Hardware build by OZ2HNS for use in our clubstation OZ8SMA Here is a video where you can see the decoder in function. The magic in this code is the tone detection based on the goertzel formular, which means that you just put in the audio on an analog pin and then the processor make some calculations and if there is a tone you will get a magnitude value. If you want to build a cw decoder without using other active components than an atmel 328 - Arduino UNO, then this is sure something for you. Since the signal after BPF is output to the audio output, it can also be used as an AF-CW filter.EASY BUILD CW DECODER BASED ON DSP GOERTZEL CODE * There will be a time lag of about 1 to 2 seconds for AFD tracking.Ħ.CW Speed Control Low, Mid1, Mid2 or Highĩ.Input signal recording / playback function You can also hold the AFD / AGC parameters by pressing the Lock button. The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control).
AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button. In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage.
Make fine adjustments to each parameter according to the reception status.
Usually about 5 to 10 characters are required for speed synchronization of Morse Code.Īdjust the input signal so that the peak value changes from level 6 to level 7. Signals with good S/N can be decoded correctly, but signals with bad S/N cannot be decoded correctly.Īlso, the performance will be degraded for extremely slow or fast signals. This is an App that decodes Morse code input from the microphone. It is a Morse practice App that you can use to check if you are keying the correct code.
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