The tuned circuit of the oscillator in a simple AM transmitter employs $$40$$μH coil and $$12$$ $$nano-farad$$ (nF) capacitor. If the oscillator output is modulated by audio frequency of $$5$$ kHz, which of the following frequencies doesn’t appear in the output AM?

Question

The tuned circuit of the oscillator in a simple AM transmitter employs $$40$$μH coil and $$12$$ $$nano-farad$$ (nF) capacitor. If the oscillator output is modulated by audio frequency of  $$5$$ kHz, which of the following frequencies doesn’t appear in the output AM?

Infinity Learn · Accepted Answer

Given : $$L=40$$×$$10$$−$$6H$$ ,  $$C=12$$×$$10$$−$$9F$$   ,   $$fm=5$$ kHz   Carrier frequency,  $$fc=12$$$$π$$LC ⇒$$fc=12$$×$$3.14480$$×$$10$$−$$15$$ ⇒$$fc=16.2848$$×$$10$$−$$14$$  ⇒$$fc=1076.28$$×$$6.9=1000043.332$$×$$103$$  ≃  $$230$$ kHz  $$fUSB=fm+fc=230+5=235KHz$$  $$fLSB=fm$$−$$fc=230$$−$$5=225KHz$$

The tuned circuit of the oscillator in a simple AM transmitter employs $40 μ H$ coil and 12 nano-farad (nF) capacitor. If the oscillator output is modulated by audio frequency of 5 kHz, which of the following frequencies doesn’t appear in the output AM?

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The tuned circuit of the oscillator in a simple AM transmitter employs 40μH coil and 12 nano-farad (nF) capacitor. If the oscillator output is modulated by audio frequency of 5 kHz, which of the following frequencies doesn’t appear in the output AM?

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Ready to Test Your Skills?

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The tuned circuit of the oscillator in a simple AM transmitter employs $40 μ H$ coil and 12 nano-farad (nF) capacitor. If the oscillator output is modulated by audio frequency of 5 kHz, which of the following frequencies doesn’t appear in the output AM?