Question
What happens as a receiver’s noise reduction control level is increased?
Answer Options
- A) Received signals may become distorted
- B) Received frequency may become unstable
- C) CW signals may become severely attenuated
- D) Received frequency may shift several kHz
Correct Answer: A
Explanation
Noise reduction (NR) in a modern receiver is often accomplished using Digital Signal Processing (DSP). These complex algorithms analyze the incoming signal and attempt to cancel out random noise. While effective, excessive use of this processing can introduce undesirable artifacts into the desired signal.
As the receiver’s noise reduction control level is increased, the algorithms become more aggressive, leading to the risk that received signals may become distorted. This distortion can be perceived as an artificial, ‘watery,’ or robotic sound on voice signals, or a ‘thumping’ effect on Continuous Wave (CW) signals, making them difficult to copy, particularly at high settings.
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