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6. System description
The base unit has a large LC display for displaying the indoor temperature,
time/date and the outdoor temperature measured and transmitted by the
remote sensor. The base unit supports up to three remote sensors (one
included).
You do not need to install any wires due to radio transmission from remote
sensor to base unit (433 MHz technology) which simplifies the installation and
offers you additional options. You can install, as an example, one remote
sensor in the carport, the other one in the heating room and the third one can
measure and transmit the temperature from your storage room.
The base unit can store the maximum and minimum temperature.
In addition, there is an integrated temperature trend display for indicating the
temperature measured by the remote sensor.
The clock and calendar are radio-controlled. They automatically synchronize
the current time and date with radio signals received from ("DCF77") Frankfurt
on the Main (Germany), when within a maximum radius of approx. 1500 km.
You can also set the clock and calendar manually when not within the range of
the DCF transmitter.
The weekday display is available in 5 languages: English, German, Spanish,
French, Italian.
In addition, the base unit is equipped with two different alarm functions (single
alarm and weekday alarm, Monday to Friday).
The base unit can be wall-mounted (there is a mounting hole on the rear of the
unit) or placed on a flat surface by means of the included table stand.
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10. Ranges and radio interference
• The radio transmission from the base unit to the remote sensor is possible
in the range of 433 MHz, also used by other devices. This can affect the
range and operation of the unit.
• The specified range of 30 m is a free field range, i. e., a range within a line-
of-sight contact between the remote sensor and the base unit. But in
practice, walls, ceilings etc. between the transmitter and receiver may affect
and reduce the range.
Other causes for reduced range:
• Any radio frequency interference
• Any housing and vegetation
• Conductive metal parts which are located near the units or within or near
their transmission path, e. g. heaters, metallized insulation glass windows,
reinforced concrete ceilings etc.
• Influence on the radiation pattern of antennas caused by the distance from
the remote sensor and base unit to conductive surfaces or objects (to
human bodies or ground also)
• Broadband interference in urban areas which reduces the signal-to-noise-
ratio; the signal will not be recognized due to this "noise"
• Interference radiation resulting from insufficiently shielded electronics, e. g.
open computers or the like
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