Morse radio narrow bandwidth noisy signals

Morse can stay readable in radio noise

Morse radio signals use about 100–150 Hz of bandwidth, far less than the roughly 2,400–2,800 Hz used for single-sideband speech. Receiver filters can isolate the narrow signal, and the ear's natural selectivity helps distinguish it from interference, even when signals are weak.

Submarines can navigate without GPS

An inertial navigation system works out a submarine’s position from its motion sensors, without outside information once aligned. Weather and jamming do not disrupt it. But small errors build over time, so the system needs occasional position fixes.

Plastic waste could become hydrogen and graphene

Researchers have demonstrated a way to heat polyethylene—the plastic used in many bags and containers—so it breaks down into hydrogen gas and graphene, a form of carbon just one atom thick. The approach could turn waste plastic into two useful materials, although scaling it up remains a challenge.

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Morse radio narrow bandwidth noisy signals

Morse can stay readable in radio noise

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