Data Sheet for Product

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Siemens QAX9x.4 – Wireless and battery-less room units with EnOcean interface CM2N1663en_04
Building Technologies 2015-12-23
Appendix: Radio signals
A radio signal's strength decreases with distance as it is sent in all directions. In
addition, other factors influence the radio signal strength.
Below are a few examples of interference and attenuating impact of different
materials.
1660Z06en
Receiver
Metal
Silent zone
Transmitter
Material:
Passage of radio
signals
Wood, gypsum,
uncoated glass
90...100%
Brick, pressboards
65...95%
Reinforced concrete
10...90%
Metal, aluminum
lamination
0...10%
Avoid under all circumstances to metallically
screen a room unit.
At the same time, avoid mounting on a metallic
surface.
Building materials as well as wall angles in particular influence the radio signal
range with the radio link. The greater the angle at which electromagnetic waves hit
a wall, the greater signal attenuation.
As a result, avoid flat angles and wall niches.
1660Z07en
Receiver
Transmitter
Receiver
Low attenuation
High attenuation
Examples: Radio signal
range
Passag
e
Visual contact:
In hallways
Up to 30 m
In halls
Up to 100 m
RIGIPS walls, dry
wood
Ca. 27 m
up to 30 m
Max. 5
walls
Brick walls, aerated
concrete
Ca. 19 m Max. 3
walls
Reinforced concrete
walls
Ca. 10 m
Max. 1
wall
Fire protection walls,
elevator shafts,
stairwells, supply
areas
The radio signal is
isolated
A white paper on range planning for EnOcean systems is available on the Internet.
Use either a search engine to locate the white paper or go the EnOcean homepage
at:
http://www.enocean.com/fileadmin/redaktion/pdf/white_paper/WP_RANGE_
PLANNING_Jun09_en.pdf
Radio signal range