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lecture7 - EEE455 591 E EE455 Radi o and T V Br oadcasti ng...

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EEE455/ 591 EEE455/ 591 Radio and TV Broadcasting Radio and TV Broadcasting Reading: Textbook Sections 3.4 Reading: Textbook Sections 3.4 Topics: Topics: 1. AM Radio Broadcasting 2. FM Radio Broadcasting 3. TV Broadcasting (Black and White) 4. Color TV Broadcasting
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1. AM Radio Broadcasting Frequency allocation: 540-1600 kHz with 10 kHz spacing (about 100 channels). Conventional AM. Super-heterodyne AM receiver Intermediate Frequency (IF) at 455 KHz with f lo =f c +f if RF amplifier has larger bandwidth B RF < 2 f if High quality narrow pass-band IF amplifier
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2. FM Radio Broadcasting Frequency allocation: 88-108 kHz with 200 KHz spacing (about 100 channels). IF at 10.7 MHz with bandpass filter of 200 KHz bandwidth
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2. Stereo FM Radio Broadcasting Add left and right audio signals. Add pilot tone at 19 kHz instead of 38 kHz Find difference between left and right signal, encoded as DSB-SC AM Frequencies occupied in baseband are 0-15 kHz and 23-53 kHz.
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