Amateur radio license exams typically have a question about the bandwidths taken up by various modulation types. The concept behind the question is pretty obvious — as guardians of the spectrum, operators really should know how much space each emission type occupies. As a result, the budding ham is left knowing that continuous wave (CW) signals take up a mere 150 Hertz of precious bandwidth.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/30/how-much-bandwidth-does-cw-really-occupy/