*Question E8A06:
What is the approximate ratio of PEP-to-average power in an unprocessed single-sideband phone signal?*  

*Correct Answer is  A: 2.5 to 1*  

### AI Response: (may contain errors)  

To understand the ratio of Peak Envelope Power (PEP) to average power in an unprocessed single-sideband (SSB) phone signal, we need to consider how SSB modulation works.

### Correct Answer: 2.5 to 1

1. **Why the correct answer is correct:**
   - In an unprocessed SSB signal, the PEP is typically about 2.5 times the average power. This is because SSB modulation allows for the transmission of voice signals with a peak power that is significantly higher than the average power due to the nature of speech, which has varying amplitude levels. The peaks in the signal can reach up to 2.5 times the average power level.

### Incorrect Choices:

2. **Why the other choices are incorrect:**
   - **B: 25 to 1**
     - This ratio is too high for SSB signals. Such a high ratio might be more applicable to other types of modulation or specific conditions, but not for standard SSB.
   - **C: 1 to 1**
     - A 1 to 1 ratio implies that the peak power and average power are equal, which is not the case for SSB. The peak power is always higher than the average power due to the transient nature of voice signals.
   - **D: 13 to 1**
     - This ratio is also too high for typical SSB signals. While it might apply in some specific scenarios, it does not represent the general behavior of unprocessed SSB signals.

### Useful Formulas or Rules of Thumb:
- For SSB signals, a common rule of thumb is:
  $$ \text{PEP} \approx 2.5 \times \text{Average Power} $$

This relationship helps in understanding the efficiency and power requirements for SSB transmission, which is crucial for effective communication in amateur radio.