Question E1C01:
[97.303] What is the maximum bandwidth for a data emission on 60 meters?  

Choices:  
A: 60 Hz  
B: 170 Hz  
C: 1.5 kHz  
D: 2.8 kHz    

Correct Answer is  D: 2.8 kHz  

To calculate the maximum allowed occupied bandwidth on 60 meters for data:  
$$B_{\text{occupied}} \le 2.8\ \text{kHz}$$

Why D (2.8 kHz) is correct:
- FCC Part 97.303 for the 60 m band limits RTTY/data emissions (and USB phone) to a maximum occupied bandwidth of 2.8 kHz to fit within the channelized allocation and avoid adjacent-channel interference.

Why the others are incorrect:
- A: 60 Hz — Far below the allowed maximum; some digital modes are this narrow, but the question asks for the maximum permitted bandwidth.
- B: 170 Hz — Often associated with classic RTTY shift, but not the maximum allowed bandwidth; still much less than the allowed limit.
- C: 1.5 kHz — Within the allowed limit but not the maximum; there is no 1.5 kHz cap on 60 m.

Rules of thumb:
- On 60 m, USB phone and RTTY/data must have occupied bandwidth ≤ 2.8 kHz.
- Keep your digital tones centered so the entire signal stays within the assigned channel; avoid audio frequencies above about 2.8 kHz in USB-based digital modes.