User's Manual

©e2v technologies (uk) limited 2010 107553 09 Aug 2010 DAS762156AA (UK) Version 11, page 55
25. How do I change the Wi-Fi channel or other settings?
This may be of use where there is a known source of interference, for example another Wi-Fi
system. Note that, although there are up to 14 channels, several are not permitted in most
countries and that only 1, 6 and 11 are independent.
The adjustment of these settings in the module is different across the various versions of module
firmware; please consult the factory for assistance. In some instances familiarity with TELNET
access is required while other modules are accessible using a web interface.
Do not change channels unless certain that the system will be legal at all
times by using the correct router settings.
Operation on channels 9 – 13 (above 2454 MHz) is not permitted outdoors in
France.
Check http://www.art-telecom.fr/ for more details.
Là où utilisé dehors, creuser des rigoles seulement 1 – 8 (2400-
2454 MHz) peuvent être employés.
Visitez http://www.art-telecom.fr/ pour de plus amples détails.
26. How do I change the LRT channel or other settings?
Do not change power or frequency unless certain that the system will be legal
at all times.
The frequency, bandwidth and power settings should only be changed by
competent persons who have a thorough understanding of the legal
implications of the local license conditions for radio transmission.
Transmission with improper settings may be an offence in your location.
The other settings such as the FEC and guard interval settings have been chosen to give the best
range in a difficult environment; they were set while testing a transmitter in a basement being
received in the first floor of a nearby building. It should not be necessary to alter these for most
uses and a mismatch between transmitter and receiver may cause the system to cease
functioning. The only exception would be use with a command vehicle where the transmitter is to
be set to suit the system in the vehicle or to implement higher security settings. If in doubt, the
installer should contact e2v in this case to determine the best approach.
27. How do I license the LRT transmitter?
Consult your local radio authorities for details of frequencies and permitted powers for your
location. Contact details are given in section 15 and 16 or your local distributor may be able to
assist. The authorities will need a copy of the DTX RF data from section 12. Using a licensed
frequency will generally allow higher power and reduced interference, which will both improve the
system performance.
In many countries, low power use is permitted in the 2400 – 2483.5 MHz area without a licence.
However this is likely to result in lower performance due to the power restrictions and interference
from other licence-exempt uses.