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I wonder if more of these '40's sets would work on cable signals with a proper IF alignment?
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With proper alignment of the RF and IF circuits, each channel's response curve would have the correct shape to pass only that channel's signal through to the detectors. Accurate, precise and stable marker frequencies are essential for proper alignment. I allow my alignment instruments and the chassis under test a 45-minute warmup period before beginning alignment and verify each marker frequency with a frequency counter.