TechniSat DIGITRADIO 231 OD Manual page 103

> Insert the adapter plate into the DIGITRADIO 231 OD as far as it will go (2). Fold
up the two securing lugs (3) and hand-tighten the screws.
As soon as an auxiliary battery (charged) is plugged in, power is supplied via the
auxiliary battery. If the auxiliary battery is flat, power is supplied by the internal
battery.
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