*Question E1F09:
[FCC Part 97.113(a)(4)] Which of the following cannot be transmitted over an amateur radio mesh network?*  

*Correct Answer is  C: Messages encoded to obscure their meaning*  

### AI Response: (may contain errors)  

In the context of amateur radio operations, particularly under FCC Part 97.113(a)(4), it's important to understand the restrictions on the types of messages that can be transmitted.

1. **Why the correct answer is correct:**
   - The correct answer is **C: Messages encoded to obscure their meaning**. According to FCC regulations, amateur radio operators are prohibited from transmitting messages that are encoded in a way that obscures their meaning. This rule is in place to ensure that communications remain open and accessible, promoting the spirit of amateur radio as a service for public interest and emergency communications.

2. **Why the other choices are incorrect:**
   - **A: Third party traffic**: This is allowed under certain conditions. Amateur radio operators can transmit third-party traffic as long as it complies with the regulations and the third party is in a country that allows such transmissions.
   - **B: Email**: Sending email over an amateur radio mesh network is permissible. Many amateur radio operators use digital modes to send emails, and as long as the content adheres to the regulations, it is allowed.
   - **D: All these choices are correct**: This option is incorrect because not all the choices are prohibited. As explained, both third-party traffic and email can be transmitted under the right conditions.

3. **Useful rules of thumb:**
   - Always ensure that your transmissions are not encoded to obscure meaning.
   - Familiarize yourself with the specific regulations regarding third-party traffic and digital communications to ensure compliance.
   - Remember that the primary purpose of amateur radio is to provide a service to the public and support emergency communications.

By understanding these points, you can better prepare for questions related to the types of messages that can be transmitted over amateur radio networks.