Уровень 0 · материалов: 3
В кластер входят документы, описывающие технические аспекты работы и уязвимости мобильных сетей и радиосигналов, и не входят документы, не касающиеся беспроводной передачи данных.
Общие признаки: беспроводные коммуникации, стандарты GSM, 3G и 4G, техническое функционирование сети
Группа выше: Технологии мобильной связи
Смысл: The main idea is to explore the technical functionality, legality, and practical application of signal jammers, demonstrating how they disrupt wireless communications across various cellular standards.
A technical review of a 5-channel signal jammer detailing its specifications, Russian legal requirements, internal components, and spectrum analysis results.
Смысл: The text explores whether it is technically possible to locate or eavesdrop on a mobile phone that is switched off, weighing anecdotal reports and theoretical technical loopholes against standard GSM behavior.
The author analyzes various technical theories and reports to determine if a factory-standard mobile phone can still be tracked or monitored after being powered off.
Смысл: The main idea is that the frequency shift caused by the Doppler effect at typical vehicle speeds is negligible and easily compensated for by the Automatic Frequency Control (AFC) systems integrated into GSM, 3G, and 4G receivers.
The Doppler effect at common travel speeds causes a frequency shift far below the compensation threshold of mobile network receivers, making it a non-issue for network stability.