I tried SIM31 again, and it sounds familiar like PSK31 and it is a way. But it uses FEC (Forward Error Correction) and it copied signals very well. Much better than PSK31. Good for QRP work. You also can run the software in automatic mode. First I thought, why should I make a contact with a computer. But I did. Today I worked RA3AL/QRP (see photo of his shack) running 1 watt and I was using 5 Watts on 20 meter. Perfect qso. Also worked RN9AZ Asiatic Russia 3500 km. I wonder what the mode will do on 2 or 6 meters. So, when you are in for something new, try SIM31.