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Home Television Station

This project report details the journey of constructing a TV transmitter, emphasizing the hands-on RF design experience. The transmitter includes components like RF oscillators, amplifiers, and modulation circuits for video and audio inputs. Key challenges such as sourcing parts, audio noise, and video distortion are discussed. The project emphasizes the importance of teamwork, time management, and thorough research in the design process. The total cost of the project amounted to $7,040, highlighting the complexity and labor intensity in the creation of the transmitter.

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Home Television Station

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Presentation Transcript

  1. Home Television Station By Hung Nguyen Khoi Nguyen ECE345 Representation Group 9 TA: Purvesh Thakker

  2. Why build a TV transmitter • Want to have RF design experience • Home security • Entertainment

  3. TelevisionTransmitter

  4. Top View of Transmitter

  5. Block Diagram of Transmitter

  6. Side View of Transmitter Video Input RF Oscillator RF Amplifier To Antenna Video gain Modulator Audio Input Subcarrier Oscillator & FM Modulator

  7. Colpitts Oscillator Frequency controlled by C1,C2, and L1

  8. Hartley Oscillator Frequency controlled by C2 and IF transformer

  9. Spectrum of transmitter without input signals Carrier Frequency Second harmonic Third harmonic Forth harmonic

  10. Spectrum of modulated signals Where are the chrominance subcarrier, the horizontal spectrum and the vertical spectrum??? Sound carrier Picture Carrier Carrier Frequency

  11. Problems Encountered • Searching for parts • Noise in Audio background & Video distortion • Time consume • Many more factors need to be considered in our design

  12. Conclusions What we learned: • Time Management • Teamwork • Research plays a big role in design process

  13. Final Costs • Parts: $40 • Labors: $7,000 • Total: $7,040

  14. Suggestion?

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