With satellite, you won't use the Mag's tuner (unless you also connect an antenna or cable feed), so you'll connect as shown in Sketch 4 here.
Then, recording from the STB or copying from a DVR will be as described here. See also TIPS farther down that page.Click the 1st link in my signature for a list of other help files.
Click the link in my Post #2 above, which gives info and instructions, incl. TIPS for DirecTV users on setting coordinated timer programs.
Your timer programs should show L1 as the source, so that's correct.
As I said above, your Mag cannot decrypt the sat signal so the tuner is useless (unless you also connect an indoor or outdoor antenna or a cable feed for extra channels).