Re: explaining i/q

[David Hagood]

I am sorrowful that you have decided you are going to stick with an 
explanation that is fundamentally incorrect. I know how direct 
conversion systems work - I design the software for them for a living. 
What you are basing your mental model on is an optimization for the case 
where the system is both sub-sampling the signal and going digital in 
the same operation. However, in many extremely high sample rate systems, 
the signal is brought down to baseband by mixing it with analog 
quadrature signals - that's the place where I and Q come from - and I 
assure you the only "delay by 90 degrees" is in the creation of the 
quadrature LO signals, not in the sampling of the actual data. But I've 
been around the Sun enough times to know that since you have decided 
upon this course and don't seem to want to change, there's no point in 
continuing to try to help.

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