| Clue | Source | Date |
|---|---|---|
| Radio station tuning number (9) | ||
| Signal band, radio ... | ||
| Recurrence, periodicity (9) | ||
| Unit measured in hertz (9) | ||
| What is measured in Hertz (9) | ||
| Prevalence | ||
| Oftenness | The Telegraph Quick | 09 Mar 2018 |
| Rate of occurrence | The Times Concise | 18 Dec 2017 |
| How often might it be modulated? | ||
| How often what needs translating into another language not entirely okay in the end | ||
| Part of FM. |