More downsizing. One unit works 100% (I have been using it for years). It includes the 5 MHz option board, which I have disabled, for 10 MHz use. I have also disabled the DC voltage on the four outputs, as I wasn't using the external Taps. These functions can be very easily restored if you need them. The second unit partially works. I haven't taken the time to see what the problem is. $150 OBO for both, plus shipping/insurance. Somewhere I have the PDF manual with schematics. Joe Gray W5JG