The given diagram shows an FM transmitter. (a) What is the total multiplication

Question

The given diagram shows an FM transmitter.

(a) What is the total multiplication factor?

(b) What is the carrier rest frequency at the antenna?

(c) What is the deviation of the radiated signal?

(d) What is the % of modulation?

(e) What is the modulation index?

(f) How many sideband pairs are in the radiated signal?

(g) What is the bandwidth of the radiated signal?

(h) What is the input power to the final power amplifier?

(i) What is the output power?

(j) What is the efficiency of the final power amplifier?

(k) How much power is in the carrier?

(l) How much total power is in the sidebands?

(m) If not already at 100 % modulation, what level of input signal would cause 100 % modulation?

Explanation / Answer

(a) total multiplication factor = 2*3*3 =18

(b) carrier rest frequency at the antenna =1.97593*18 =35.56674 MHz

(c) deviation of the radiated signal = 18*4*215 = 15480 Hz

(d) % of modulation = 100

(e) modulation index = 1.07

(f) sideband pairs are in the radiated signal = 1

( because modulation index <5    so NBFM)

(g) bandwidth of the radiated signal = 2 fm =23.22 kHz

(h) input power to the final power amplifier = 8 Watt

(i) output power = 500 Watt

(j) efficiency of the final power amplifier

(k) power is in the carrier =191.84 Watt

(l) total power is in the sidebands = 308.16 watt

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