User Manual

ZE51/61-2.4 RF Module User Guide
1VV0300868 Rev.4 – 31/03/2011
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 9 of 50
CHAPTER II. REQUIREMENTS
II.1. Regulations requirements
The ZE51/61-2.4 module is a [1],[2],[6],[7] compliant multi channel radio modem in the 2.4GHz band (unlicensed
frequency band).
Europe Regulation:
The “ERC recommendation 70-03” [2] describes the limits band in the 2.4GHz license free band, in terms of bandwidth,
maximum power, duty cycle, channel spacing and type of application. It gives the following limitations:
Class Frequency
band
Maximum radiated power Channel
spacing
Duty cycle Notes
Annex 1h
(Non-Specific
Short range
Devices)
2400 – 2483.5
MHz
10 mW e.i.r.p.
No channel
spacing
specified
No
restriction
Annex 3a
(Wideband Data
Transmission
systems)
2400 – 2483.5
MHz
100 mW e.i.r.p. and 100
mW/100 kHz e.i.r.p. density
applies when frequency
hopping modulation is used,
10 mW/MHz e.i.r.p. density
applies when other types of
modulation are used.(*)(**)
No channel
spacing
specified.
No
restriction
For wide band
modulations other than
FHSS, the maximum
e.i.r.p. density is limited
to 10 mW/MHz
(*)Compliant to the EU Commission Decision [9], [10]. Techniques to access spectrum and mitigate interference
that provide at least equivalent performance to the techniques described in harmonized standards adopted under
Directive 1999/5/EC must be used.
(**) For IEEE802.15.4 DSSS modulation used by ZigBee, the modulated signal is spread over 2MHz. So, the
maximum radiated power is 20mW.