Connect a DVD recorder to the satellite system much like you would a TV set. Most DVD recorders have a built-in tuner.
If you're trying to do this via computer, that's going to be tricky. I wouldn't do that without being able to do a lot of testing to make sure it's reliable.
I'd also caution about recording. While it is permitted for time-shifting purposes, use of the recording is very restricted. No other use, personal or church is permitted. (At least that was my interpretation of the letter sent to the stake presidents.)
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