night-time
| F-layer
| night time | |
| lab.law. transp. nautic. | période nocturne |
| F layer | |
| agric. | horizon F |
| commun. | couche F |
| radio | région F |
| |||
| période nocturne | |||
|
night-time : 10 phrases in 7 subjects |
| Astronomy | 1 |
| Communications | 1 |
| Electronics | 2 |
| Environment | 2 |
| Finances | 1 |
| Telecommunications | 2 |
| Transport | 1 |