Lequel des modes suivants peut fonctionner avec le rapport signal/bruit le plus bas mesuré dans une bande passante de 2500 Hz?

Why

FT8 works at the lowest signal-to-noise ratio because it uses advanced digital coding and long transmission times to pull signals out of heavy static that would drown out other modes. The full explanation — and one for every question — is in Pro.

Practise this section

Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.

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