*Question E2C04:
Which of the following frequencies can be used for amateur radio mesh networks?*  

*Correct Answer is  B: Frequencies shared with various unlicensed wireless data services*  

### AI Response: (may contain errors)  

To understand which frequencies can be used for amateur radio mesh networks, let's analyze the options provided:

### Correct Answer: 
**B: Frequencies shared with various unlicensed wireless data services**

- **Explanation**: Amateur radio mesh networks often utilize frequencies that are also used by unlicensed wireless data services. These frequencies are typically in the 2.4 GHz and 5 GHz bands, which are commonly used for Wi-Fi and other unlicensed communications. This allows amateur operators to set up mesh networks that can interconnect various nodes without requiring a specific amateur band allocation.

### Why the Other Choices are Incorrect:

- **A: HF frequencies where digital communications are permitted**  
  - **Explanation**: While HF frequencies can support digital communications, they are not typically used for mesh networking due to propagation characteristics and bandwidth limitations. Mesh networks require higher data rates and more reliable connections, which are better suited to VHF/UHF or higher frequencies.

- **C: Cable TV channels 41-43**  
  - **Explanation**: Cable TV channels are not available for amateur radio use. These frequencies are allocated for commercial cable television services and are not permitted for amateur operations.

- **D: The 60-meter band channel centered on 5373 kHz**  
  - **Explanation**: The 60-meter band is a restricted band for amateur use, with specific channels and power limits. It is not typically used for mesh networking due to its limited bandwidth and the regulatory constraints on its use.

### Summary:
- Amateur radio mesh networks are best suited for frequencies shared with unlicensed wireless data services (Choice B).
- HF frequencies (Choice A) and the 60-meter band (Choice D) are not ideal for mesh networking.
- Cable TV channels (Choice C) are not available for amateur use at all.

This understanding will help you choose the correct frequencies for setting up amateur radio mesh networks effectively.