TechniSat TECHNIRADIO 6 IR Instruction Manual page 118

If no station is saved in the selected station slot, [(empty)] appears on the
display.
Alternatively the respective one-touch button 1-4 can also be pressed.
9.2.6 Overwriting/deleting a station memory slot
> Simply save a new station in a favourite memory slot as described.
When retrieving the factory settings all memory slots are deleted.
9.2.7 Signal strength
> Press the INFO button repeatedly until the signal strength bar is displayed.
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