Toshiba RF Receiver for HDTVToshiba RF Receiver for HDTV

Presentation 10: 02/10/2005Presentation 10: 02/10/2005Team:

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

Antenna ConstructionAntenna Construction

Currently built factory replica*Currently built factory replica*• Bent torroid, unpredictable• Receiving antenna built from picture

Contacted Aaron, he is sending their antennaContacted Aaron, he is sending their antenna Found design for combination UHF/VHF reciever Found design for combination UHF/VHF reciever

antennaantenna• Crude design• Overwhelming signal• Parts – Wire is hard to find...

Discone AntennaDiscone Antenna

Discone antenna Discone antenna meets several meets several requirementsrequirements• Reliable?*• 50Mhz design is 3-4ft• Requires large

material Copper sheeting = $$Copper sheeting = $$

EZNECEZNEC

Antenna Modeling SoftwareAntenna Modeling Softwarehttp://http://www.eznec.comwww.eznec.com//

… … demonstration using demo …demonstration using demo …

Test TableTest Table

Complete Test SetupComplete Test Setup

Brett Tests an AntennaBrett Tests an Antenna

Shielding?Shielding? Current total power levels not Current total power levels not

exceeding 2 microwattsexceeding 2 microwatts Signals barely extend to edge of test Signals barely extend to edge of test

tabletable Amplification neededAmplification needed

Stuff to doStuff to do Meet with LasonMeet with Lason

• Radiation pattern• Options

Meet with CookMeet with Cook• Combination Antenna• Discriminating transmission design

Repeat testingRepeat testing More testingMore testing

ResourcesResources

http://www.northcountryradio.com/Artihttp://www.northcountryradio.com/Articles/discone.htmcles/discone.htm