100
13. Transmission range
The transmission range in the open field, i.e. there is visual contact between transmitter and receiver, is 300 m under
optimal conditions. Walls and even reinforced steel structures can be penetrated but this reduces the range
accordingly.
A reduced transmission range can be due to the following factors:
• High frequency interferences of all sorts
• Any kind of housing or vegetation
• The distance of the transmitter or receiver to conducting surfaces or objects (also the human body or the ground)
influences the emission characteristics and thus the range.
• Broadband interferences in urban areas can reach levels that decrease the signal—to-noise ratio over the entire
frequency band thus reducing the range.
• Devices with neighbouring operation frequencies can equally influence the receiver.
• Poorly screened or openly operated computers can emit into the receiver and reduce the range.
Since local conditions vary from site to site, a definite range cannot be guaranteed.
However, normally in a detached house trouble-free operation is possible. 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.