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13. Range

The transmission range of the radio signals between outdoor sensors and base station is up to 100m
under optimum conditions. This is often also called "free field range".
However, this ideal arrangement (eg base station and outdoor sensor on a plain, even
meadow without trees, houses etc.) never exists in practice.
Normally, the base station is set up in the house, the outdoor sensor for temperature/air humidity is
located outside next to the window and the UV sensor sideways on a house wall.
The range can sometimes be considerably reduced due to:
• Walls, reinforced concrete ceilings
• Coated/metallized insulation glazing
• Vehicles
• Trees, bushes, earth, rocks
• Proximity to metal & conducting objects (eg radiators)
• Proximity to human body
• Broadband interferences, eg in residential areas (DECT telephones, mobiles, radio-controlled
headphones, radio-controlled speakers, other radio-controlled weather stations, babyphone etc.)
• Proximity to electric motors, transformers, power-supply units, computers
• Proximity to badly shielded or openly operated computers or other electric devices
Since local conditions are different at every location site, a definite range cannot be
guaranteed.
However, normally trouble-free operation is possible in a detached house. When the base
station doesn't receive any data from the sensors (despite new batteries), reduce the
distance between the outdoor sensors and base station, change the installation site.
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