Kathrein Twin-PVR Satellite UFS 821si - Manual (Page 88)

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Antenna Setup
Installation Menu
Use the  buttons to select whether you want to use only tuner 1
(single mode) or both tuners (dual mode). In dual mode (both tuners
receiving a dedicated signal or the signal from tuner 1 is looped-through
to tuner 2) a SAT IF signal must be connected to both tuners.
First Installation
See “First Installation” section.
Only make changes to this menu when settings or circumstances
on/relating to your reception system have changed. You made
the settings for the antenna during first installation. The settings
should be made by a specialist engineer.