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DEMODULATION BOARD Type 4281

Type 4281

DEMODULATION BOARD Type 4281

Type 4281 complements the modulation board Type 4280 with the most important demodulators. A built-in power supply, output sockets for additional devices and a loudspeaker make it a complete lab platform for reception and recovery experiments.

  • All important demodulators on one board
  • Extension for modulation board Type 4280
  • Short-circuit-proof built-in power supply
  • Additional sockets for other devices
  • Integrated loudspeaker for audio playback
  • Suitable for AM, FM, PM, PAM, PCM, PFM and PSK experiments
Datasheet (PDF) Experiment manual Modulation Methods - Demodulators (PDF)

Demodulation functions

The board covers the usual demodulation methods for analogue and digital communication. AM, FM, PM, PAM, PCM, PFM and PSK can be investigated with the provided modules.

The integrated functional groups make it easy to follow the recovery of useful signals and the effect of filters, Schmitt triggers and PLL loops.

Lab operation

The board can be operated on a desk in an inclined position or mounted in a frame. An optional box is provided for transport and storage, and experiments can also be carried out directly in the box.

Separating measurement, supply and output points makes it easier to use the board together with the modulation board and other hps systems.

Mains supply
230 V AC / 115 V AC (110 V AC); 50 ... 60 Hz; 50 VA
Output voltages
+/-15 V / 0.15 A and +5 V / 0.2 A for external transmission paths and noise sources
Board dimensions
532 x 297 x 90 mm
Board weight
3.6 kg
Box dimensions
580 x 450 x 155 mm
Box weight
6.8 kg
Recommended accessories
Accessory set Type 4280.1, modulation board Type 4280, transmitter board Type 4282, receiver board Type 4283 and manual V 0131

Taken from the tables of contents of the hps experiment manuals (titles, numbers and pages). Titles are translated into English; page references refer to the German manuals. All manuals and experiments

V 0131 Modulation methods – demodulators Manual · 231 pages 35 experiments

Main device of this manual – applies to all experiments View table of contents

  1. 1 Theoretical foundations of modulation technology – demodulation p. 3
  2. 2.1 Theoretical introduction p. 5
  3. 2.2 Measuring the frequency response of different low-pass filters p. 8
  4. 2.3 Measurements on an integrator p. 17
  5. 3.1 Theoretical introduction p. 23
  6. 3.2 Demodulation of AM signals by envelope rectification (incoherent method) p. 25
  7. 3.3 Demodulation of double-sideband AM signals (coherent method) p. 33
  8. 3.4 Demodulation of AM single sideband signals p. 41
  9. 3.5 Demodulation of AM signals with PLL support p. 50
  10. 4.1 Theoretical introduction p. 53
  11. 4.2 Demodulation of frequency-modulated signals with a C-discriminator p. 54
  12. 4.3 Demodulation of frequency-modulated signals with a counting discriminator p. 59
  13. 4.4 PLL (Phase Locked Loop) p. 64
  14. 4.5 Demodulation of frequency-modulated signals with a PLL circuit p. 74
  15. 4.6 Demodulation of phase-modulated signals with a PLL circuit p. 76
  16. 4.7 Demodulation of pulse frequency modulated signals p. 80
  17. 5.1 Theoretical introduction p. 83
  18. 5.2 Demodulation of amplitude-shift-keyed signals (ASK) p. 84
  19. 5.3 Demodulation of frequency-shift-keyed signals (FSK) with the PLL circuit p. 88
  20. 5.4 Demodulation of frequency-shift-keyed signals (FSK) with the C-discriminator p. 91
  21. 5.5 Demodulation of phase-shift-keyed signals (PSK) p. 93
  22. 6.1 Theoretical introduction p. 103
  23. 6.2 Demodulation of a pulse amplitude modulated signal with a low-pass filter p. 105
  24. 6.3 Demodulation of a PAM signal with sample and hold stage and low-pass filter p. 110
  25. 6.4 Time division multiplexing p. 113
  26. 6.5 Demodulation of a stereo signal with a switch decoder p. 117
  27. 7.1 Theoretical introduction p. 125
  28. 7.2 Transmission of DC voltage values with a PCM system p. 126
  29. 7.3 Transmission of a sinusoidal signal with a PCM system p. 132
  30. 7.4 Time division multiplexing and PCM p. 134
  31. 7.5 Quantization noise p. 136
  32. 8.1 Theoretical introduction p. 139
  33. 8.2 Demodulation of delta-modulated signals p. 140
  34. 8.3 Slope overload p. 142
  35. 8.4 Transmission of delta modulated signals with PSK p. 145
V 0132 Transmission paths Manual · 96 pages 5 experiments

Additional device in this manual View table of contents

  1. 2.6 Transmission of two analog signals in frequency division multiplex operation p. 32
  2. 2.8 Transmission of pulse frequency modulated signals p. 43
  3. 2.9 Transmission of a PCM signal p. 43
  4. 3.2 Infrared receiver spectral sensitivity p. 54
  5. 3.4 Radiation characteristics of the transmitter module p. 58
Other sections mentioning this product (1)
  1. 3 Wireless transmission using infrared rays p. 51

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