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Unfortunately, the Lite-On models do not offer input volume sensitivity, which means that connected equipment that either gives out an unusually low or high volume will result in a weak audio recording or audio clipping.
I would recommend checking if your satellite receiver box has a built-in volume control. For example, if there is a volume control on your satellite remote control, then start a test recording to DVD and adjust the volume way down and up. Now playback the recording to see if the volume varies in the recording. If so, then there is a good chance that the DVD recorder is hooked up to the wrong output of the satellite receiver (such as TV-Out instead of the other output).
However, if the the satellite’s volume control is not the issue or your satellite receiver does not have a volume control, the only other way of correcting the volume is through some sort of pre-amplifier.