| |||
| signal à fréquence intermédiaire; signal FI | |||
|
intermediate -frequency : 37 phrases in 11 subjects |
| Astronomy | 1 |
| Automated equipment | 1 |
| Aviation | 1 |
| Communications | 16 |
| Earth sciences | 1 |
| Electronics | 6 |
| Information technology | 5 |
| Medical appliances | 1 |
| Metallurgy | 1 |
| Radio | 2 |
| Telecommunications | 2 |