I´m going to purchase another K3 unit and just wonder wich filters put on. On the 1st i have: Main rx: 2.7 / 2.1 & 400hz for cw I use only for serious dx and contesting SSB, starting on CW and thinking about Digi modes. Anyone could tell me if i have better choices changing this filter setup? 73´s and tnx in advance PY2ADR / Z¨Y2C Adriano