HumanTechnik Lisa Mode D'emploi page 11

Transmission signal detection
The acoustic RF receiver converts the sig-
nals sent by the lisa RF transmitter into the
different sounds (telephone ringing, door-
bell, baby cries, etc.).
At the same time, it is also possible to see
which lisa signal has been sent because the
corresponding LED will either flash or light
up for 40 seconds.
Telephone: Telephone LED lights up in oran-
ge and you can hear the sound of a telepho-
ne ringing.
Door I: Door LED lights up in green and you
can hear the sound of a doorbell.
Door II: Door LED flashes in green and you
can hear the sound of a different doorbell to
the first one.
Babycall: Babymonitor LED lights up in white
and you can hear the sound of a baby crying.
Person call: Person call LED lights up in yel-
low and you can hear the pager signal.
Alarm: All 6 LEDs flash and you can hear an
alarm signal.
Water alarm: Water-alarm LED lights up in
blue and you can hear an alarm signal.
Fire alarm: Fire-alarm LED lights up in red
and you can hear an alarm signal.
Transmission range
Note the following points when using the
acoustic RF receiver:
The radio signals are designed to have a
range of 80 meters under optimum condi-
tions. The following conditions may result in
a reduced range:
- Signal transmission through building
structures or vegetation.
- Interference from TVs, computer monitors
and mobile phones. Under certain circum-
stances, this may prevent the receiver
from functioning at all.
- Positioning of the transmitter at an un-
favourable distance from surfaces which
reflect radio waves, for example floors and
walls. This may lead to the signal wave be-
ing weakened 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.
- Having units operating at similar frequen-
cies located close to one another may also
result in mutual interference.
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