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13. Transmission Range

The transmission range of the radio signals between outdoor sensor 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 and the outdoor sensor for temperature/air
humidity is mounted outside, next to the window.
The range can sometimes be considerably reduced due to:
• Walls, reinforced concrete ceilings
• Coated/moralized insulation glazing
• Vehicles
• Trees, bushes, earth, rocks
• Proximity to metall & 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 transmission
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 one or several sensors (despite
new batteries), reduce the distance between the outdoor sensor(s) and base
station, change the installation site.
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