The maximum bandwidth of an amateur radio station's transmission allowed in the band 28 MHz to 29.7 MHz is:

In Canada, the 10-meter amateur radio band (28 MHz to 29.7 MHz) has a legally permitted maximum bandwidth of 20 kHz. This specific limit is an exception to the stricter bandwidths allowed on the lower HF bands. The 20 kHz allowance permits the use of wider bandwidth modes, such as Frequency Modulation (FM) voice, which is commonly used in the upper portion of the 10-meter band. Distractors like 6 kHz apply to the lower HF bands, while 30 kHz applies to VHF bands. Remembering that 10 meters bridges the transition between HF and VHF can help you recall its unique 20 kHz limit.