Toshiba RF Receiver for HDTV

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Toshiba RF Receiver for HDTV

• Presentation 13 02/24/2005

Team Josue Caballero, Brett DiCio, Daniel
Hooper, Efosa Ojomo, George Sewell
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Work Scheduled

• Obtain a spool of copper wire
• Build a test-transformer (basic design)
• Design a coupling transformer
• Test coupling transformer
• Research equations and methods for performing
  calculations on bandwidth
• Learn about tuning capacitors

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Work Accomplished

• Worked on mathematical model describing
  transformer system
• Built four test elements
• Tested elements in lab

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Mathematical Models

• Needed a way to describe each element so that
  certain goals could be achieved
• Inductance
• Bandwidth
• Flux Linkage
• Developed a simplified model based on a very
  short solenoid

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Solenoid Model

• A very short solenoid should have a self
  inductance similar to a wound wire loop.
• Lsolenoid (µ0) (N2) (A)/L
• Self inductance of a solenoid is equal to the
  permeability of free space times the number of
  turns squared times the cross-sectional area
  divided by the length of the solenoid.

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Why?

• Inductance of the element determines the
  frequencies that can pass through it. Too high
  and there will be no transmission in the UHF
  band.
• However, bandwidth is logarithmic, while
  inductance is linear (like resistance) SO, the
  more current is pushed through the inductive
  element, the wider the bandwidth.

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Solenoid Model Shortcomings

• The solenoid model is good, however it cannot
  tell us about the magnetic field outside itself
• This is important because we will need to
  determine variability based on position compared
  to the second (receiving) element.

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In the works

• Using the Biot-Savart Law, it is possible to find
  magnetic field density (in Teslas) of any point
  in space around a current loop.
• Using this magnetic field description, magnetic
  flux and coupling can be determined.

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For next week

• Further develop mathematical model
• Tweak experimental designs based on results
• Obtain better wire for experiments