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

Answer: A. 2.8 kHz

On the 60-meter channels, upper sideband signals are limited to a 2.8 kHz bandwidth. That fits a normal SSB voice signal inside each channel.

Tip: 60m USB: 2.8 kHz wide.

FCC rule reference: Part 97.303(h)(1)