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I don't have anything that's driven by the AD8307, only the AD9850. However, the OLED doesn't care since it uses pins A4 (SDA) and A5 (CLK) for the clock and data lines for I2C interfacing. The data feed to the Nano is thru A1 using a voltage divider so we never exceed 5V on the pin. I, too, used the "two color" OLED, but treated them as separate objects, so the output looks like:

As you can see, the top line is in yellow. I made the power figure in a larger font, since that's the info we were interested in. Truth be told, even though we calibrated the output, anything after the decimal point is pretty much a guess. For its rated power level (i.e., 150W) however, I think we're below a 5% error, which is good enough in most cases. To me, it's real feature is that it provides a polite way to tune a rig without splattering everyone else on the band.

Jack, W8TEE