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A physicist.^[ref]

Wireless telegraphy links the dynamics of a transmitter, propagation and the response of a receiver. A successful detector reading depends on that complete chain, rather than on the transmitter alone.

A physicist.^[ref]

Wireless telegraphy connects an oscillating electrical circuit to a distant receiver. Tuning and coupling determine how effectively the circuit transfers a signal.

Guglielmo Marconi and Karl Ferdinand Braun shared the award equally for developing wireless telegraphy.^[ref] Braun's receiver coupling experiment connects that history to resonance and the selectivity of a receiver.

Radio communication conveys information using radio waves coupled into and out of space by antennas. Amplitude modulation and frequency modulation vary a carrier wave; wireless telegraphy can instead encode symbols in transmission intervals. The useful separation is between the rapid electrical oscillation and the slower message timing. A receiver needs both frequency selection and a way to turn its selected signal into a readable output.

Telegraphy represents written symbols by agreed sequences of distinguishable signals. In wireless telegraphy, a key can select short and long transmission intervals; a receiver must recover their timing, rather than reproduce every rapid electrical oscillation as a visible mark.