MPE Estimates CK61 with IP30

FCC ID: EHAIM4

RF Exposure Info

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FCCID_913605

MPE Estimates System Description CK61 hand held computer with the addition of IP30, RFID hand grip scanner The CK61 is a hand held computer. The unit contains WLAN and Bluetooth radios. FCC ID: EHA802UIAG 802.11 abg FCC ID: HN2-BTM311 Bluetooth The IP30 is a RFID hand grip option. It contains the IM4 RFID PC Card and Bluetooth Radios FCC ID: EHAIM4 915 MHz FCC ID: EHA-BTM4 Bluetooth The radios all transmit on separate antennas. The WLAN or Bluetooth radios operates at anytime when the CK61 is connected to the IP30, operation against the head or body is not considered normal when the IP30 is used to read RFID tags as the IP30 should be aimed toward those tags. The IP30 RFID scanner is operated by the user only when in the hand. The user manual instruct to provide for a separation distance of 23-cm or greater distance between the CK61/IP30 system antennas and the head or torso of the user or near by persons. Radio Disc / Rule MHz - MHz Watts (Conducted) CK61 802.11abg radio FCC ID: EHA802UIAG IC: 1223A-802UIAG 15C 2412 2462 0.045 15E 5180 5240 0.043 15E 5260 5320 0.053 15E 5745 5805 0.029 Bluetooth Radio FCC ID: HN2-BTM311 IC: 1223A-BTM311 15C 2402 2480 0.00869 IP30 RFID radio FCC ID: EHAIM4 IC: 1223A-IM4 15C 902.75 927.25 0.861 Bluetooth Radio FCC ID: EHA-BTM4 IC: 1223A-BTM4 15C 2402 2480 0.00964 Table 1 in 47 CFR 1.1310 defines the maximum permissible exposure (MPE) for the general population. The exposure level at the distance listed from the EUT’s transmitting antenna is calculated using the general equation: Calculations cm inches 23.0 9.06 The exposure level at a 23 cm distance from the EUT’s transmitting antenna is calculated using the general equation (See OET 65, Page 19, Eq. 4): S = (PG)/4PIR2 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 (23 cm = limit for this MPE estimate) PG = EIRP Solving for S, the maximum power densities 23 cm from the transmitting antennas are summarized in the following tables: 802.11abg Radio CK61 antenna with highest power frequency band worst case EIRP FCC ID: EHA802UIAG IC: 1223A-802UIAG Calculation for exposure at 23cm distance Peak Pwr Density Pwr Density Conducted @ 23cm Limit Power Gain mW/cm 2 mW/cm 2 Antenna Description Antenna Type Antenna Part No. Transmit Freq. (MHz) (mW) (dBi) Power Density Ratio Intermec CK61 linear CAF28977 2450 45.000 2 0.0107 1.0 0.010729 Intermec CK61 linear CAF28977 5300 53.000 4 0.0200 1.0 0.020027

Bluetooth CK61 Bluetooth chip antenna worst case EIRP FCC ID: HN2-BTM311 IC: 1223A-BTM311 Calculation for exposure at 23cm distance Peak Pwr Density Pwr Density Conducted @ 23cm Limit Power Gain 2 2 mW/cm mW/cm Antenna Description Antenna Type Antenna Part No. Transmit Freq. (MHz) (mW) (dBi) Power Density Ratio on board chip linear NA 2450 8.690 2 0.0021 1.0 0.002072 RFID Radio IP30 yagi antenna worst case EIRP FCC ID: EHAIM4 IC: 1223A-IM4 Calculation for exposure at 23cm distance Peak Pwr Density Pwr Density Conducted @ 23cm Limit Power Gain 2 2 Antenna Description Antenna Type Antenna Part No. Transmit Freq. (MHz) (mW) (dBi) mW/cm mW/cm Power Density Ratio Intermec IP30 yagi NA 902 861.000 5.2 0.4289 0.601 0.713614 Bluetooth IP30 Bluetooth PC trace antenna worst case EIRP. FCC ID: EHA-BTM4 IC: 1223A-BTM4 Calculation for exposure at 23cm distance Peak Pwr Density Pwr Density Conducted @ 23cm Limit Power Gain 2 Antenna Description Antenna Type Antenna Part No. Transmit Freq. (MHz) (mW) (dBi) mW/cm 2 mW/cm Power Density Ratio PC trace microstrip NA 2450 9.640 0 0.001450 1.0 0.001450 Co-Located Transmitter Calculation of RF Exposure Per FCC TCB Training April 3, 2002 “Devices operating in multiple frequency bands When RF exposure evaluation is required for TCB approval 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.” Worst Case Exposure for CK61 / IP30 when using co-located transmitters. Calculation for exposure at 23cm distance Peak Pwr Density Pwr Density Conducted @ 23cm Limit Transmitter FCC ID: Power Gain Antenna Description Antenna Type Antenna Part No. Transmit Freq. (MHz) (mW) (dBi) mW/cm 2 mW/cm 2 Power Density Ratio FCC ID: EHA802UIAG CK61 linear linear CAF28977 5300 53.0 4 0.0200 1.0 0.0200 FCC ID: HN2-BTM311 Internal chip chip NA 2450 8.7 2 0.0021 1.0 0.0021 FCC ID: EHAIM4 IP30 yagi yagi NA 902 861.0 5.2 0.4289 0.601 0.7136 FCC ID: EHA-BTM4 PC trace microstrip NA 2450 9.6 0 0.0015 1.0 0.0015 ratio limit Total 1.0 0.7372 The worst case configuration for all combinations of co-located transmitters and antennas are shown. In all cases the ratio of exposure compared the limit when totaled does not exceed 1.0.


Document Created: 2008-03-07 09:34:29
Document Modified: 2008-03-07 09:34:29
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