Busy day. Only spent 30mins at the office. Daniel says that there is a multiswitch system in there. If you use a splitter, you will not have full functionality on a HD decoder. If you are watching a vertically polarized channel (like MNet), recording will fail on a horizontal channel (like Animal Planet). What is probably happening there (this is just a guess) causing the digital break-up, is that he is using a splitter which only handles frequencies 5-1000MHz. He needs to use one that can handle 5-2150MHz, with the power pass line to input #1... Check on the 2-way splitter for the specs.
If he wants full functionality, you would have to pay to get a second cable feed from the main system...