Some television stations in the Otway and far south-west areas will shift frequencies, meaning viewers will have to retune their digital televisions, set-top boxes and digital recorders. 

The process is part of a national program that will free up the broadcasting spectrum for new services such as mobile broadband. 

The date viewers will need to retune will depend on which transmission tower they receive their signal from. 

Viewers in Casterton, Terang, Timboon and Cobden will need to retune after 3.30pm on September 17, while for those in Portland the date is September 24. 

Retuning is done using the remote control’s menu button and looking for options like channels or auto-tuning. 

The Department of Communications said broadcast disruptions were likely in the days before and after the retune because of work at the transmission site. 

There is also likely to be disruptions to all TV services on the day of the retune. For more information go to www.retune.digitalready.gov.au