---
tags: [radio, ham-study]
---

Signal reports are used for reporting on the quality of a given frequency.

There are three values comprising **RST** (Readability, Signal, and Tone). Tone
is only used for [CW](./Frequency_modulation.md). Each value is given its own
score:

| Signal value | Scores | Meaning                                                     |
| ------------ | ------ | ----------------------------------------------------------- |
| Readability  | 1,3,5  | Unreadable, readable with some difficulty, totally readable |
| Signal       | 1,5,9  | Faint, fairly strong, very strong                           |
| Tone         | 1,5,9  | Rough, some ripple. pure                                    |

A very good signal report is therefore known as a "five and nine".