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And BTW..

My idea of using the IA CMMR seems to get around the worry of the distortion of the oscillator, and the distortion of the nulling circuit, while concentrating on amplifying the difference between what goes into the cable and what comes out. I'm not sure if it will work as I think it will, but had posted the idea before here, with no criticism of the technique from anyone, so I still stab in the dark here.

Near as I figure, if my osc had 1% distortion, that 1% would be nulled out at the IA by it's CMMR to say 120-130 db down (assuming I can tame the resistors down), leaving the cable error to be amplified. This vs trying to get the osc to have distortion 120 db down, or a really tight null.

I'll actually use an HP 3325A for source, but don't have it's specs available as I type.

Cheers, John


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