*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)  

To use a new digital protocol on the air, it is essential to ensure that the technical characteristics of the protocol are publicly documented. This is important for several reasons, including interoperability, compliance with regulations, and ensuring that other operators are aware of the protocol's specifications.

### Correct Answer: C - Publicly document the technical characteristics of the protocol

- **Why this is correct**: Documenting the technical characteristics allows for transparency and helps other operators understand how to interact with the protocol. It also aids in compliance with FCC regulations, ensuring that the protocol does not interfere with existing communications.

### Why the other choices are incorrect:

- **A: Type-certify equipment to FCC standards**  
  - This is not required specifically for using a new digital protocol. Type certification is more about ensuring that the equipment meets certain technical standards, rather than the protocol itself.

- **B: Obtain an experimental license from the FCC**  
  - An experimental license is not necessary for all new protocols. It is typically required for testing new technologies that are not yet approved for general use, but not for simply using a documented protocol.

- **D: Submit a rule-making proposal to the FCC describing the codes and methods of the technique**  
  - This is a more formal process that is not required for every new protocol. Rule-making proposals are generally reserved for significant changes to regulations or new technologies that require regulatory approval.

### Summary

Before using a new digital protocol, it is crucial to publicly document its technical characteristics to ensure compliance and interoperability. The other options either pertain to equipment certification or regulatory processes that are not necessary for simply implementing a new protocol.