Item No.: CO4204-9M

Course AM/FM modulation/demodulation

Includes:

  • 1 Experiment card with Colpitts/Hartley oscillator
  • 1 Experiment card with AM modulator/demodulator, AM modulator switchable between AM/DSB, product demodulator and diode detector
  • 1 Experiment card with FM modulator/phase demodulator
  • Storage case
  • Labsoft browser and course software

Course contents:

  • Introduction to the principle of amplitude modulation by measuring AM modulator signals over time
  • Recording the modulation trapezoid for various modulation depths
  • Demodulation of an amplitude modulated signal
  • Introduction to the principle of a diode detector
  • Demonstration of double side-band modulation (DSB)
  • Tuning the modulator to minimise residual carrier
  • Recording signal, phase shift and modulation trapezoid for DSB
  • Demonstration of single side-band modulation (SSB)
  • Recovery of the original signal from an SSB signal with the help of an integrated double balanced mixer
  • Demonstration of the principle of frequency modulation and demodulation
  • Explanation of the term "instantaneous frequency" for a modulated signal
  • Determination of the maximum frequency deviation in an FM signal
  • Effect of low-frequency amplitude and frequencies on an FM signal
  • Explanation of the modulation index
  • Explanation of the relationship between LF amplitude, LF frequency and phase shift
  • Ratio detector and phase detector (Foster-Seeley)
  • Recovery of a modulated signal by a phase demodulator
  • Course duration 3 h approx.