Call Button; Mains Operation - HumanTechnik lisa Mode D'emploi

Call button

Pressing the call button on the RF
telephone transmitter acoustic cau-
ses 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 indi-
cate this. This makes it possible to
call people who are in different
rooms. This button can also be used
to check, if the system is working,
even when the microphone is not
connected.

Mains operation

You can also operate your RF tele-
phone transmitter acoustic via the
plug-in power supply unit. To connect
the PSU, insert the connector on the
end of the PSU cable into the corre-
sponding 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 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 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 RF transmitter
Bear in mind the following points when
positioning the RF transmitter, in order
to achieve the greatest possible range
from the RF transmitter:
- The RF transmitter should not be
set up close to devices which emit
powerful interference signals, such
as TVs, computer monitors or mobi-
le phones.
- The RF transmitter should not be
placed on metallic objects, since
otherwise the radio range will be
restricted by metallic shielding.
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