https://www.volvocars.com/my/support/car/s80/14w46/article/5f89cc41e21df1e1c0a801e8006aba6d/0d827e254ad864f3c0a801e80015b636/eb49514040a3403bc0a801e801a5868f/
Volvo Support for S80 Digital radio (DAB) - subchannel | Secondary components are usually named subchannels. These are temporary and can contain e.g....
digital radio dabsubchannelvolvosupport
https://www.tvtechnology.com/miscellaneous/sinclair-broadcast-group-launches-dtv-subchannel-at-wbff
VertigoXmedia's Xstation will provide automation and media playout for a new channel airing on WBFF's secondary DTV spectrum
sinclair broadcast grouptv techlaunchesdtvsubchannel