Thanks Dave, that's very good of you and I will be very interested in how it looks. The comparators came today and hopefully over the weekend I can breadboard your schematic. Should i tap the output of the bridge before that 47K resistor, for reflected power, or after? Should I do what I have with the other IC's and decouple the comparator by the vcc pin to ground with a 220nF cap? You have been a great help!