recording another program while watching another can deteriorate picture quality,Is it true or not please confirm to me.The bandwidth is divided in 2 parts which reduces the picture quality.
The STB has two tuners, the LNB has two and two cables run from dish to STB. So the two channels tuned or viewed or virtually independent. But as two channels can be recorded and one recorded channel can be viewed simultaneously, the stb must have a high speed disc and sufficient buffer. To evaluate recording quality, one must watch a channel and record it at the same time, and then watch the recorded version.