation.
the peak voltage of modulating sine wave.
peak voltage of the upper and lower side bands.
5. An AM transmitter has a carrier power level of 50 kW. When it is transmitting a test tone (sine
wave), compute the following:
The total transmitted power when the modulation depth is 50%.
The power in each sideband (with a modulation depth of 50%).
The total transmitted power when the depth of modulation is 100%.
The pow4r in each sideband (with a modulation depth of 100%).
6. An envelope detector is designed such that its RC time constant is equal to the period of the
modulating signal. Assuming that AM broadcast band extends from 540 kHz to 1600 kHz, and
that the highest modulating signal allowed is 10 kHz, determine the value of C given that the
load presented to the preceding stage must be at least 10
