toshiba rf receiver for hdtv presentation 11: 02/10/2005 team: josue caballero, brett dicio, daniel...
TRANSCRIPT
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Toshiba RF Receiver for HDTVPresentation 11: 02/10/2005
Team:Josue Caballero, Brett DiCio, Daniel Hooper,
Efosa Ojomo, George Sewell
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Last week
• Finished buying equipment for Pringles Can Antenna (PCA) and Receiving Antenna
• Built the receiving antenna
• Might not build the PCA
• Found out information on getting reimbursed (Susan Adams)
• Electrical Supply Store
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Building the Antenna…
• 24cm of plastic faucet tubing from Home Depot
• 13.5cm of 12guage copper wire
• Roughly 20cm of 20guage copper wirean RF adapter (pl259 to bnc)
• A coax pl-259 connector
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Building the Antenna contd…
• Soldered the raw 12gauge wire to the pl-259 connector
• Pulled the 20gauge wire through the bottom and soldered it to the end of the 12 gauge wire
• Pulled the 20gauge out through the top hole and made 4 turns for UHF antenna and 18 turns for VHF
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Testing
• No increase in UHF signal strength of reception
• Increase in VHF signal strength of reception
• Antenna was longer than Toshiba’s
• Conclusion: The design was not worth it based on results
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Cross section of Antenna
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Factory Antenna
• Tested factory antenna at 180 degrees
• Lab notebook has vertical and horizontal testing
• Factory antenna is about 20dBuV stronger
• Don’t know what contributes to this
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Another consideration
• Finding an antenna with the required bandwidth and size is proving difficult
• Considering an RF transformer instead of an antenna– Prof. Cook & Doc. Watai both recommend
• Have halted antenna design endeavors and have begun researching RF transformers
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RF Transformers
• Devices that transfer energy from one circuit to another by electromagnetic induction
• Very short range
• Used for impedance matching to achieve maximum power transfer
• Used to suppress undesired signal reflection
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RF transformer
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Next week
• Meet with Professor Cook tomorrow
• Research more on RF transformers
• Possibly build an RF transformer
• Test the RF transformer (dependent)
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References
• http://www.minicircuits.com/appnote/howxfmerwork.pdf#search='rf%20transformers
• Harris Electric Supply CO Inc