# Electronics Engg. Technician

Words 548
Pages 3
Humber College

School of Applied Technology Tutorial 3 ELIC 220 September 22, 2014

ELIC 220- Communication Circuits

Questions: 1. 2. 3. 4. 5. 6. 7. Define angle modulation and list its subcategories What is the difference between frequency and phase modulation? What are the merits of an FM communications system compared to an AM system? What is FM undesirable in the standard AM broadcast band? What advantage does FM have over AM and SSB? Define derivation constant? A 50 – mV sinusoid, at a frequency of 1 kHz, is applied to a capacitor microphone FM generator. If the deviation constant for the capacitor microphone FM generator is 500 Hz/20mV, determine a. The total frequency deviation b. The rate at which the carrier frequency is being deviated In an FM transmitter, the output is changing between 90.001 and 89.999 MHz 1000 times a second. The intelligence signal amplitude is 3 V, determine the carrier frequency and intelligence signal frequency. If the output deviation changes to between 90.0015 and 89.9985 MHz, calculate the intelligence signal amplitude. What determines the rate of frequency swing for an FM broadcast transmitter. Define modulation index (mf) as applied to an FM system. What characteristic(s) of an audio tone determines the percentage of modulation of an FM broadcast transmitter? Explain what happens to the carrier in FM as mf goes from 0 to 15. Calculate the bandwidth of an FM system (using Table 3-1) when the maximum deviation (������) is 15 kHz and fi = 3 kHz. Repeat for fi =2.5 and 5 kHz. What frequency swing is defined as 100% modulation for an FM broadcast station? What is the frequency swing of an FM broadcast transmitter when modulated 60%. An FM broadcast transmitter is modulated 50% by a 7- kHz test tone. When the frequency of the test tone is changed to 5 kHz and the percentage of modulation is unchanged, w hat is the transmitter...

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