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This section contains scenarios and debug hints. If you are facing the same problem, try the solutions here first.

Expected Results:

  1. Bode Plot shows enough suppression at noise signal frequency.
  2. Waveform shows clear HIGH and LOW signals, a good example is shown below. (Green: input noise signal, blue: output filtered signal)
  3. Successfully demodulated messages with a reasonable PSR at 1000 packet counts. 


Scenario 1: When Bode Plot cutoff at designed frequency but no message can be demodulated.

Debug routine, possible causes and solutions:

  1. Check waveform, if signal is still noisy → Suppression level of noise signal is not enough. Consider shift cutoff frequency lower, change filter type, increase order of filter, etc.
  2. Check waveform, signal is not noisy. Pass clean signal without interference through the filter circuit, demodulate the recorded signal again, successfully demodulated with PSR. → Wanted signal is being suppressed/distorted. Consider shift the cutoff frequency higher and chec
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