Using OBi100(US) in HongKong, got humming background noise

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sailing:
The noise is coming through the power supply but it is only an issue when the Obi is connected to the house phone wires and those wires cross the power lines. A linear power supply should solve the problem but make sure its output is regulated.

I had posted what the problem is at https://www.obitalk.com/forum/index.php?topic=367.30;wap2. Only the last post of that thread is important and answers the question.

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