My recollection of past Republican conventions is that the MSM anchors engage in a lot of chatter while a speaker is giving his or her speech so that the viewers can’t hear the speech. C-SPAN probably will let you hear the whole speech, unless they decide that the RNC is not newsworthy enough and show speeches from the 1976 conventions instead...or run an interview with the author of the latest book on white racism.
I am watching Trump speaking now, on youtube Right Side Broadcasting Network.