An AM receiver is tuned to broadcast station at 600 kHz. Calculate the image rejection in…

  1. An AM receiver is tuned to broadcast station at 600 kHz.
    Calculate the image rejection in dB, assuming that the input filter
    consist of one tuned circuit with a Q of 40?
  2. An SSB system transmit a peak envelope power of 100 W into a 75
    ohms load. The carrier signal is modulated by two tones, with
    frequencies 2 kHz and 3 kHz with equal magnitude and only the lower
    sideband is transmitted with a suppressed carrier. Determine the
    average power into the load?
  3. In the SSB, determine the maximum suppression of the unwanted
    sideband if the deviation from a perfect 90 phase shift is 5”?
  4. An AM transmitter has an output power of 100 W at no modulation
    with efficiency of 60 %. What will be the output power with 97 %
    modulation?
  5. Given an audio power of 500 W which will modulated an RF
    amplifier to 50 % modulate an RF amplifier to 50 % modulation. Find
    the DC power input?
  6. A CB transmitter supplies a total power of 120 W to an aerial.
    Suppose the carrier is amplitude modulated to a depth of 80 %, how
    much power is wasted by the carrier signal?
  7. Determine the modulation index of the signal given the
    following parameters: Emax = 10 Vp, Em= 4 Vp.
  8. A DSB-SC system must suppress the carrier by 50 dB for its
    original value of 10 W. To what value must the carrier be
    reduced?
  9. A transistor has a power dissipation rating of 30 W. Assuming
    that the transistor is the only element that dissipates power in a
    circuit, calculate the power an amplifier, using this transistor,
    could deliver the load if it operates as Class-A wit an efficiency
    of 30 %?
  10. An AM signal supplies 150 W of carrier power when it is
    modulated by a single sine wave to a depth of 70 %. Suppose the
    total transmitted power increases by 10 % when another sine wave
    simultaneously amplitude modulates the carrier, determine the
    modulation index of the second sine wave?