In no particular order (all are needed). 1. MUCH BETTER QSK 2. Stable output power 3. Opto-coupler for RIT/XIT (don't take away XIT and substitute IF shift) with CLEAR function 4. As turn RIT/XIT, have offset (in KHz) momentarily replace freq display so we can see the amount of offset (essential for XIT). Ala K3. 5. MUCH BETTER QSK de Doug KR2Q