*Question G1C07:
[97.309(a)(4)] What must be done before using a new digital protocol on the air?*  

*Correct Answer is  C: Publicly document the technical characteristics of the protocol*  

### AI Response: (may contain errors)  

Before using a new digital protocol on the air, the FCC requires that the technical characteristics of the protocol be publicly documented. This ensures transparency and allows other operators to understand and potentially use the protocol.

### Explanation:

1. **Correct Answer: C - Publicly document the technical characteristics of the protocol**
   - The FCC mandates that any new digital protocol must have its technical details available to the public. This is to ensure that the protocol can be monitored and understood by other operators and regulatory bodies, maintaining the integrity and openness of amateur radio communications.

2. **Why the Other Choices are Incorrect:**
   - **A: Type-certify equipment to FCC standards**
     - Type certification is generally required for commercial radio equipment, not for amateur radio protocols. Amateur radio operators are allowed to experiment with and modify their equipment without needing type certification.
   - **B: Obtain an experimental license from the FCC**
     - An experimental license is not necessary for using a new digital protocol in amateur radio. Such licenses are typically required for non-amateur experimental operations.
   - **D: Submit a rule-making proposal to the FCC describing the codes and methods of the technique**
     - Submitting a rule-making proposal is a lengthy and formal process used to change FCC rules, not for introducing new digital protocols in amateur radio.

### Key Point:
- **Public Documentation**: Ensures that the protocol can be used and monitored by others, aligning with the amateur radio community's spirit of sharing and collaboration.