The author program overview The working area of the program is divided into several windows, the sizes of which can be changed by the user by dragging the borders. The vertical red lines in this window show the working frequencies of the RX filters. The short thick black lines show TX frequencies. In PSK31 mode you see only one TX frequency. RX and TX frequencies and shifts are also shown in the status line.
Logarithmic scale is more convenient usually, but it needs more computer resources.
When squelch is switched on, the horizontal red line shows the squelch threshold. The third from top window shows an oscillogram of the decoded signal. The received symbols are displayed on the second from top window. When the RX buffer has grown to about 20kB, part of the data is moved into an invisible buffer. This button does NOT alter the signal polarity of FSK output of the COM -port.