*Question G8B07:
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?*  

*Correct Answer is  B: 416.7 Hz*  

### AI Response: (may contain errors)  

To determine the frequency deviation of a reactance modulated oscillator in an FM transmitter, we need to understand the relationship between the oscillator frequency, the carrier frequency, and the frequency deviation.

### Explanation:

1. **Frequency Multiplication:**
   - The oscillator frequency is 12.21 MHz.
   - The carrier frequency is 146.52 MHz.
   - The frequency multiplication factor is the ratio of the carrier frequency to the oscillator frequency:
     $$ \text{Multiplication Factor} = \frac{146.52 \, \text{MHz}}{12.21 \, \text{MHz}} $$

2. **Calculate the Multiplication Factor:**
   $$ \text{Multiplication Factor} = \frac{146.52}{12.21} \approx 12 $$

3. **Determine the Frequency Deviation:**
   - The desired frequency deviation at the carrier frequency is 5 kHz.
   - The frequency deviation at the oscillator frequency is the deviation at the carrier frequency divided by the multiplication factor:
     $$ \text{Deviation at Oscillator} = \frac{5 \, \text{kHz}}{12} \approx 416.7 \, \text{Hz} $$

### Why the Correct Answer is Correct:

- **Choice B: 416.7 Hz** is correct because it matches the calculated frequency deviation at the oscillator frequency after considering the multiplication factor.

### Why the Other Choices are Incorrect:

- **Choice A: 101.75 Hz** is incorrect because it does not match the calculated deviation.
- **Choice C: 5 kHz** is incorrect because this is the deviation at the carrier frequency, not the oscillator frequency.
- **Choice D: 60 kHz** is incorrect because it is unrelated to the calculated deviation and does not fit the context of the problem.

By understanding the multiplication factor and how it affects frequency deviation, you can determine the correct deviation for the oscillator in an FM transmitter.