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I have run through the full video and sound IF alignment. I have achieved that has been published.
Note the IF response is flat to 4.2MHz! The chroma response is supposed to be full I to 1.5MHz and Q to 500kHz. The corresponding chroma channels will have a flat frequency response to complement the IF response.
Later sets used the "haystack" response with the color subarrier (42.17MHz) at 50% on the response slope opposite the to the video carrier. This means the chroma channel has a complementary sloping response to provide a flat double sideband +/- 500 kHz bandwidth chroma response.
I am going to go over the entire procedure once again to document and see if I can make more linear the nyquist slope.
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