 |
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| radio failure | |||
| arctic blackout; blue-out; radio blackout; communications blackout | |||
| blackout; signing off | |||
| |||
| arctic blackout (из-за ионосферных помех в Арктике) | |||
| прекращение радиосвязи: 10 phrases in 5 subjects |
| Astronautics | 2 |
| General | 1 |
| Mass media | 2 |
| Military | 2 |
| Telecommunications | 3 |