*Question G8B12:
What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?*  

*Correct Answer is  A: Intermodulation*  

### AI Response: (may contain errors)  

The correct answer to the question is **A: Intermodulation**. Here's a breakdown of why this is the case and why the other options are incorrect.

### Explanation of the Correct Answer: Intermodulation
- **Intermodulation** occurs when two or more signals mix in a non-linear circuit, such as an amplifier or mixer. This mixing can produce additional frequencies that are not present in the original signals, known as spurious outputs. 
- The unwanted frequencies generated are typically at combinations of the original frequencies, such as the sum and difference of the input frequencies and their harmonics. 

### Why the Other Choices are Incorrect:
- **B: Heterodyning**
  - Heterodyning is a process where two signals are mixed to produce a new signal at a frequency that is the sum or difference of the original frequencies. While it can produce new frequencies, it is typically a desired process in radio communications (e.g., in superheterodyne receivers) rather than an unwanted one.
  
- **C: Detection**
  - Detection refers to the process of extracting the original information from a modulated carrier wave. This is a necessary step in demodulating signals and does not inherently produce unwanted outputs.
  
- **D: Rolloff**
  - Rolloff describes the rate at which a filter attenuates signals beyond its cutoff frequency. It is a characteristic of filters and does not involve the mixing of signals or the generation of spurious outputs.

### Summary
- **Intermodulation** is the process that leads to unwanted spurious outputs due to the non-linear mixing of signals.
- The other options either describe processes that are intended or do not involve the mixing of signals in a way that produces unwanted frequencies.

This understanding is crucial for recognizing how unwanted signals can affect communication systems and for troubleshooting issues in radio operations.