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the IF is an intermediate freqency signal 44mhz. All the tuner does is takes the entire old TV broadcast band and selects a channel within that band and converts it to a single freqency, allowing for a better amp (only has to deal with one freq) to work. From there the AM modulated video signal is detected by a diode and the result is the composite signal. this is the same signal you get from the yellow rca lead on the DVD or converter box. the only difference will prob be the amplitude which is prob greater from the IF amp/detector diode vs. the DVD video out.
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