*Question G1C11:
[97.313] What measurement is specified by FCC rules that regulate maximum power?*  

*Correct Answer is  D: PEP output from the transmitter*  

### AI Response: (may contain errors)  

The correct answer to the question about the measurement specified by FCC rules that regulate maximum power is:

**D: PEP output from the transmitter**

### Explanation of the Correct Answer:
- **PEP (Peak Envelope Power)** is the maximum power output of a transmitter during a transmission. The FCC regulates this to ensure that operators do not exceed power limits that could cause interference or other issues. PEP is a critical measurement because it reflects the actual power being transmitted at its peak, which is essential for compliance with regulations.

### Why the Other Choices are Incorrect:
- **A: RMS output from the transmitter**  
  - RMS (Root Mean Square) power is a measure of the average power over time, but the FCC specifically regulates peak power output, not RMS. Therefore, this choice does not align with FCC rules.

- **B: RMS input to the antenna**  
  - This measurement refers to the power being fed into the antenna, but it is not the output power of the transmitter itself. The FCC regulations focus on the output power, making this choice incorrect.

- **C: PEP input to the antenna**  
  - While PEP is a relevant measurement, this option refers to the input power at the antenna rather than the output from the transmitter. The FCC regulations are concerned with the transmitter's output, not the input to the antenna.

### Summary:
- The FCC regulates **PEP output from the transmitter** to ensure compliance with power limits.
- Other options either refer to average power or input power, which are not the focus of FCC regulations.

### Useful Rule of Thumb:
- Always remember that when dealing with FCC regulations regarding power, the focus is on the **output power** of the transmitter, specifically in terms of **PEP**.