HL8548 Module MPE Evaluation

FCC ID: N7NHL8548

RF Exposure Info

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FCCID_3362840

MPE Evaluation for HL8548 Wireless Module April 10, 2017

1. Introduction In this application we seek modular approval for the HL8548 radio module. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for HL8548 radio module with FCC CFR 47 §2.1091 and IC RSS-102 for operation in mobile exposure conditions. 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. Any collocated transmitter must have a valid FCC ID with the collocated parameters defined in this MPE report. A separation distance of 20cm or more shall be maintained between the end user and each collocated transmitting antenna.

2. RF Exposure Limits and Equations FCC RULES: 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 RULES: 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: Power density is given by: S = EIRP / (4 * Pi* D^2) where S = Power density (mW/cm^2) EIRP = Equivalent Isotropic Radiated Power (mW) D = Separation distance (cm)

3. HL8548 Product Specs HL8548 will transmit on only one band and mode of operation at any one time. Table 3 lists the supported frequency bands in Canada/USA and the maximum power in each of those bands. Technology Band UL Freq. (MHz) DL Freq. (MHz) Max Power B2 1850 – 1910 1930 – 1990 24 dBm WCDMA/HSDPA/HSUPA B5 829 – 849 864 – 894 24 dBm G850 829 – 849 864 – 894 32 dBm GSM G1900 1850 – 1910 1930 – 1990 30 dBm G850 829 – 849 864 – 894 28 dBm EDGE G1900 1850 – 1910 1930 – 1990 27 dBm Table 3: HL8548 Frequency Bands and Output Power HL8548 supports multislot Class 12 GPRS and Class 12 EGPRS with power backoff for GMSK modulation at 3 and 4 times slots, as specified in Table 4. Table 4: HL8548 Power Backoff

4. Stand-Alone Transmission When HL8548 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 5 below, the resulted EIRP are always below the IC exemption limits for all the operating modes. Maximum Maximum Power IC Maximum Average Density Exemptio Frequency Conducted Antenna Duty ERP/EIRP Technology Conducted EIRP @ 20cm n Limit (MHz) Power Gain Cycle Limits Power (W) (dBm) (W/m^2) (EIRP) (dBm) (dBi) (dBm) G850-GMSK 824 - 849 32 1.58 3.0 25% 28.98 1.57 31.10 7W ERP (2TS) G850-GMSK 824 - 849 31 1.26 3.0 38% 29.80 1.90 31.10 7W ERP (3TS) G850-GMSK 824 - 849 30 1.00 3.0 50% 29.99 1.99 31.10 7W ERP (4TS) G850-8PSK HL8548 module(Standalone) 824 - 849 28 0.63 3.0 25% 24.98 0.63 31.10 7W ERP (2TS) G850-8PSK 824 - 849 28 0.63 3.0 38% 26.80 0.95 31.10 2W EIRP (3TS) G850-8PSK 824 - 849 28 0.63 3.0 50% 27.99 1.25 31.10 2W EIRP (4TS) G1900-GMSK 1850 - 28 0.63 5.0 50% 29.99 1.98 33.50 2W EIRP (4TS) 1910 G1900-8PSK 1850 - 27 0.50 5.0 50% 28.99 1.58 33.50 2W EIRP (4TS) 1910 WCDMA 1850 - 24 0.25 5.0 100% 29.00 1.58 33.50 2W EIRP Band II 1910 WCDMA 824 - 849 24 0.25 3.0 100% 28.00 1.26 31.10 7W ERP Band V Table 5: HL8548 Standalone Transmission

4. Collocated Transmission When HL8548 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 6 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: Σ𝑀𝑃𝐸 𝑅𝑎𝑡𝑖𝑜 = Max (HL8548 MPE ratio) + Max (WLAN/WiMax MPE ratio) + BT MPE Ratio = 0.769+0.192+0.037=0.998 < 1.0 Maximum Maximum Power Maximum Average IC MPE IC Frequency Conducted Antenna Duty Density Technology Conducted EIRP Limit PwrDensity (MHz) Power Gain Cycle @ 20cm Power (W) (dBm) (W/m^2) MPE Ratio (dBm) (dBi) (W/m^2) G850-GMSK 824 - 849 32 1.58 3.0 25% 28.98 1.57 2.58 0.610 (2TS) G850-GMSK 824 - 849 31 1.26 3.0 38% 29.80 1.90 2.58 0.736 (3TS) G850-GMSK 824 - 849 30 1.00 3.0 50% 29.99 1.99 2.58 0.769 (4TS) G850-8PSK 824 - 849 28 0.63 3.0 25% 24.98 0.50 2.58 0.193 (2TS) G850-8PSK 824 - 849 28 0.63 3.0 38% 26.80 0.76 2.58 0.293 (3TS) HL8548 module (Collocated) G850-8PSK 824 - 849 28 0.63 3.0 50% 27.99 0.99 2.58 0.386 (4TS) G1900-GMSK 1850 - 1910 28 0.63 5.0 50% 29.99 1.98 4.48 0.443 (4TS) G1900-8PSK 1850 - 1910 27 0.50 5.0 50% 28.99 1.58 4.48 0.352 (4TS) WCDMA 1850 - 1910 24 0.25 5.0 100% 29.00 1.58 4.48 0.353 Band II WCDMA 824 - 849 24 0.25 3.0 100% 28.00 0.79 2.58 0.307 Band V WLAN 2400 -2500 100% 27.00 1.00 5.35 0.187 Other Collocated WLAN 5150 -5850 100% 27.00 1.00 9.01 0.111 Transmitters WiMax 2300 -2400 100% 27.00 1.00 5.19 0.192 WiMax 2500 -2700 100% 27.00 1.00 5.50 0.181 WiMax 3300 -3800 100% 27.00 1.00 6.65 0.150 BT 2400 -2500 100% 20.00 0.20 5.35 0.037 Table 6: HL8548 Collocated Transmission

5. Conclusion The analysis presented in this report concludes that the HL8548 radio module, when transmitting either in standalone or simultaneously with other co-located radio transmitters within a host device, is compliant with the 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. Maximum Antenna Gain (dBi) EIRP Limits Technology Frequency (MHz) (dbm) Standalone Collocated GPRS/EDGE 850 824-849 3 3 HL8548 GPRS/EDGE 1900 1850-1910 5 5 UMTS 850 824-849 3 3 UMTS 1900 1850-1910 5 5 WLAN 2400 -2500 27 WLAN 5150 -5850 27 Transmitters Collocated WiMAX 2300 -2400 27 WiMAX 2500 -2700 27 WiMAX 3300 -3800 27 BT BT 2400 -2500 20 Table 4: HL8548 RF Exposure Conditions


Document Created: 2017-04-14 17:04:55
Document Modified: 2017-04-14 17:04:55
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