Unit installation

WaveNet Radio Network 3065
Page 5
In the year 2000, a special SRD (short range device) band in the 868 MHz range was
made available for this type of application. The advantage of this new SRD band is
that a clear set of regulations governing utilisation periods per time unit has been
defined for the sub-bands. This means that a radio device (e.g. Router Node) which
utilises a frequency channel in the 868 MHz bandwidth is only permitted to transmit
for 36 seconds in every hour. This limitation is defined in what is known as the ‘duty
cycle conditions’.
This excludes permanent transmitters from the outset – and with them sources of
interference in secure radio transmission such as wireless headsets and amateur
radio enthusiasts. There are also wavelengths that are exclusively reserved for
security applications. With its basic information and specifications relating to system
technology such as size of components, minimum range, battery lifespan and so on,
the 868 MHz band represents a sufficiently secure transmission method for use in
WaveNet.
Technical implementation
Transmission
Encodin
g
Decodin
g
EvaluationData
Transmitter
Receiver