1. A periodic waveform has 0.4 ms time period. What is the frequency of its thir

Question

1.    A periodic waveform has 0.4 ms time period. What is the frequency of its third harmonic?

2.    What is the total average power for a commercial AM transmitter with an unmodulated carrier power of 20 kW and 100% modulation?

3.    If an output frequency of 12 MHz is required from the PLL of the following figure, what is the appropriate value for N?

4.    A baseband signal has frequency components from DC to 6 kHz. In order to provide some guard band, the signal is sampled at a rate 25% above the theoretical minimum. The sampling rate is:

5.    Waves that travel from the source to the load are known as:

6.    The angular separation between the

Explanation / Answer

1. time period = 0.4*10^-3 s

frequency=1/T =2500Hz

third harmonic. 3*2500Hz =7500Hz

2.

Ptotal=Pcarrier(1+(m^2)/2)

m=1 for 100% modulation

Ptotal =20(1+1/2) =20*3/2 =30 Kw

3

Foutput=N*Fref   

N=12/Fref (Fref is obtained from figure which you did not upload

4

minimum sampling rate =2*6 kHz=12 kHz

now 25% above means 15 kHz

5

Waves that travel from the source to the load are known as: Incident Waves

6

The angular separation between the

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