•
Fire-safety walls, elevator shafts, staircases and supply areas should be
considered as screening
.
Other factors restricting transmission range:
•
Switch mounted on metal surfaces (up to 30% loss of transmission range)
•
Hollow lightweight walls filled with insulating wool on metal foil
•
False ceilings with panels of metal or carbon fiber
•
Lead glass or glass with metal coating, steel furniture
•
Mounting transmitter or receiver on the floor, or close to the floor, or at
wall niches
•
Humidity in materials
•
Devices transmitting RF signals such as computers, audio and video
equipment, or electronic gear controls for lamps. A minimum distance of
0.5m should be kept
The angle at which the transmitted signal hits the wall is very important. The effective wall
thickness – and with it the signal attenuation – varies according to this angle. Signals should
be transmitted as directly as possible through the wall. Wall niches should be avoided.
Figures 10 and 11: Obstacles reducing the transmission range
Please note: 868 MHz frequency range is used by Trunk Radio in the US. Since a clear
reduction of transmission range is to be expected near to trunk radio stations, range
tests at the system’s target location should categorically be performed before
notification of a particular range in the US and Canada!
©EnOcean GmbH, A. Anders
Page 15 of 18
RCM 255 User Manual V1.12
