I will explain general about radio outdoor unit, the odu houses the interface towards the IDU on one side, and towards the antenna flange on the other.
The odu shifts the incoming QAM-modulated carrier to RF frequency through a double conversion. The opposite occurs at the receive side, when the IF-converted carrier is sent to the IDU demodulator.
Antenna coupling in 1+1 system is done through abalanced or unbalanced hybrid.
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