What is the maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band?

The 60-meter band is unique in amateur radio because it consists of specific channelized frequencies rather than a continuous band, and amateurs operate on a secondary basis to government users. To ensure amateur transmissions stay strictly within the assigned channel allocations and do not interfere with primary government stations, the FCC mandates a maximum bandwidth of exactly 2.8 kHz for USB (Upper Sideband) transmissions on this band. Distractors like 3 kHz or 5.6 kHz are incorrect because they exceed the strict channel spacing and bandwidth requirements negotiated with the NTIA for 60-meter operations.