Aiy,
I tried your method for tuning the YTF but I'm apparently missing something. From your post:
With the YTF offset frequencies in hand, the next step is to evaluate the DAC polynomial with:
DAC(input_frequencies + YTF_offset_frequencies) = DAC_setting_new
To get the new polynomial, do a polynomial fit using the DAC_setting_new and the input_frequencies arrays.
So let's say at 4GHz, the offset is 400kHz. Then the pair for the polynomial fit is (4,000,000,000 , 4,000,400,000.).
Is that correct???
Mark