Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform (a constant amplitude and ...

What is QAM (quadrature amplitude modulation)? QAM (quadrature amplitude modulation) is a method of combining two amplitude modulation (AM) signals into a single channel. This approach helps double ...

A radio wave of a specific frequency that is modulated or changed in some way in order to transmit data. The amplitude of the carrier wave can be increased—for example, to indicate a one or zero of ...

This basic beat oscillator makes continuous wave keyed code and single sideband suppressed carrier signals audible. A recent Design Idea from contributor Gavin Watkins shows an inexpensive add-on beat ...