HumanTechnik Lisa A-240-90 Mode D'emploi page 21

The following conditions may result in a re-
duced range:
- Obstacles like building structures or vegetation.
- Interference from TVs, computer monitors and
mobile phones. Under certain circumstances,
these may prevent the receiver from function-
ing at all.
- Positioning of the transmitter at an unfa-
vourable distance from surfaces which re-
flect radio waves, for example floors and walls.
This may lead to the signal wave being weak-
ened or even cancelled out by the reflected
wave.
- Metallic objects reduce the range due to the
shielding effect of the metal.
- Particularly in towns and cities, there may be
many other sources of radio waves which can
disrupt the original signal.
- Other devices operating at similar frequencies
in the vicinity may also result in mutual inter-
ference.
English 21