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Your electric meter damps the signal enormously and represents a natural barrier to your neighbour. However, if you have unfavourably lying power supply lines it is possible that your neighbour benefits from an unmeant phase coupling. We absolutely advise you to use the internal device encryption! Entering a password which differs from the factory default will activate the encryption.
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I think that they're talking crap here. AFAIK the meter doesn't normally contain anything that would 'damp the signal'. I think that they really rely on the noise floor being so high that the signal is lost after a 100m or so of cable.