
I
n Experiment 3, you built AMT1, which
modulated a carrier wave with an audio
frequency, and broadcast it in the AM broadcast
band. However, its carrier was not very stable,
and you had no way of knowing exactly what its
frequency was.
In Experiment 5, you used a Raspberry Pi Pico’s
pulse-width modulation (PWM) hardware as a
better way to generate a carrier wave, enabling
you to set the frequency accuratel ...