User's Manual

Backhaul User Manual Draft for Regulatory Review
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Backhaul 5.725 to 5.825
GHz
200mW RMS 1 Watt EIRP High Index 2-level
or 4-level FSK
5745 to 5805 MHz in
5 MHz increments
20 MHz
Backhaul with
Reflector
5.725 to 5.825
GHz
200mW RMS 63 Watts EIRP High Index 2-level
or 4-level FSK
5745 to 5805 MHz in
5 MHz increments
20 MHz
Canopy can be configured to operate at a range of frequencies, but at this time, only channels from 5745 MHz through 5805 MHz of the
5.7 GHz product have been tested for compliance with relevant EC directives. Before configuring equipment to operate outside this
range, please check with your regulator.
Exposure Note
A Canopy module must be installed to provide a separation distance of at least 20 cm (7.9 in) from all persons. When adding the Canopy
reflector dish, the reflector dish must be installed to provide a separation distance of at least 1.5m (59.1 in) from all persons. When so
installed, the module’s RF field is within Health Canada limits for the general population; consult Safety Code 6, obtainable from Health
Canada’s website http://www.hc-sc.gc.ca/rpb.
In both configurations the maximum RMS power does not exceed 340mW.
The applicable power density exposure limit is 10 Watt/m
2
, according to the FCC OET Bulletin 65, the ICNIRP guidelines, and the
Health Canada Safety Code 6. The corresponding compliance distances referenced above have been determined by assuming worst-case
scenarios. The peak power density (S) in the far-field of a radio-frequency source with rms transmit power P and antenna gain G at a
distance d is
2
4 d
GP
S
π
⋅
=
In the case of the Canopy SM without reflector, the gain is 8 dBi (a factor of 6.3), so the peak power density equals the exposure limit at
a distance of 13 cm for 2.4 GHz product and 10 cm for 5.2 and 5.7 GHz product. A power compliance margin of over 2 is artificially
introduced by setting the distance to a consistent 20 cm across all modules, giving a power compliance margin of x2.4 for 2.4 GHz
modules and x4 for 5.2 and 5.7 GHz modules.
In the case of the Canopy SM with reflector, the gain depends on frequency and ranges from 19 dBi (a factor of 80) for 2.4 GHz modules
to 26 dBi (a factor of 400) for 5.2 GHz Extended Range and 5.7 GHz modules, so the peak power density equals the exposure limit at a
distance of 10 to 80 cm. A power compliance margin is artificially introduced by defining a consistent compliance distance of 1.5 m
across all modules with reflectors, giving a power compliance margin of x10 for 2.4 GHz modules, x220 for 5.2 GHz Extended Range
modules, and x3.5 for 5.7 GHz modules. The compliance distance is greatly overestimated in this case because the far-field equation
neglects the physical dimension of the antenna, which is modeled as a point-source.
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