Which receiver function listed below is NOT operator-adjustable?

Which receiver function listed below is NOT operator-adjustable?

• A. Amplification
• B. Compensation
• C. Demodulation
• D. Rejection

Answer: (C)

The key thing this question tests is which part of the receiver is something you actively tune for varying signal conditions versus a fixed processing step. Amplification is something you adjust to set the signal level so weak signals can be heard clearly. Compensation is adjusted to counteract distortion or hardware/imperfect channel effects, helping preserve the signal integrity. Rejection refers to filtering or suppressing unwanted interference, which you tune to keep the desired signal clean. Demodulation, however, is the process of extracting the original information from the carrier. It follows the modulation scheme used on the signal and is typically implemented as a fixed function in the receiver. While you may select the proper demodulation mode to match the incoming signal, it isn’t an operator-adjustable knob in the same sense as gain, compensation, or rejection. It’s determined by the signal format rather than something you continuously tune to optimize reception. So, demodulation is not operator-adjustable.

The key thing this question tests is which part of the receiver is something you actively tune for varying signal conditions versus a fixed processing step. Amplification is something you adjust to set the signal level so weak signals can be heard clearly. Compensation is adjusted to counteract distortion or hardware/imperfect channel effects, helping preserve the signal integrity. Rejection refers to filtering or suppressing unwanted interference, which you tune to keep the desired signal clean.

Demodulation, however, is the process of extracting the original information from the carrier. It follows the modulation scheme used on the signal and is typically implemented as a fixed function in the receiver. While you may select the proper demodulation mode to match the incoming signal, it isn’t an operator-adjustable knob in the same sense as gain, compensation, or rejection. It’s determined by the signal format rather than something you continuously tune to optimize reception.

So, demodulation is not operator-adjustable.