Discussion
Which component corrects tracking at the high-frequency end?
Answer: C
The trimmer is in parallel with the tuning capacitor, so its fixed value matters most when the variable part is at its smallest, at the top of the band. The padder in series governs the bottom end. Adjusting the coil core changes inductance and shifts the whole range rather than one end. And the detector load has nothing to do with tuning. Series and parallel adjustments act at opposite ends of a tuning range, which is the general principle behind every three-point alignment.
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