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Three point tracking is achieved by __________

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Three point tracking is achieved by __________

(a) Double conversion

(b) Variable selectivity

(c) Variable Sensitivity

(d) Padder capacitor

I got this question by my college director while I was bunking the class.

The doubt is from Comparison Between PM and AM in division Noise of Analog Communications

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Correct option is (d) Padder capacitor

To explain I would say: To achieve three point tracking a capacitor is connected in series with local oscillator coil. This capacitor is called padder capacitor.

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