Plex and analog

Heres my problem.

I have an xbox one usb tv tuner and the cable line coming from my cable provider. When i run channel scan through the win tv app it picks up all the channels my tv would . This includes qam, and analog. the plex software doesnt include the analog channels which include espn, tbs etc. Why is this? also is there anyway to just manually tune channel i.e 2.1 instead of picking a show?

Jay