*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)  

Amateur radio mesh networks are typically used for high-speed data communications and often operate on frequencies that overlap with unlicensed wireless data services. Here's why each choice is correct or incorrect:

1. **Correct Answer: B: Frequencies shared with various unlicensed wireless data services**
   - Amateur radio mesh networks often use frequencies in the 2.4 GHz and 5 GHz bands, which are shared with unlicensed services like Wi-Fi. These frequencies are suitable for high-speed data transmission and are commonly used for mesh networking.

2. **Incorrect Choices:**
   - **A: HF frequencies where digital communications are permitted**
     - HF (High Frequency) bands are generally not suitable for mesh networks due to their limited bandwidth and slower data rates. Mesh networks require higher frequencies to support the necessary data speeds.
   
   - **C: Cable TV channels 41-43**
     - Cable TV channels are not available for amateur radio use. These frequencies are allocated for cable television services and are not shared with amateur radio operators.
   
   - **D: The 60-meter band channel centered on 5373 kHz**
     - The 60-meter band is a narrow HF band with specific channels allocated for amateur use. It is not suitable for mesh networks due to its limited bandwidth and regulatory restrictions on data rates and modes.

In summary, mesh networks require frequencies that support high-speed data transmission, which is why they are typically found in bands shared with unlicensed wireless services like Wi-Fi.