*Question G8B06:
What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?*  

*Correct Answer is  D: 16 kHz*  

### AI Response: (may contain errors)  

To determine the total bandwidth of an FM phone transmission, we use Carson's Rule. Carson's Rule provides an estimate of the bandwidth required for frequency-modulated signals. The formula is:

$$
BW = 2 \times (\Delta f + f_m)
$$

where:
- $\Delta f$ = frequency deviation (in kHz)
- $f_m$ = maximum modulating frequency (in kHz)

For this question:
- $\Delta f = 5 \text{ kHz}$
- $f_m = 3 \text{ kHz}$

Plug these values into the formula:

$$
BW = 2 \times (5 + 3) = 2 \times 8 = 16 \text{ kHz}
$$

**Explanation of the Correct Answer:**

- **16 kHz (Choice D):** This is the correct answer because it is calculated using Carson's Rule, which accounts for both the frequency deviation and the modulating frequency.

**Explanation of Incorrect Choices:**

- **3 kHz (Choice A):** This choice only considers the modulating frequency and ignores the frequency deviation, which is crucial in FM transmission.
  
- **5 kHz (Choice B):** This choice only considers the frequency deviation and ignores the modulating frequency, which is also essential in determining the bandwidth.
  
- **8 kHz (Choice C):** This choice might mistakenly add the deviation and modulating frequency without applying the factor of 2 from Carson's Rule.

Understanding Carson's Rule is key to correctly estimating the bandwidth of FM transmissions, which is why the correct answer is 16 kHz.