What is the maximum bandwidth for a data emission on 60 meters?

The 60-meter band is unique in US amateur radio because it is heavily restricted and channelized. Amateurs operate on a secondary basis, sharing the band with primary federal government users. To prevent interference, the FCC restricts operations to a specific set of channels. For any authorized emission mode on these 60-meter channels—whether it is Upper Sideband (USB) voice, CW, or data—the maximum permitted bandwidth is exactly 2.8 kHz. This ensures that the amateur signal remains strictly within the allocated channel allocation centered on the assigned frequencies. Students often confuse this with traditional HF data limits, which historically had much narrower bandwidth restrictions depending on the specific band and baud rate, but 60 meters applies this flat 2.8 kHz limit to all permitted modes.