MPE Estimates self lo

FCC ID: KBCIX-MC8775

RF Exposure Info

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FCCID_908501

Applicant: General Dynamics Itronix Corporation FCC ID: KBCIX-MC8775

Compliance with 47 CFR 15.247(i)

“Systems operating under the provisions of this section shall be operated in a manner that
ensures that the public is not exposed to radio frequency energy levels in excess of the
Commission's guidelines. See § 1.1307(b)(1) of this chapter.”

The EUT will only be used with a separation distance of 20 centimeters or greater between the antenna and the body of the
user or nearby persons and can therefore be considered a mobile transmitter per 47 CFR 2.1091 (b). Calculations are
provided for each radio transmitting through its own internal antenna and optional external antenna.

The total transmit power is less than 1.5 W (ERP), therefore the EUT is categorically excluded from routine environmental
evaluation per 47 CFR 2.1091(c).

The MPE estimates are as follows:

Table 1 in 47 CFR 1.1310 defines the maximum permissible exposure (MPE) for the general population. The exposure level
at a 20 cm distance from the EUT’s transmitting antenna is calculated using the general equation:

S = (PG)/4πR2
Where: S = power density (mW/cm2)
P = power input to the antenna (mW)
G = numeric power gain relative to an isotropic radiator
R = distance to the center of the radiation of the antenna (20 cm = limit for MPE estimates)
PG = EIRP

Solving for S, the maximum power densities 20 cm from the transmitting antennas are summarized in the tables on the
following pages:

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Applicant: General Dynamics Itronix Corporation FCC ID: KBCIX-MC8775

MPE Estimates for Self Located Device

FCC ID: KBCIX-MC8775
In the IX605 Host PC
GSM, GPRS, EDGE, UMTS, WCDMA, HSDPA
Source-
based
time Ratio of
General
averaging Power
Max Peak Max Power Population
Transmit corrected Density to
Antenna Type Antenna Part No. EIRP ERP Density @ Exposure
Frequency Power the
Output Output 20 cm Limit from
Density @ Exposure
1.1310
20 cm Limit
IX605 Primary
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WAN (MHz) (mW) (mW) (mW/cm ) (mW/cm2) (mW/cm2)
Meander Line Skycross 2-2920 848.8 3872.04 2361 0.770 0.1925 0.56 0.340
Meander Line Skycross 2-2920 1850.2 1589.0 0.316 0.079 1 0.079

Worst Case Ratio of Power Density to the Exposure Limit = 0.340
Source-based time averaging corrected for the GPRS Duty Cycle of 25% “worst case”.

Excerpts from TCB Training, April 3, 2002, “Mobile Transmitters”, Slide 6:

“Devices operating in multiple frequency bands

When RF exposure evaluation is required for TCB approval
o Separate antennas – estimated minimum separation distances may be considered for the
frequency bands that do not require evaluation or TCB approval, however, the estimated distance
should take into account the effect of co-located transmitters. (Note 24)

Note 24 According to multiple frequency exposure criteria, the ratio of field strength or power
density to the applicable exposure limit at the exposure location should be determined for each
transmitter and the sum of these ratios must not exceed 1.0 for the location to be compliant.”

The sum of the ratio(s) (power density to the exposure limit) does not exceed 1.0; therefore, the exposure condition is
compliant with FCC rules.

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Document Created: 2008-02-13 11:05:37
Document Modified: 2008-02-13 11:05:37

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