Motorola Canopy Backhaul Module - Manual (Page 3)

Backhaul User Manual Issue 3 Page 3 of 53
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
The Canopy Subscriber Module (SM) 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 (in the 5.7 GHz band), the reflector dish must be installed to provide a separation distance of at least
1.5m (59.1 in) from all persons and does not emit a RF field in excess of 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 200mW.
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
G P
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 10 cm. A four-fold additional compliance margin is artificially introduced by doubling the distance to 20 cm.
In the case of the Canopy SM with reflector, the gain is 26 dBi (a factor of 400), so the peak power density equals the exposure limit at a
distance of about 80 cm. An almost four-fold additional compliance margin is artificially introduced by defining the compliance distance
of 1.5 m. 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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