HumanTechnik lisa Mode D'emploi page 11

Doorbell 2
To send a signal for Doorbell 2 to all
the receivers which are switched on,
set the signal selection switch to the
bottom position.
Call button
Pressing the call button on the radio
doorbell transmitter acoustic causes
a signal to be triggered on every
receiver, which is set to the same
radio channel as the transmitter.
The call button lamp lights up to in-
dicate this. This makes it possible to
call people who are in different rooms.
Also, this button can be used for che-
cking the system of its functioning
even when the microphone cable is
not connected.
Mains operation
You can also operate your radio door-
bell transmitter acoustic via the plug-
in power supply unit (A-2992-0). To
connect the PSU, insert the connec-
tor on the end of the PSU cable into
the corresponding socket on the left-
hand side of the device. Then plug
the power supply unit into the normal
230 V socket in your house.
Radio range
The radio signals are designed to
have a range of 80 meters under op-
timum conditions.The following condi-
tions may result in a reduced range:
- Signal transmission through buil-
ding structures or vegetation
- Interference from TVs, computer
monitors and mobile phones.
Under certain circumstances, this
may prevent the receiver from func-
tioning at all.
- Positioning of the transmitter at an
unfavourable distance from sur-
faces, which reflect radio waves,
for example floors and walls. This
may lead to the signal wave being
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, the-
re may be many other sources of
radio waves, which can disrupt the
original signal.
- Having units operating at similar
frequencies located close to one
another, may also result in mutual
interference.
Positioning the radio transmitter
Bear in mind the following points when
positioning the radio transmitter, in
order to achieve the greatest possible
range from the radio transmitter:
- The radio transmitter should not be
set up close to devices which emit
powerful interference signals, such
as TVs, computer monitors or mobi-
le phones.
- The radio transmitter should not be
placed on metallic objects, since
otherwise the radio range will be re-
stricted by metallic shielding.
English 11