It’s based on pulse-width modulation to implement a cheap but accurate current-loop transmitter. A dual-channel isolator (E1-E2-Q1-Q2) provides galvanic isolation of the PWM input.

Those $1 315/433 MHz transmitter/receiver pills would do the trick here. Afaik they are pure analog fsk meaning no delay, low bitrate should be a problem for a keyboard. Report comment.

[4] Theoretical Comparison of Different Envelope Elimination and Restoration Transmitter PWM Modulator Configurations to Expand the Possible Antenna Mismatch. Sensors (2023). Back to "Power ...

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