a) A block diagram of an indirect (Armstrong) frequency modulation (FM) transmitter is shown in below. Let fi-100KHz, and the frequency deviation Afi=10HZ at the input of this indirect transmitter, and the local frequency is flo=8.5MHz. Evaluate ni and n2 to obtain a carrier frequency fe-100MHz and Af=75KHz at the output of this indirect FM modulator. x₂ (1) m(1) Frequency multiplier LPF NBFM Frequency multiplier x ₁ X n₂ f₁ A/₁ f₂ D/₂ fLO f3 Af

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Frequency Modulation

Frequency modulation is a method or process of encoding the data of a specific signal (analog or digital) by modulating the carrier wave frequency according to the frequency of the modulated signal. Modulated signals are nothing more than information or data that should be conveyed after being converted into electronic signals.