Frank,
Get a 16-18VDC power supply for your PR3. I use an 18VDC 1.1 amp power brick salvaged from an old inkjet printer.? Then get rid of the Power Pax. You won't need it. My PR3 with that 18VDC supply will reliably read/write to any sound decoder I've tried (just about all popular brands except MRC).
HTH,
Steve
"Breezlys"
