Chapter 5: Radio Signals and Equipment

Section 5.1: Signal Review

a radio signal at one frequency, at constant power, is CW - continuous wave
adding information to a signal (via changes in frequency, phase angle, or amplitude) is modulation
the method of modulation is asignal's mode
an unmodulated signal carries no information
to recover information from a signal is demodulation
voice mode/phone mode - voice/speech is information
data mode/digital mode - data is information
analog - information can be understood by human
digital - information can be understood by computer