Multitech MT-SMI-DK, Development Manual

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CHAPTER 8 – ANTENNAS, CABLES, AND GPS
Universal Socket Developer Guide 58
When one of the following test exclusion conditions is satisfied for all combinations of simultaneous transmission
configurations, further equipment approval is not required to incorporate transmitter modules in host devices
that operate in the mixed mobile and portable host platform exposure conditions. The grantee is responsible for
documenting this according to Class I permissive change requirements. Antennas that qualify for standalone SAR
test exclusion must apply the estimated standalone SAR to determine simultaneous transmission test exclusion.

The [∑of (the highest measured or estimated SAR for each standalone antenna configuration, adjusted for
maximum tune-up tolerance) / 1.6 W/kg] + [∑of MPE ratios] is ≤1.0.

The SAR to peak location separation ratios of all simultaneous transmitting antenna pairs operating in
portable exposure conditions are all ≤0.04 and the [∑of MPE ratios] is ≤1.0.
When RF exposure test exclusion does not apply, simultaneous transmission evaluation is required for mixed
mobile and portable exposure conditions. The enlarged zoom scan measurement and volume scan post-
processing procedures in KDB 865664 must be applied to test the simultaneous transmitting antennas operating in
portable exposure conditions for each simultaneous transmission configuration. The [(highest measured
simultaneous transmission SAR, adjusted for maximum tune-up tolerance) / 1.6 W/kg] + [∑of MPE ratios] must be
≤1.0; otherwise, compliance must be determined by the FCC on a case-by-case basis with respect to antenna-to-
antenna and antenna-to-user separation, device form factor, operating requirements and exposure conditions,
etc.
FCC Definitions
Mobile Device — FCC CFR Title 47 Part 2.1091 Radiofrequency radiation exposure evaluation:
(b) A mobile device is defined as a transmitting device designed to be used in other than fixed locations and to
generally be used in such a way that a separation distance of at least 20 centimeters is normally maintained
between the transmitters radiating structure(s) and the body of the user or nearby persons.
Portable Device — FCC CFR Title 47 Part 2.1093 Radiofrequency radiation exposure evaluation:
(b) A portable device is defined as a transmitting device designed to be used so that the radiating structure(s) of
the device is/are within 20 centimeters of the body of the user.
Host Labeling
The following statements are required to be on the host label:
This device contains FCC ID: {Add the FCC ID of the specific device}
This device contains equipment certified under IC ID: {Add the IC ID of the specific device}
For additional labeling requirements, see Labeling Requirements .
Antenna Diversity
Antenna diversity uses two receive antennas to improve the downlink connection (cell tower to mobile). It has no
effect on the uplink (mobile to cell tower).
Antenna diversity is most useful in environments where the signal arrives at the device after bouncing off or
around inside buildings or off other objects. The bounced signal may be attenuated by going through semi-
transparent (to the signal) objects. Each signal alteration can change its magnitude, phase, orientation, and/or
polarization. This complex environment exists in cities, inside buildings, in traffic, or any place in proximity to man-
made objects. In this environment, signal paths from the cell tower form an interference pattern of peaks and
nulls. These peaks and nulls can be very close together.