RF Exposure Report

FCC ID: N7NHL78

RF Exposure Info

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FCCID_4309477

MPE Evaluation for HL7800 Radio Module May 27, 2019

Contents 1. Introduction..................................................................................................... 2 2. RF Exposure Limits and Equations ................................................................ 3 3. Stand-Alone Transmission ............................................................................. 5 4. Collocated Transmission ................................................................................ 6 5. Conclusion...................................................................................................... 7

1. Introduction In this application we seek modular approval for the HL7800 radio module for use in standalone and collocated simultaneous transmission under mobile and fixed configurations. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for HL7800 radio module with FCC CFR 47 §2.1091 and IC RSS-102 for standalone and collocated transmission in the exposure conditions where a separation distance of at least 20 centimeters is normally maintained between the transmitter's radiating structure(s) and the body of the user or nearby persons. The MPE analysis is limited for US / Canada bands only. The general population/uncontrolled exposure limits are applicable to situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment may not be made fully aware of the potential for exposure or cannot exercise control over their exposure.

2. RF Exposure Limits and Equations FCC Limits: According to FCC OET Bulletin 65 Supplement C, the criteria listed in Table 1 shall be used to evaluate the environmental impact of human exposure to radio frequency (RF) radiation as specified in §1.1307. Table 1 : Limits for Maximum Permissible Exposure (MPE) IC Limits: IC has adopted the RF field strength limits established in Health Canada’s RF exposure guideline. The limits are shown in Table 2 below per RSS- 102. Table 2 : RF Field Strength Limits for Devices Used by the General Public (Uncontrolled Environment)

In the frequency range of 300-6000 MHz, the IC limits are more stringent than the FCC limits. The MPE evaluation in this report will be based on the IC limits, so the deduced output power and antenna gain limits will guarantee compliance with both FCC and IC requirements. EQUATIONS: EIRP (dBm) = Conducted Power (dBm) + Antenna Gain (dBi) Power density is given by : S = EIRP / (4 π * D^2) where S = Power density (mW/cm^2) EIRP = Equivalent Isotropic Radiated Power (mW) D = Separation distance (cm)

3. Stand-Alone Transmission When HL7800 module transmits as a stand-alone mobile device, the source- based time-averaged EIRP is calculated by summing up conducted power and antenna gain. A 100% duty cycle is used for calculations to present a worse-case analysis. The antenna gains are chosen so that the resulted radiated power levels are within the limits specified by the FCC rules and IC Radio Standards Specifications (RSS). The IC exemption limits for routine RF exposure evaluation are calculated using the lowest frequency of the operating band presenting the most stringent limits. As shown in Table 2 below, the resulted EIRP are always below the IC exemption limits for all the operating modes. Max Max Source- IC Time- Time- Max Based Exemption TX Freq Range Avg Avg Ant Time- EIRP/ERP Operating Mode Limit (MHz) Cond Cond Gain Averaged Limits (EIRP) Power Power (dBi) Max EIRP (dBm) (dBm) (W) (dBm) LTE Band 2 1850 1910 24 0.25 6 30 33.50 2 W EIRP LTE Band 4 1710 1755 24 0.25 6 30 33.27 1 W EIRP 6.3 W LTE Band 5 824 849 24 0.25 6 30 31.10 ERP LTE Band 12 699 716 24 0.25 6 30 30.61 3 W ERP LTE Band 13 777 787 24 0.25 6 30 30.93 3 W ERP LTE Band 14 788 798 24 0.25 6 30 30.97 3 W ERP LTE Band 17 704 716 24 0.25 6 30 30.63 3 W ERP LTE Band 25 704 716 24 0.25 6 30 33.50 3 W ERP LTE Band 26 1710 1780 24 0.25 6 30 31.06 3 W ERP LTE Band 66 1710 1780 24 0.25 6 30 33.27 3 W ERP Table 2: WP7610 Stand-Alone Transmission

4. Collocated Transmission When HL7800 module co-transmits with radio transmitter(s) as a mobile device, per KDB 447498 D01, simultaneous transmission MPE test exclusion applies when the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated, numerically modeled or measured field strengths or power density, is ≤ 1.0. The evaluation here considers a WiMAX or WLAN transmitter, and a Bluetooth transmitter as collocated transmitters. Their radiated output power levels are listed in Table 3 below. The MPE ratio is defined by the ratio of power density to MPE limit. The sum of the MPE ratios is calculated as follows: ∑𝑀𝑃𝐸 𝑅𝑎𝑡𝑖𝑜 = Max (WP7610 MPE ratio) + Max (WLAN MPE ratio) + BT MPE Ratio + Max (WiGig MPE ratio) = 0.545+0.372+0.015+0.063=0.995 < 1.0 Max Max Source- Time- Time- Max Power IC Based IC TX Freq Avg Avg Ant Density MPE Operating Mode Time- PwrDensity Range (MHz) Cond Cond Gain @20 cm Limit Averaged MPE Ratio Power Power (dBi) (W/m^2) (W/m2) Max EIRP (dBm) (W) LTE Band 2 1850 1910 24 0.25 6 30 1.99 4.48 0.444 LTE Band 4 1710 1755 24 0.25 6 30 1.99 4.24 0.469 LTE Band 5 824 849 24 0.25 4 28 1.26 2.58 0.487 LTE Band 12 699 716 24 0.25 4 28 1.26 2.30 0.545 LTE Band 13 777 787 24 0.25 4 28 1.26 2.47 0.507 LTE Band 14 788 798 24 0.25 3 27 1.00 2.50 0.399 LTE Band 17 704 716 24 0.25 3 27 1.00 2.31 0.431 LTE Band 25 704 716 24 0.25 6 30 1.99 4.48 0.444 LTE Band 26 1710 1780 24 0.25 3 27 1.00 2.55 0.390 LTE Band 66 1710 1780 24 0.25 6 30 1.99 4.24 0.469 WLAN 2.4 GHz 2400 2500 30 1.99 5.35 0.372 WLAN 5 GHz 5150 5850 30 1.99 9.01 0.221 BT 2400 2500 16 0.08 5.35 0.015 WiGig 58320 62640 25 0.63 10.00 0.063 Table 3: HL7800 Collocated Transmission

5. Conclusion The analysis presented in this report concludes that the HL7800 radio module, when transmitting either in standalone or simultaneously with other co-located radio transmitters within a host device, is compliant with the FCC/IC RF exposure requirements in mobile exposure condition, provided the conducted power and antenna gain do not exceed the limits in Table 4 for each given frequency band and operating mode. Max Antenna Gain Time- Limits(dBi) EIRP TX Freq Avg Operating Mode Limits Range (MHz) Cond Standalone Collocated (dBm) Power (dBm) HL7800 LTE Band 2 1850 1910 24 6 6 30 HL7800 LTE Band 4 1710 1755 24 6 6 30 HL7800 LTE Band 5 824 849 24.5 6 4 30 HL7800 LTE Band 12 699 716 24 6 4 30 HL7800 LTE Band 13 777 787 24 6 4 30 HL7800 LTE Band 14 788 798 24.5 6 3 30 HL7800 LTE Band 17 704 716 24 6 3 30 HL7800 LTE Band 25 1850 1915 24 6 6 30 HL7800 LTE Band 26 814 849 24 6 3 30 HL7800 LTE Band 66 1710 1780 24 6 6 30 WLAN 2.4 GHz 2400 2500 30 Collocated WLAN 5 GHz 5150 5850 30 Radio BT 2400 2500 16 Transmitters WiGig 58320 62640 25 Table 4: HL7800 RF Exposure Conditions


Document Created: 2019-05-27 18:36:00
Document Modified: 2019-05-27 18:36:00
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