I need to know if this is normal or not. When aligning the 737, things go fine until T5. T5 couples the mixer into the ceramic filters. I find adjusting it has almost no effect on the signal amplitude, even though I'm right down near the noise where I peaked everything else. Anybody done one of these or similar?
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Assuming that you're aligning with a distortion analyzer in the "modern"/1970s manner, tuning for minimum THD+N at progressively lower RF levels, this isn't necessarily unusual. That transformer is very low Q compared to the ceramic filters, so doesn't show peaks very well. You'd be safe and correct to return the core to its original position and call it good. You are measuring everything important in this case.
All good fortune,
Chris
All good fortune,
Chris
