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Avoidance of weather radars (USA only)
To comply with FCC rules (KDB 443999: Interim Plans to Approve UNII Devices Operating in the 5470 -
5725 MHz Band with Radar Detection and DFS Capabilities), units which are installed within 35 km (22
miles) of a Terminal Doppler Weather Radar (TDWR) system (or have a line of sight propagation path
to such a system) must be configured to avoid any frequency 30 MHz or –30 MHz of the
frequency of the TDWR device.
This requirement applies even if the master is outside the 35 km (22
miles) radius but communicates with outdoor clients which may be within the 35 km (22 miles) radius of
the TDWRs. If interference is not eliminated, a distance limitation based on line-of-sight from TDWR will
need to be used. Devices with bandwidths greater than 20 MHz may require greater frequency
separation.
When planning a link in the USA, visit
http://spectrumbridge.com/udia/home.aspx
, enter the location of
the planned link and search for TDWR radars. If a TDWR system is located within 35 km (22 miles) or
has line of sight propagation to the PTP device, perform the following tasks:
•
Register the installation on
http://spectrumbridge.com/udia/home.aspx
•
Make a list of channel center frequencies that must be barred, that is, those falling within
+30 MHz or –30 MHz of the frequency of the TDWR radars.
The 450 Platform Family AP must be configured to not operate on the affected channels.
Canada specific information
Caution
This device complies with ISEDC ’s license-exempt RSSs. Operation is subject to the
following two conditions:
(1) This device may not cause interference; and
(2) This device must accept any interference, including interference that may cause
undesired operation of the device.
ISEDC requires manufacturers to implement special features to prevent interference to weather radar
systems that operate in the band 5600 MHz to 5650 MHz. These features must be implemented in all
products able to operate outdoors in the band 5470 MHz to 5725 MHz.
Manufacturers must ensure that such radio products cannot be configured to operate outside of ISEDC
rules; specifically it must not be possible to disable or modify the radar protection functions that have
been demonstrated to ISEDC .
In order to comply with these ISEDC requirements, Cambium supplies variants of the 450 Platform
Family for operation in Canada. These variants are only allowed to operate with license keys that
comply with ISEDC rules. In particular, operation of radio channels overlapping the band 5600 MHz to
5650 MHz is not allowed and these channels are permanently barred.
In addition, other channels may also need to be barred when operating close to weather radar
installations.
Other variants of the 450 Platform Family are available for use in the rest of the world, but these
variants are not supplied to Canada except under strict controls, when they are needed for export and
deployment outside Canada.
