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.