So - with the help of the Tiny Linear - I made my very first QSO with the Softrock. Being mindful of its sensitivity to ground loops, I installed an optocoupler at the PTT output of the AtTiny. I superglued it to the top of the board, fed it with a 1.2K resistor, and soldered a cable with an RCA jack to it.
Worked fine. The Tiny Linear took the Softrock's 2W and magically transformed it to 25W - which people can actually hear :).
