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| 双改良调频; 改进的改进型调频制 | |||
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| 改进的改进调频制 | |||
| 改进的改进型调频制; 改进的改进型调频制 (M2 FM) | |||
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modified- modified frequency modulation : 14 Phrasen in 9 Thematiken |
| Elektronik | 3 |
| Geophysik | 1 |
| Geowissenschaften | 1 |
| Informationstechnik | 4 |
| Luftabwehr | 1 |
| Mathematik | 1 |
| Multimedia | 1 |
| Telekommunikation | 1 |
| Weltraum | 1 |