RSV code for SSTV transmissions
R – Readability S – Strength V – Video
1 Unreadable Faint signal, barely perceptible, Picture unreadable
2 Barely readable, Very Weak, picture barely visible
3 Readable with difficulty, Weak, Readable with flaws
4 Readable with no difficulty, Fair, Very good picture some flaws
5 Perfectly readable, Fairly Good, Perfect picture no flaws
6 Good
7 Moderately Strong
8 Strong
9 Very strong signals
| Number | R - Readability | S - Strength | V - Video | |
| 1 | Unreadable | Faint signal, barely perceptible, | Picture unreadable | |
| 2 | Barely readable | Very Weak | picture barely visible | |
| 3 | Readable with difficulty | Weak | Readable with flaws | |
| 4 | Readable with no difficulty | Fair | Very good picture some flaws | |
| 5 | Perfectly readable, | Fairly Good, | Perfect picture no flaws | |
| 6 | not used | Good, | not used | |
| 7 | not used | Moderately Strong, | not used | |
| 8 | not used | Strong | not used, | |
| 9 | not used\ | Very strong signals, | not used |