a) A block diagram of an indirect (Armstrong) frequency modulation (FM) transmitter is shown in below. Let fi-100KHz, and the frequency deviation Af=10HZ at the input of this indirect transmitter, and the local frequency is ft.-8.5MHz. Evaluate ni and n2 to obtain a carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator. m(1) NBFM f₁ A/₁ Frequency multiplier XA₁ راد /LO LPF h Frequency multiplier X n₂ le

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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 ft.-8.5MHz. Evaluate ni and nz to obtain a
carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator.
m(1)
NBFM
A/₁
Frequency
multiplier
x ₁
T
/2
راد
~/LO
LPF
/
Frequency
multiplier
x ₂
Se
ره
4,(1)
Transcribed Image Text: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 ft.-8.5MHz. Evaluate ni and nz to obtain a carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator. m(1) NBFM A/₁ Frequency multiplier x ₁ T /2 راد ~/LO LPF / Frequency multiplier x ₂ Se ره 4,(1)
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