HumanTechnik lisa A-2471 Mode D'emploi page 11

Person call button
Pressing the person call button on
the RF lisa combi II causes a signal
to be triggered on every receiver
which is set to the same radio chan-
nel as the transmitter. The person call
button lamp lights up to indicate this.
This makes it possible to call people
who are in different rooms. Also, this
button can be used for checking the
system is functioning even when the
microphone cable is not connected.
Mains operation
You can also operate your RF lisa
combi II via the plug-in power supply
unit (A-2992xx). To connect the PSU,
insert the connector 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
optimum conditions.
The following conditions may result in
a reduced range:
- Signal transmission through buil-
ding structures or vegeta tion
- 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 surfa-
ces 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,
there 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 ra dio transmit-
ter, in order to achie ve the greatest
possible range from the radio trans-
mitter:
- 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
restricted by metallic shielding.
English 11