Editor: It can work as narrow-band sound DSP-filter also. No additional hardware required — you need only receiver and computer with a sound card. Can integrate with AALog Logger. It is a software morse decoder that really work!
The working area of the program is divided into three windows, the sizes of which can be changed by the user by dragging the borders.
In the top window the current spectrum of a signal (blue line) and a peak detector of spectral components (green line) is shown. Ruler under this window shows frequencies of sound spectrum.The vertical red line in the top window shows the working Frequency of the filter. To change the working frequency, click on the desired frequency (probably a peak). The short thick black line is the marker of TX frequency. It is used to help with zero-beat tuning. To change the TX marker position, click on the desired frequency by right mouse button (or by left mouse button with "Ctrl" key pressed).
The "Zoom" menu and "Alt-1" "Alt-7" Hotkeys change frequency scale of Spectrogram.
To move a visible part of spectrogram to left or right drag it by mouse with Alt key pressed.
The "AFC" button (auto frequency control) adjusts the long red line (working frequency) to the closest peak frequency. The numbers to the left of the AFC button determines the limits of AFC. The first number is local deviation in hertzs, i.e. maximal deviation from current frequency. Second number is global deviation in hertzs, i.e. maximal deviation from last user-selected frequency. User-selected frequency is shown at spectrogram by short red line .
