Q11
a(ii)A sinusoidal carrier wave has frequency 500 kHz and amplitude 6.0 V. It is to be
frequency modulated by a sinusoidal wave of frequency 8 kHz and amplitude 1.5 V.
The frequency deviation of the carrier wave is 20 kHz V^–1
Describe, for the carrier wave, the variation (if any) of
1. the amplitude,
2. the frequency.
Answer:
1. Amplitude does not vary (I got this)
2. Upper limit 530kHz (I assume they got this by using 20kHz/V x 1.5V??)
Lower limit 470kHz
Changes from lower to higer and to lower limit at 8000 per second (I'm not sure how they got 8000/s??)
Please help?
Thankkkkkks :)
2 answers
The frequency of the wave by which the carrier wave is going to be modulated is 8KHz that's why it'll vary 8000 times per second
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