I have a Flex 1500 driving a QRP linear to an Alpha 86. I built an external sidetone oscillator/open collector flex control output and works great on CW. However, having said that, there are no settings that will allow moderate speed CW with the internal keyer/sidetone. I use the Winkeyer with N1MM on another computer. The Flex 1500 has an inexpensive dual core Dell Laptop with nothing on it but Win 7 / PowerSDR. After 10 months of fiddling / learning, I have a pretty good setup on SSB/CW/Digital. Great radio for the money. Bought this because i can't afford a K3 hi! So far, NO PROBLEMS with IMD on PSK (not using the Alpha 86 on PSK
. Anyone wanting the schematic / pcb layout for the Flex CW controller, email me. I use the PCBExpress software.