1- An FM modulator has a carrier frequency of 200 MHz, is frequency modulated by a sine wave signal at a frequency of (fm= 15 kHz). The resultant FM signal has a frequency deviation of (f= 45 kHz). 1. Find the carrier frequency swing of the FM signal. 2. Determine the highest and lowest carrier frequencies. 3. Calculate the modulation index for the wave? 4. Sketch, approximately to scale, the magnitude spectrum of the modulator output. Show all frequencies of interest. 5. Calculate the bandwidth occupied by this FM signal?

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%VE 11₁. 1₁. H+
1. Find the carrier frequency swing of the FM signal.
2. Determine the highest and lowest carrier frequencies.
3. Calculate the modulation index for the wave?
1- An FM modulator has a carrier frequency of 200 MHz, is frequency modulated by a sine wave
signal at a frequency of (fm= 15 kHz). The resultant FM signal has a frequency deviation of (f=
45 kHz).
4. Sketch, approximately to scale, the magnitude spectrum
Show all frequencies of interest.
5. Calculate the bandwidth occupied by this FM signal?
- 0 ۱۱:۳۸
Untitled
|||
2- An FM modulator uses a carrier frequency of 1000 Hz and a frequency sensitivity constant Kf =
12.5 Hz/volt. The message is m(t) = 4 cos 2710 t.
O
the modulator output.
1. What is the modulation index?
2. Sketch the magnitude spectrum of the modulator output. Show all frequencies.
3. Is this narrow band FM? Why?
•N
خ
11:+V
·K
मं
Transcribed Image Text:%VE 11₁. 1₁. H+ 1. Find the carrier frequency swing of the FM signal. 2. Determine the highest and lowest carrier frequencies. 3. Calculate the modulation index for the wave? 1- An FM modulator has a carrier frequency of 200 MHz, is frequency modulated by a sine wave signal at a frequency of (fm= 15 kHz). The resultant FM signal has a frequency deviation of (f= 45 kHz). 4. Sketch, approximately to scale, the magnitude spectrum Show all frequencies of interest. 5. Calculate the bandwidth occupied by this FM signal? - 0 ۱۱:۳۸ Untitled ||| 2- An FM modulator uses a carrier frequency of 1000 Hz and a frequency sensitivity constant Kf = 12.5 Hz/volt. The message is m(t) = 4 cos 2710 t. O the modulator output. 1. What is the modulation index? 2. Sketch the magnitude spectrum of the modulator output. Show all frequencies. 3. Is this narrow band FM? Why? •N خ 11:+V ·K मं
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