MPE Estimates

FCC ID: EHABTS080

RF Exposure Info

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FCCID_711338

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 head or torso of the user or nearby persons and can therefore be considered a mobile transmitter per 47 CFR 2.1091 (b). The 700C handheld computer can have up to three radio modules installed: A GSM radio module, the MC75; a Bluetooth module, the BTS080; and an 802.11 module, the DRCB. The radios can transmit simultaneously. Each radio transmits through its own antenna. In addition, the 700C can be co-located with other radios in a variety of Intermec devices including the 6820 and PW40 Bluetooth printers or the IP3 and IP4 RFID handheld grips. 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:

MPE Estimates for Self Co-located Device FCC ID: EHAMC75 GSM radio in 700C General Max Peak Minimum Power Ratio of Power Antenna Part Transmit Population Antenna Type Conducted Antenna Gain Antenna Density @ 20 Density to the No. Frequency Exposure Limit Output Power Cable Loss cm Exposure Limit from 1.1310 2 2 (MHz) (mW) (dBi) (dB) (mW/cm ) (mW/cm ) Radome 805-640-100 1850 724 -1.8 0 0.095 1 0.095 Radome 805-640-100 824 1413 -2.4 0 0.162 0.55 0.294 Worst Case Ratio of Power Density to the Exposure Limit = 0.294 FCC ID: EHABTS080 Bluetooth radio in 700C General Max Peak Minimum Power Ratio of Power Antenna Part Transmit Population Antenna Type Conducted Antenna Gain Antenna Density @ 20 Density to the No. Frequency Exposure Limit Output Power Cable Loss cm Exposure Limit from 1.1310 (MHz) (mW) (dBi) (dB) (mW/cm2) (mW/cm2) Internal Integral Antenna PCB Trace 2400 13.86 -1.23 0 0.002 1 0.002 Worst Case Ratio of Power Density to the Exposure Limit = 0.002 FCC ID: EHADRCB 802.11(b)/(g) radio in 700C General Max Peak Minimum Power Ratio of Power Antenna Part Transmit Population Antenna Type Conducted Antenna Gain Antenna Density @ 20 Density to the No. Frequency Exposure Limit Output Power Cable Loss cm Exposure Limit from 1.1310 2 2 (MHz) (mW) (dBi) (dB) (mW/cm ) (mW/cm ) Internal PCB CAF94656 2400 18.9 2 0 0.006 1 0.006 Worst Case Ratio of Power Density to the Exposure Limit = 0.006

FCC ID: EHABTS080-1 Bluetooth radio in 6820 printer or in PW40 printer General Max Peak Minimum Power Ratio of Power Antenna Part Transmit Population Antenna Type Conducted Antenna Gain Antenna Density @ 20 Density to the No. Frequency Exposure Limit Output Power Cable Loss cm Exposure Limit from 1.1310 (MHz) (mW) (dBi) (dB) (mW/cm2) (mW/cm2) Internal PCB PCB 2400 13.86 -1 0 0.002 1 0.002 Worst Case Ratio of Power Density to the Exposure Limit = 0.002 FCC ID: EHARFID915PCC-6 RFID radio in the IP3 General Max Peak Minimum Power Ratio of Power Antenna Part Transmit Population Antenna Type Conducted Antenna Gain Antenna Density @ 20 Density to the No. Frequency Exposure Limit Output Power Cable Loss cm Exposure Limit from 1.1310 (MHz) (mW) (dBi) (dB) (mW/cm2) (mW/cm2) Panel 805-616-001 902 1000 0 0 0.199 0.601 0.331 Worst Case Ratio of Power Density to the Exposure Limit = 0.331 FCC ID: EHAIM4 RFID Radio in the IP4 General Max Peak Minimum Power Ratio of Power Antenna Part Transmit Population Antenna Type Conducted Antenna Gain Antenna Density @ 20 Density to the No. Frequency Exposure Limit Output Power Cable Loss cm Exposure Limit from 1.1310 (MHz) (mW) (dBi) (dB) (mW/cm2) (mW/cm2) Ceramic Patch 805-616-001 902 860.99 0 0 0.171 0.601 0.285 Ceramic Patch 805-616-002 902 860.99 2.5 0 0.305 0.601 0.507 Worst Case Ratio of Power Density to the Exposure Limit = 0.507

Exposure Scenarios for 700C Worst Case Co-located Exposure Condition Per Note 24 shown below, the Sum of Worst Case Power Ratios cannot exceed 1.0 Bluetooth GSM Radio 802.11 Radio Sum of Worst Radio Worst Case Worst Case Case Ratios FCC Limit for Worst Case Ratio of Power Ratio of Power (Power Density Sum of Worst Ratio of Power Density to the Density to the to the Exposure Case Ratios Density to the Exposure Limit Exposure Limit Limit) Exposure Limit 0.29400 0.00200 0.00600 0.30200 1.0 PASS The results shown in the above table are equivalent to the Sum of the EIRP of the Co-located Transmitters (EIRP TX1 + EIRP TX2 + EIRP TX3) compared to the exposure limit. The benefit of this method, is that accounts for transmitters operating at different frequencies against different exposure limits. Worst Case Co-located Exposure Condition Per Note 24 shown below, the Sum of Worst Case Power Ratios cannot exceed 1.0 700C co- PW40 located Bluetooth Sum of Worst radios radio Worst Case Ratios FCC Limit for Worst Case Case Ratio of (Power Density Sum of Worst Ratio of Power Power Density to the Exposure Case Ratios Density to the to the Limit) Exposure Limit Exposure Limit 0.30200 0.00200 0.30400 1.0 PASS The results shown in the above table are equivalent to the Sum of the EIRP of the Co-located Transmitters (EIRP TX1 + EIRP TX2) compared to the exposure limit. The benefit of this method, is that accounts for transmitters operating at different frequencies against different exposure limits. Worst Case Co-located Exposure Condition Per Note 24 shown below, the Sum of Worst Case Power Ratios cannot exceed 1.0 700C co- 6820 located Bluetooth Sum of Worst radios radio Worst Case Ratios FCC Limit for Worst Case Case Ratio of (Power Density Sum of Worst Ratio of Power Power Density to the Exposure Case Ratios Density to the to the Limit) Exposure Limit Exposure Limit 0.30200 0.00200 0.30400 1.0 PASS The results shown in the above table are equivalent to the Sum of the EIRP of the Co-located Transmitters (EIRP TX1 + EIRP TX2) compared to the exposure limit. The benefit of this method, is that accounts for transmitters operating at different frequencies against different exposure limits.

Worst Case Co-located Exposure Condition Per Note 24 shown below, the Sum of Worst Case Power Ratios cannot exceed 1.0 700C co- located RFID Radio Sum of Worst radios Worst Case Case Ratios FCC Limit for Worst Case Ratio of Power (Power Density Sum of Worst Ratio of Power Density to the to the Exposure Case Ratios Density to the Exposure Limit Limit) Exposure Limit 0.30200 0.33100 0.63300 1.0 PASS The results shown in the above table are equivalent to the Sum of the EIRP of the Co-located Transmitters (EIRP TX1 + EIRP TX2) compared to the exposure limit. The benefit of this method, is that accounts for transmitters operating at different frequencies against different exposure limits. Worst Case Co-located Exposure Condition Per Note 24 shown below, the Sum of Worst Case Power Ratios cannot exceed 1.0 700C co- located RFID Radio Sum of Worst radios Worst Case Case Ratios FCC Limit for Worst Case Ratio of Power (Power Density Sum of Worst Ratio of Power Density to the to the Exposure Case Ratios Density to the Exposure Limit Limit) Exposure Limit 0.30200 0.50700 0.80900 1.0 PASS The results shown in the above table are equivalent to the Sum of the EIRP of the Co-located Transmitters (EIRP TX1 + EIRP TX2) compared to the exposure limit. The benefit of this method, is that accounts for transmitters operating at different frequencies against different exposure limits.

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 ratios (power density to the exposure limit) does not exceed 1.0; therefore, the exposure condition is compliant with FCC rules.


Document Created: 2006-08-22 10:21:04
Document Modified: 2006-08-22 10:21:04
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