Answer to Question #282147 in Electrical Engineering for Waleed

Question #282147

a) Find multiplier values 𝑛1 and 𝑛2 in a indirect WBFM generator (the Armstrong method)



using two step multiplier where the message signal π‘š(𝑑) has bandwidth 500 Hz and



narrowband modulator has a modulation index 0.2 and carrier frequency 120 KHz.



The output frequency is to be 120 MHz with the modulation index of 720.



b) The output WBFM signal in (a) can also be generated by a variant of the Armstrong



method, as shown below, where carrier frequency of 𝑣3(𝑑) is lowered by amount of πœ”2.



In other words, two multipliers are separated by mixer. Find multiplier values π‘š1 and π‘š2



with πœ”1 = 100 π‘˜π»π‘§ and πœ”2 = 4 𝑀𝐻𝑧 .(Note: Here two BPFs that follow the frequency



multiplier are not shown)



c) Comment your results. Which generator is more practical? Justify your conclusion.

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