Welcome to the forum.
Unlike recording from analogue terrestrial TV or Cable, Digital satellite receivers decode the tuned in channel and output it on a single broadcast frequency, when in your case happens to be channel 3. As agentcoooper and Wesley mentioned above, your DVD recorder would need some way of changing the channel on your satellite receiver such that it can record from the correct satellite channel. While I seen some VCRs have the ability to output an IR signal to change the channel on the satellite receiver, from what I'm aware of, the LiteOn DVD recorder series does not offer this capability, at least the LVW-5045 model I have. :rolleyes:
One way around this is to set up a timer on your satellite receiver itself, assuming your satellite receiver supports this. If it does, set it such that it changes to the correct channel and also matches the timer on the DVD recorder. For example, if you want to record from CNN from 7pm to 7:30pm and MTV from 8pm to 8:30pm, first set up a timer on your satellite receiver to turn on CNN from 6:55pm to 7:35pm (I usually add 5 minutes to avoid early/late startings), set up another to turn on MTV from 7:55pm to 8:35pm and finally set these same timers on your DVD recorder to record from channel 3 (where the satellite TV channel tunes on).
Unfortunately, as a satellite receiver can only tune in one channel at a given time, it is not possible to record one channel while watching another. The only exception I'm aware of is the TiVo / PVR based receivers which have two feeds (coaxial cables) from the satellite dish.
Finally, I would seriously recommend connecting your satellite receiver to your DVD recorder using SVHS (US model) or SCART (EU model) along with a twin RCA/Phono cable for the audio as this will ensure you get a stereo audio recording and a better picture.