*Question E1F03:
[97.315] Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?*  

*Correct Answer is  D: The amplifier is constructed or modified by an amateur radio operator for use at an amateur station*  

### AI Response: (may contain errors)  

The correct answer to the question about selling an external RF power amplifier capable of operation below 144 MHz without FCC certification is:

**D: The amplifier is constructed or modified by an amateur radio operator for use at an amateur station.**

### Explanation of the Correct Answer:
- **Amateur Radio Privileges**: Under FCC rules, amateur radio operators are allowed to construct and modify their own equipment, including RF power amplifiers, for personal use. This means that if an amateur operator builds or modifies an amplifier, it does not require FCC certification as long as it is used within the amateur service.

### Why the Other Choices are Incorrect:
- **A: Gain is less than 23 dB when driven by power of 10 watts or less**  
  - This statement is misleading. While lower gain amplifiers may have fewer restrictions, the key issue is that the amplifier must still be certified if it is sold commercially. The gain and power levels do not exempt it from certification requirements.

- **B: The equipment dealer assembled it from a kit**  
  - Simply assembling a kit does not exempt the amplifier from needing FCC certification. The dealer is still responsible for ensuring that any equipment sold complies with FCC regulations.

- **C: It was manufactured and certificated in a country which has a reciprocal certification agreement with the FCC**  
  - While equipment from certain countries may be accepted under specific conditions, this does not apply to amplifiers that are sold without certification. The amplifier must still meet FCC standards regardless of its country of origin.

### Summary:
- The key takeaway is that amateur radio operators have the privilege to construct or modify their own equipment for personal use without needing FCC certification. This is a fundamental aspect of amateur radio that encourages experimentation and self-building.

### Useful Rules of Thumb:
- Always check the FCC regulations regarding equipment certification.
- Understand the distinction between personal use and commercial sale of equipment.
- Familiarize yourself with the specific rules that apply to amateur radio operators, especially concerning construction and modification of equipment.