Question
What is an advantage of having a variety of receiver bandwidths from which to select?
Answer Options
- A) The noise figure of the RF amplifier can be adjusted to match the modulation type, thus increasing receiver sensitivity
- B) Receiver power consumption can be reduced when wider bandwidth is not required
- C) Receive bandwidth can be set to match the modulation bandwidth, maximizing signal-to-noise ratio and minimizing interference
- D) Multiple frequencies can be received simultaneously if desired
Correct Answer: C
Explanation
A key design feature in modern communications receivers is selectable bandwidth filters, often achieved through digital signal processing (DSP). This capability allows the operator to tailor the receiver’s response to the specific signal characteristics and noise environment.
The primary advantage of having selectable bandwidths is that the receive bandwidth can be set precisely to match the necessary modulation bandwidth, maximizing the desirable signal and excluding unnecessary noise and adjacent channel interference. This practice ensures that the overall system performance is optimized for the received signal, resulting in the maximum signal-to-noise ratio (SNR) possible for the current mode.
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