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Toshiba RF Receiver for HDTV

Toshiba RF Receiver for HDTV. Team: Josue Caballero, Brett DiCio, Daniel Hooper, Efosa Ojomo, George Sewell. Presentation 4: 11/11/2004. Work Accomplished in the Past Week. Broke down our project into problem areas Defined the environment in which our project is operating Inputs Output

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Toshiba RF Receiver for HDTV

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  1. Toshiba RF Receiver for HDTV Team: Josue Caballero, Brett DiCio, Daniel Hooper, Efosa Ojomo, George Sewell Presentation 4: 11/11/2004

  2. Work Accomplished in the Past Week • Broke down our project into problem areas • Defined the environment in which our project is operating • Inputs • Output • Developed more questions for our sponsor

  3. Goal of the Project • Design a cost efficient wireless system • Transmits factory generated signals to be received at specified signal strength (ex. 40/65/>85 μ dB) • UHF: Ultra High Frequency • VHF: Very High Frequency • CATV: Cable Television • ATSC: Advanced Telecommunications Standards Committee • QAM: Quadrature Amplitude Modulation • The operational frequency range should be between 55.25 and 805.75 MHz.

  4. Problem Statement • Coaxial cable to be attached to the television’s tuner/RF switch • Cable can fall off, damaging assembly line or TV, incurring repair costs • Cable becomes damaged with use, needing replacement • Damaged cable can cause TV rejection, affecting productivity

  5. Externals – Source • UHF/VHF/CATV using ATSC/QAM • Feed is on coax • The feed is controllable • Signal – Test pattern* • Strength – Adjustable throughout factory • *Question: Test signals on one or multiple frequencies Full chart can be found at http://www.ntia.doc.gov/osmhome/allochrt.pdf

  6. Externals – Input • Input goes into cable tuner • dB spec is very specific • TV • V-Chip (Violence - Chip) • Closed Captioning (CC)

  7. Antenna - Transmitter • Goal - To change coax signal into radio frequency signal • Directionality • Less errant signals / strong gain • Bandwidth (55.25 – 805.75 Mhz, individual/multiple) • Gain • “Antenna gain is defined as the power output, in a particular direction, compared to ...any direction by a perfect omnidirectional antenna.” (Stallings, 109)

  8. Antenna - Reciever • Goal – Changes RF signal to coax line signal • Directionality – adjacent signal interferance • Bandwidth reception • Single/Multiple • Deviation – what can we work with

  9. Looking Forward • Design philosophy • Antenna design = “Black Magic” • Difficult to design and analyze mathematically • Graduate level EE courses • Solution: Iterative design process • Plan • Build • Test

  10. Iterative Design Process • Eliminates uncertainties that arise in the ‘real world’ • We will know when we are ‘getting close’ and when we are ‘there’ • Recommended by Dr. Fleetwood

  11. Next Week • Work out final questions about specification • Repeatability • Bandwidth • Will a tuned antenna work? • Is it necessary to cover the entire BW? (55.25-805.75 MHz) (5.4 – 0.37m) • Determine testing procedures

  12. References • http://www.bsjm.com.cn/04/images/mdsbxz.jpg • http://www.ntia.doc.gov/osmhome/allochrt.pdf • http://www.gpsw.co.uk/ProdImg/prod1875s.jpg • “Data and Computer Communications”, William Stallings, 2004 (C)Prentice Hall New Jersey pg. 109

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