In what portion of the 630-meter band are phone emissions permitted?

The 630-meter band, which spans from 472 to 479 kHz, is a relatively new and narrow low-frequency (LF) allocation for amateur radio. According to FCC Part 97 rules, phone (voice) emissions are legally permitted across the entire 7 kHz width of this band. While it is technically legal to use phone emissions anywhere in the band, it is highly impractical and rarely done in practice. A standard single-sideband (SSB) signal occupies about 3 kHz of bandwidth, meaning a single voice transmission would consume nearly half of the entire available band. Because of this narrowness, most operators stick to narrow-band digital modes like WSPR or JT9. However, the exam specifically tests your knowledge of the legal regulations rather than operating conventions, making 'The entire band' the correct answer.