NORTH West residents it's time to retune.
Television channels across the North West Slopes and Plains and Armidale will change frequencies today to free up the broadcasting spectrum for new services, including mobile broadband.
This retune affects viewers in Armidale, Gunnedah, Warialda, Manilla, Boggabri, Mungindi, Narrabri, Moree, Quirindi, Wee Waa and Tamworth.
Once the channels have moved, viewers will need to retune their digital TV, set-top box or digital TV recorder to get them back.
Harvey Norman Tamworth electrical franchisee Cherie Stanton said while the retuning process was simple, she was expecting "aftershocks" today.
"I think most people are probably unaware," Ms Stanton said.
"There might be a bit of shock when it actually happens.
"It's pretty simple to retune, but if people have multiple devices it could make things a bit more confusing."
Retuning is done using the remote control and for most systems, viewers should press the "menu" button on the remote, look for settings such as "channels" or "auto-tuning", then follow the prompts to retune.
Viewers might want to write down their favourite channels, program recordings or parental lock settings before they retune.
Walcha residents will be required to retune their televisions later in the year, while North Armidale retuned earlier this year.
Authorities say TV services could be interrupted for "several hours" during the process and there might also be outages to all TV services over the next day.
Viewers who are having difficulty retuning their equipment should check their manufacturer's handbook or manual for instructions on how to retune, ask a friend or family member to help, visit the retune website, or call the Digital Ready Information Line on 1800 201 013.