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

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

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.

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

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

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

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)

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

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

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

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

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