| PCM | |
| pwr.lines. | modulación por impulsos codificados |
|
differentiell : 87 phrases in 12 subjects |
| Antennas and waveguides | 1 |
| Chemistry | 1 |
| Communications | 5 |
| Earth sciences | 6 |
| Electronics | 59 |
| General | 1 |
| Health care | 2 |
| Information technology | 5 |
| Physical sciences | 2 |
| Power lines | 2 |
| Radio | 1 |
| Telegraphy | 2 |