Toshiba RF Receiver for HDTV Presentation 11: 02/10/2005 Team: Josue Caballero, Brett DiCio, Daniel Hooper, Efosa Ojomo, George Sewell

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

Building the Antenna… 24cm of plastic faucet tubing from Home Depot 13.5cm of 12guage copper wire Roughly 20cm of 20guage copper wire an RF adapter (pl259 to bnc) A coax pl-259 connector

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

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

Cross section of Antenna

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

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

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

RF transformer

Next week Meet with Professor Cook tomorrow Research more on RF transformers Possibly build an RF transformer Test the RF transformer (dependent)

References merwork.pdf#search='rf%20transformershttp:// merwork.pdf#search='rf%20transformers Harris Electric Supply CO Inc