*Question T7B02:
What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?*  

*Correct Answer is  A: The receiver is unable to reject strong signals outside the AM or FM band*  

### AI Response: (may contain errors)  

To understand why a broadcast AM or FM radio might unintentionally receive an amateur radio transmission, let's analyze the correct answer and the other options.

### Correct Answer: A
**Reasoning:**
- Broadcast AM and FM radios are designed to operate within specific frequency bands. If a strong signal from an amateur radio transmission is present outside these bands, the receiver may not effectively filter it out. This inability to reject strong signals is known as "selectivity" or "adjacent channel rejection."
- When the selectivity is poor, the receiver can pick up unwanted signals, leading to interference or unintended reception of amateur transmissions.

### Incorrect Answers:
**B: The microphone gain of the transmitter is turned up too high**
- This option refers to the audio input stage of the transmitter. While high microphone gain can lead to distortion or over-modulation of the audio signal, it does not directly cause a broadcast radio to receive amateur signals. The issue is more about the receiver's ability to filter out unwanted signals rather than the transmitter's audio settings.

**C: The audio amplifier of the transmitter is overloaded**
- Overloading the audio amplifier can cause distortion in the transmitted signal, but it does not affect the reception capabilities of a broadcast radio. The radio's ability to reject unwanted signals is independent of how the transmitter is modulating its audio.

**D: The deviation of an FM transmitter is set too low**
- Deviation in FM transmission refers to how much the carrier frequency varies from its center frequency based on the audio input. If the deviation is too low, it may result in poor audio quality or weak signals, but it does not cause a broadcast radio to receive the amateur signal unintentionally. The issue of unintentional reception is more about the receiver's selectivity.

### Summary
- The key factor in unintentional reception of amateur signals by a broadcast radio is the receiver's inability to reject strong signals outside its designated band (Choice A).
- The other options relate to transmitter settings and performance, which do not directly influence the receiver's selectivity or its ability to filter out unwanted signals.

### Useful Rule of Thumb
- **Selectivity**: A receiver's ability to isolate a desired signal from others. Good selectivity helps prevent interference from strong signals outside the intended frequency band.