In a low-level transmitter, modulation is performed:
A
After the power amplifier
B
Before the power amplifier
Analysis & Theory
In low-level transmitters, modulation is done at low power levels before amplification.
High-level modulation is performed:
A
At the output of the power amplifier
B
At the input of the modulator
Analysis & Theory
In high-level transmitters, modulation is done after the signal has been amplified.
Which of the following requires linear power amplifiers?
A
High-level transmitters
D
Both low-level and SSB transmitters
Analysis & Theory
Low-level and SSB transmitters require linear amplifiers to maintain signal fidelity during amplification.
Which transmitter type is more power-efficient for AM broadcasting?
Analysis & Theory
SSB (Single Sideband) transmitters are the most power-efficient because they suppress the carrier and one sideband.
SSB modulation transmits:
C
One sideband and the carrier
Analysis & Theory
SSB transmits only one sideband (either upper or lower) and suppresses the carrier and the other sideband.
One advantage of SSB over standard AM is:
C
Less power consumption and bandwidth
Analysis & Theory
SSB uses less power and bandwidth compared to standard AM.
Which type of transmitter typically has simpler circuitry?
Analysis & Theory
Low-level transmitters use simpler low-power circuits before final amplification.
Which transmitter uses a balanced modulator to suppress the carrier?
A
Low-level AM transmitter
D
High-level AM transmitter
Analysis & Theory
SSB transmitters use a balanced modulator to cancel out the carrier frequency.
Which transmitter type is suitable for high-power AM transmission?
Analysis & Theory
High-level transmitters are ideal for high-power applications as modulation is done after amplification.
In an SSB transmitter, what component is used to filter out one of the sidebands?
Analysis & Theory
A band-pass filter is used to select and pass only one sideband in SSB transmitters.