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Ionosfera (5)
Ones de ràdio (3)
53 - Physics (1)
621.3 Electrical engineering (1)
Comunicacions d'espectre eixamplat (1)
Electromagnetisme (1)
Geomagnetisme (1)
Ràdio-- Freqüència modulada (1)
Ràdio--Freqüència modulada (1)
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