The First 100 Years Are The Hardest

 I completed the ERC Version 4 USB kit from Vibroplex this week.  The kit comes with a CD for the calibration and test software, plus a PDF folder that has the kit assembly instructions and installation guidelines to mount the board inside the control box for specific rotators.    The kit was easy to build, but getting it working with my rotator took a bit more work.  Specific pin outs and solder points are not documented -  you have to determine that on your own.  The  theory of operations is discussed, and schematics for many rotators are provided, but I needed to use a voltmeter and a little of of trial and error to correctly wire the ERC board to the Yaesu G-450ADC rotator controller. In addition to USB cable, the kit also requires an external 12V power supply.  Vibroplex sells a fully assembled SMD surface mount version that uses power from the USB cable instead.  The board has test points for both 5V and 12V supplies.  Vibroplex also offers an RS-232 version of the ERC kit. A te