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SMA Solar Technology AG Basics for the Planning of a Bluetooth PV System 4.1.2 Penetration of Obstacles The longer the distance is that the radio signals have to cover when penetrating an obstacle, the more are the radio signals dampened by the obstacle. The distance depends on the obstacle's thickness and whether the obstacle is penetrated straightly or at an angle. The thicker an obstacle, the longer is the distance which the radio signals have to cover during penetration of obstacles. Straight penetration If the radio signals can straightly penetrate a wall, for example, then the distance through the wall is shorter and therefore the damping of the radio signals is lower. Penetration at an angle If the radio signals have to penetrate a wall at an angle, for example, to get from device to the other, the distance through the wall is further and therefore the damping is greater than with radio signals that straightly penetrate the wall. Technical Description BT-TUS092210 21