Chapter 6. How Traditional Radio Works
Radio waves, prediction and discovery. Electric and magnetic fields, electromagnetic waves. Waves in free space and in waveguides. Ionosphere effect. Wavelength, speed, and frequency. Dipole antenna. Polarization of antenna. Transmitting radio signals. Receiving radio signals. Rectification of waves. Modulation of carrier wave. Amplitude modulation. Microphone as a transducer. Vacuum tubes in early radio. Sidebands in modulated carrier. Suppressed carrier and single-sideband systems. Radio in 1920s and 1930s. Interference between stations. Frequency modulation and Edwin Armstrong. Early receiver block diagrams. Detector or demodulator. Sensitivity and selectivity. TRF receivers. The superhet receiver block. ...
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