The 311 has a Broadcom BCM3440 chip in the tuner. This chip can only output Mpeg2. It CAN be toggled to work QPSK or 8PSK. You don't have to believe me.... see what Broadcom says>>
Code:
https://www.broadcom.com/products/Satellite/HDTV-SDTV-Video,-Graphics,-and-Receiver-Products/BCM3440
Quote "The BCM3440 was specifically designed to work with the BCM4500" which is also used in the 311. Click on the highlighted 'BCM4500' and all you will see mentioned are Mpeg2 systems.
There should soon be a firmware update for the 311 (and other OEM boxes that use the BCM3440/BCM4500 chips) and then all transponders will be 8QPSK (Turbo) That will eliminate a lot of the older FTA boxes.