| modulation | |
| antenn. | ampiezza di modulazione di velocità per segnale debole |
|
trapezoidal : 26 phrases in 13 subjects |
| Agriculture | 2 |
| Communications | 1 |
| Construction | 5 |
| Earth sciences | 1 |
| Electronics | 3 |
| Finances | 2 |
| Information technology | 2 |
| Mechanic engineering | 1 |
| Metallurgy | 2 |
| Radio | 1 |
| Scientific | 1 |
| Technology | 2 |
| Transport | 3 |