why not just run a power cord from the 197 to your DC power supply (assuming you have one in the shack)?? no muss, no fuss.I have a line on a replacement for mine that went Tango Uniform, the requirement is 13.8v & 600ma. The one I can get is 12v 500ma. Suitable? Or would a 13v 800ma be better? Possible issues or concerns?