Question

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

using two step multiplier where the message signal 𝑚(𝑡) 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(𝑡) is lowered by amount of 𝜔2.

In other words, two multipliers are separated by mixer. Find multiplier values 𝑚1 and 𝑚2

with 𝜔1 = 100 𝑘𝐻𝑧 and 𝜔2 = 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.

Answer 1

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