3. What parameter of the intelligence signal causes or determines the rate of ca

Question

3. What parameter of the intelligence signal causes or determines the rate of carrier frequency deviation?



7. If you are tuned to an FM station at a frequency of 100.1 MHz, show the bandwidth allocation for two adjacent stations.


8. What is the required BW to transmit an FM signal if the maximum deviation is 60 KHz and intelligence frequency is 15 KHz?


9. Determine the power distribution in carrier and sidebands if the transmitted power is 1,000 W and mf = 1


10. Why is Preemphasis required?


11. What is the RC time constant required for Preemphasis circuits?



12. An FM transmitter delivers to a 75 ohm antenna a signal voltage of
V(t) = 1000 sin ( 109t + 4 sin 104t )
Determine:

(a) Carrier frequency
(b) Intelligence frequency
(c) Modulation index
(d) Total power in FM signal
(e) Carrier power
(f) Power in each side band






13. Why are RF amplifiers necessary in FM receivers?



14. What are the two functions of a Limiter?



15. What is the meaning of the term center frequency in reference to FM
broadcast?



16. What frequency swing is defined as 100 % modulation for an FM broadcast station?


17. Draw a block diagram for a Crossby FM transmitter for a transmitter frequency of 100.1 MHz.

Explanation / Answer

10) Pre-emphasis is a strong high frequency boost before the transmitter, and an equally strong high frequency attenuation in every radio..

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