*Question E1B02:
[97.307(f)(2)] Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?*  

*Correct Answer is  A: 3 kHz*  

### AI Response: (may contain errors)  

To determine the acceptable bandwidth for digital voice or slow-scan TV transmissions on the HF amateur bands, we refer to the FCC regulations.

1. **Why the correct answer is correct:**
   - The correct answer is **3 kHz**. According to FCC rules, digital voice and slow-scan TV (SSTV) transmissions in the HF bands are limited to a maximum bandwidth of 3 kHz. This limitation helps to minimize interference with other users on the band and ensures efficient use of the spectrum.

2. **Why the other choices are incorrect:**
   - **10 kHz**: This bandwidth exceeds the maximum allowed for digital voice and SSTV on HF bands, making it non-compliant with FCC regulations.
   - **15 kHz**: Similar to 10 kHz, this bandwidth is also above the permissible limit for these types of transmissions.
   - **20 kHz**: This is the largest option and is well beyond the acceptable bandwidth for digital voice and SSTV, thus it is not allowed.

3. **Useful rules of thumb:**
   - Always check the specific bandwidth limits set by the FCC for different modes of operation. For HF amateur bands, digital voice and SSTV are typically restricted to 3 kHz.
   - When planning transmissions, consider the potential for interference and the need to share the band with other operators.

In summary, for digital voice and slow-scan TV on HF, stick to a maximum bandwidth of 3 kHz to comply with regulations and ensure effective communication.