DAVE A FEW ISSUES BACK THERE WAS AN INTERFACE TO KEY THE DVR IN THE 850S FROM CT OR NA VIA THE LOGGING PORT. I HAVEN'T BUILT IT YET BUT IT SHOULD WORK. IT USED XSISTORS TO SWITCH IN THE VARIOUS RESISTANCES THAT THE 850 USES TO KEY 1 OF THE 3 STORED MESSAGES. IF YOU REMOVED THE RESITORS THEN YOU SHOULD BE ABLE TO KEY EITHER HIGH OR LOW AS REQUIRED. GL ES 73 DE N0BIW CHUCK.KRALY@QUELLE.COM