WDEF-TV is the call sign for the CBS affiliate in the Chattanooga, Tennessee market. It broadcasts on digital channel 12. Its analog 12 was shut off on February 17, 2009. WDEF's subcarrier, 12.2 is high definition.
WDEF has primarily been a CBS affiliate since its inception. It had secondary with DuMont (until it went dark in 1955), NBC (sharing with WROM/channel 9 to 1956, when WRGP/channel 3 signed on--now WRCB) and ABC (to 1958, when WROM moved to Chattanooga and changed its call to WTVC, the current ABC affiliate). They picked up secondary affiliation with UPN in 2004. It ended in 2006 after UPN and the WB (then on WFLI/channel 53) shut down and merged into the CW.
WDEF's digital signal went on the air in 1999 on channel 47. Upon switching off its analog signal, it moved to its post-shutoff selection, channel 12.
|12.1||12.1||WDEF-DT||Main WDEF (CBS)|
Current CBS Prime-Time Schedule
|Monday||Prime News at 7||The Andy Griffith Show||The Big Bang Theory||Kevin Can Wait||2 Broke Girls||The Odd Couple||Scorpion||News 12 Nightside|
|Tuesday||Prime News at 7||The Andy Griffith Show||NCIS||Bull||NCIS: New Orleans||News 12 Nightside|
|Wednesday||Prime News at 7||The Andy Griffith Show||Survivor||Criminal Minds||Code Black||News 12 Nightside|
|Thursday||Prime News at 7||The Andy Griffith Show||NFL Thursday Night Kickoff||Thursday Night Football||News 12 Nightside|
|Friday||Prime News at 7||The Andy Griffith Show||MacGyver||Hawaii Five-0||Blue Bloods||News 12 Nightside|
|Saturday||Paid programming||Crimetime Saturday||48 Hours Mystery||News 12 Nightside|
|Sunday||60 Minutes||NCIS: Los Angeles||Madam Secretary||Elementary||News 12 Nightside|