1. A geographic region where electronic signals, telecommunications, or radio transmissions cannot be received or transmitted effectively
The remote mountain valley was a signal blackout area for mobile phones.
O vale montanhoso remoto era uma zona de cobertura nula para telefones celulares.
2. A location during spacecraft re-entry where radio communications are temporarily lost due to plasma interference
During re-entry, the spacecraft entered a signal blackout area lasting several minutes.
Durante a reentrada, a espaçonave entrou em uma zona de cobertura nula que durou vários minutos.
3. An area deliberately created by military or government entities where all electronic communications are jammed or blocked
The military established a signal blackout area around the testing facility.
Os militares estabeleceram uma zona de cobertura nula ao redor da instalação de testes.