Toshiba RF Receiver for HDTV

1
Toshiba RF Receiver for HDTV

• Presentation 11 02/10/2005

Team Josue Caballero, Brett DiCio, Daniel
Hooper, Efosa Ojomo, George Sewell
2
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

3
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

4
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

5
Testing

• No increase in UHF signal strength of reception
• Increase in VHF signal strength of reception
• Antenna was longer than Toshibas
• Conclusion The design was not worth it based on
  results

6
Cross section of Antenna
7
Factory Antenna

• Tested factory antenna at 180 degrees
• Lab notebook has vertical and horizontal testing
• Factory antenna is about 20dBuV stronger
• Dont know what contributes to this

8
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

9
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

10
RF transformer
11
Next week

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

12
References

• http//www.minicircuits.com/appnote/howxfmerwork.p
  dfsearch'rf20transformers
• Harris Electric Supply CO Inc