sequential (31) no realistic serial circuit -FM Modulation (2)

 https://wodewangzhishime.blogspot.com/2022/07/cai-yourong-spy.html

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Ref: https://chihaukam.blogspot.com/2025/09/blog-post.html?m=1

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John: There're 2 pictures above. Which one is correct.

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Me: The 2nd picture is correct.

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John: You're wrong. The 1st picture is correct.

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Me: Why?

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John: There's a circuit in the 1st picture.  This circuit is called Circuit A. In circuit A, the frequency is strange and unbalance. The left-side branch is 90Mhz. However, the right-side branch is 100Mhz. Because, the right-side branch is 100Mhz. As a result, a electrical current of 100Mhz is induced in Circuit B. And then, it is horrible.

Me: Why?

John: Read the followings.

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1) The resonance frequency of circuit A is 80Mhz. (fc = 80) <---- fc stand for central frequency.

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2) The resonance frequency of cirucit B is 100Mhz. (fc + deviation = 100)

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John: If an electrical current of 100 Mhz is induced in Circuit B,  indeed, between the inductor and capacitor of circuit B, the current is just resonance. Parallel resonance is "extremely high resistance". As a result, the current can't enter terminal B.

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if (terminal B = disabled)

{

terminal A = enable.

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John: As a result, the electrical current enter terminal A.