User`s manual

Page 16 of 36 A8520E24A91 – User’s Manual
Release Date 01/23/15
Anaren Integrated Radio (AIR)
A helpful document that can be a starting point in understanding the use of short range devices
(SRD) in Europe is the European Radio Communications Committee (ERC) Recommendation
70-03 E, downloadable from the European Radio Communications Office (ERO)
http://www.erodocdb.dk/Docs/doc98/official/pdf/REC7003E.PDF.
The end user is responsible for ensuring compliance with harmonized frequencies and labeling
requirements for each country the end device is marketed and sold. For more information see:
 Radio And Telecommunications Terminal Equipment (R&TTE)
http://ec.europa.eu/enterprise/sectors/rtte/index_en.htm
 European Conference of Postal and Telecommunications Administrations (CEPT)
http://www.cept.org/
 European Telecommunications Standards Institute (ETSI) http://www.etsi.org/
 European Communications Office (ECO) http://www.cept.org/eco
2.2. Potential Interference Sources
The two main mechanisms that allow a PurePath wireless system to co-exist amicably in close
proximity to other 2.4 GHz radio systems are:
 The adaptive frequency hopping scheme described in section 2.2 that ensures that RF
channels used by other radio systems are avoided
 Adaptive listen-before-talk mechanism that measures energy in RF channel before
transmitting and avoids transmitting if the channel is already in use
These mechanisms together ensure that other radio systems are minimally impacted by a
PurePath Wireless audio network in normal circumstances. However, since a low-latency audio
network by its very nature transports a very time-critical data stream, both mechanisms have
adaptive thresholds to ensure that the audio network is given its fair share of RF spectrum in
very crowded RF environments.
2.3. Approved Usage
The A8520E24A91 module has been approved for use in the US, Canada and Europe. The
user is encouraged to use minimum power required to establish a link, thus minimizing
interference.
Changes or modifications to the module and/or operation outside the limits are prohibited and
could void the user’s authority to operate the modules.
2.3.1. US and Canada
Within the US and Canada, the A8520E24A91 modules have been approved for use as digitally
modulated transmitters, for which they conform to the BW (a minimum of 500 kHz 6-dB BW for
US, a maximum BW of 0.5% of the carrier frequency for Canada), power spectral density (max