HumanTechnik lisa A24640 Mode D'emploi page 11

Call button
Pressing the call button on the Radio
Telephone Transmitter - Acoustic
causes a signal to be triggered on
every receiver which is set to the
same radio channel as the transmit-
ter. The 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 functio-
ning even when the microphone
cable is not connected.
Mains operation
You can also operate your Radio
Telephone Transmitter - Acoustic via
the plug-in power supply unit. 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 nor-
mal 230 V socket in your house.
Radio range
Note the following points when
using the Radio Telephone Transmit-
ter - Acoustic:
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 vegetation
- Interference from TVs, computer
monitors and mobile phones.
Under certain circumstances, this
may prevent the receiver from
functioning 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 radio transmit-
ter, in order to achieve the greatest
possible range from the radio trans-
mitter:
- The radio transmitter should
not be set up close to devi-
ces which emit powerful
interference signals, such as
TVs, computer monitors or
mobile phones.
English 11