Shenzhen RAKwireless Technology Co.,Ltd. RAK11720 WisDuo LPWAN Module 2AF6B-RAK11720 2AF6BRAK11720 rak11720
1. Radio Frequency Exposure RESULT: Test standard Pass FCC Part 2: Section 2.1091 : KDB 447498 D01 General RF Exposure Guidance v06 RSS-102 Issue 6, December 2023 1.1 Product Technical Information The EUT is a WisDuo LPWAN+BLE Module which supports Lora and Bluetooth Low Energy technologies. This module has two different antennas for Lora and one antenna for BLE, the details specifications for these antennas as below: For Lora: Antenna # Model Antenna Gain Antenna Type Connector Type 1# RAKARJ14 2.3 dBi Dipole Antenna RP-SMA connector 2# RAKARJ16 2.3 dBi Dipole Antenna RP-SMA connector Note: 1. When connecting to the module, all antennas listed above need to transfer to an IPEX connector. 2. Antennas 1# and 2# have the same type and similar in-band and out-of-band characteristics and only the color of enclosure differnet, they are considered as equivalent antennas. Thus, the antenna 1# was selected to be tested. For BLE: Antenna # 1# Model Antenna Gain Antenna Type Connector Type S2B1BH2A1B01000 3.12 dBi PCB Layout Antenna IPEX connector This report is a FCC CIIPC and IC CIIIPC report for adding additional LoRa operating bands. New added LoRa has two different independent configurations and they cannot work simultaneously, details as below: Configuration 1: Data Rate SF (Spreading factor) 0 LoRa Modulation: SF10 / Bandwidth 125 kHz 1 LoRa Modulation: SF9 / Bandwidth 125 kHz 2 LoRa Modulation: SF8 / Bandwidth 125 kHz 3 LoRa Modulation: SF7 / Bandwidth 125 kHz 4 LoRa Modulation: SF8 / Bandwidth 500 kHz Operating Frequency Original: 902.3 914.9 MHz New: 915.1 927.7 MHz Original: 903 914.2 MHz New: 915.8 927.0 MHz Configuration 2: Data Rate SF (Spreading factor) Operating Frequency 0 LoRa Modulation: SF12 / Bandwidth 500 kHz 1 LoRa Modulation: SF11 / Bandwidth 500 kHz 2 LoRa Modulation: SF10 / Bandwidth 500 kHz Original: n/a 3 LoRa Modulation: SF9 / Bandwidth 500 kHz New: 902.5 927.1 MHz 4 LoRa Modulation: SF8 / Bandwidth 500 kHz 5 LoRa Modulation: SF7 / Bandwidth 500 kHz This report only includes test data for new operating frequency for both config1&2. For details refer to the User Manual, Technical Description and Circuit Diagram. General Information of EUT Kind of Equipment Type Designation Trademark FCC ID IC HVIN FVIN Value WisDuo LPWAN+BLE Module RAK11720 RAK 2AF6B-RAK11720 25908-RAK11720 RAK11720 RUI_3.5.2+user_final.hex Page 2 of 4 Operating Voltage DC 3.6V Max. (Supplied by socket of PCB borad) Testing Voltage DC 5V Via USB port Technical Specification of Lora DTS Operating Frequency 903 914.2 MHz and 915.8 927.0 MHz 902.5 927.1 MHz Type of Modulation Lora Data Rate SF8 / DR4 for 903 914.2 MHz and 915.8 927.0 MHz SF7-SF12 / DR0 to DR5 for 902.5 927.1 MHz Channel Number 16 channels (Upstream) Channel Separation 1.6 MHz Occupied Bandwidth 500 kHz Technical Specification of Lora FHSS Frequency Range 902.3 914.9MHz and 915.1 927.7 MHz Type of Modulation Lora Data Rate SF7 to SF10 / DR0 to DR3 Channel Number 127 channels (Upstream) Channel Separation 200 kHz Occupied Bandwidth 125 kHz Technical Specification of BLE Operating Frequency 2402 - 2480 MHz Type of modulation GFSK Channel Number 40 channels Channel Separation 2 MHz Data Rate 1Mbps 1.2 Product Classification This device defined as a transmitting device designed to be used in other than fixed locations and to generally be used in such a way that a separation distance of at 20 cm is normally maintained between the transmitter's radiating structure(s) and the body of the user or nearby persons. 1.3 Radio Frequency Exposure Limit For FCC: Frequency range Electric field strength Magnetic field strength Power density (MHz) (V/m) (A/m) (mW/cm²) (A) Limits for Occupational/Controlled Exposure 0.3-3.0 614 1.63 *100 3.0-30 1842/f 4.89/f *(900/f²) 30-300 61.4 0.163 1.0 300-1,500 -- -- f/300 1,500-100,000 -- -- 1.0 (B) Limits for General Population/Uncontrolled Exposure 0.3-3.0 614 1.63 *100 3.0-30 824/f 2.19/f *(180/f²) 30-300 27.5 0.073 0.2 300-1,500 -- -- f/1500 1,500-100,000 -- -- 1.0 f = frequency in MHz. * = Plane-wave equivalent power density. Average Time (minutes) <6 <6 <6 <6 <6 <30 <30 <30 <30 <30 Page 3 of 4 For IC: 1.4 Radio Frequency Exposure Calculation Formula 1.5 Calculation Result 1.5.1 Stand-alone transmission MPE, LoRa Configuration 1 Operating Mode Band PG (dBm) PG (W) Calculation (mW/cm2) Lora 902-928MHz 23.61 0.2296 0.046 BLE 2.4G 5.92 0.00391 0.001 FCC Limit (mW/cm2) 0.601 1.0 Operating Mode Lora BLE Band 902-928MHz 2.4G PG (dBm) 23.61 5.92 PG (W) 0.2296 0.00391 Calculation (W/m2) 0.457 0.008 1.5.2 Stand-alone transmission MPE, LoRa Configuration 2 Operating Mode Band PG (dBm) PG (W) Calculation (mW/cm2) Lora 902-928MHz 23.66 0.2323 0.046 BLE 2.4G 5.92 0.00391 0.001 IC Limit (W/m2) 2.74 5.35 FCC Limit (mW/cm2) 0.601 1.0 Operating Mode Lora BLE Band 902-928MHz 2.4G PG (dBm) 23.66 5.92 PG (W) 0.2323 0.00391 Calculation (W/m2) 0.462 0.008 IC Limit (W/m2) 2.74 5.35 Verdict Pass Pass Verdict Pass Pass Verdict Pass Pass Verdict Pass Pass Page 4 of 4 1.5.3 Simultaneous transmission MPE, LoRa Configuration 1 FCC Operating Mode Lora Ratio BLE Ratio Sum Ratio Lora+ BLE 0.077 0.001 0.078 IC Operating Mode Lora Ratio BLE Ratio Sum Ratio Lora+ BLE 0.167 0.001 0.168 Limit <1 Limit <1 1.5.4 Simultaneous transmission MPE, LoRa Configuration 2 FCC Operating Mode Lora Ratio BLE Ratio Sum Ratio Lora+ BLE 0.077 0.001 0.101 IC Operating Mode Lora Ratio BLE Ratio Sum Ratio Lora+ BLE 0.169 0.001 0.170 Note: 1. R = 0.2m Limit <1 Limit <1 Result Pass Result Pass Result Pass Result Pass Page 5 of 4PDF Printer / www.bullzip.com / FPG / TUV Rheinland Service GmbH; modified using iText 4.2.2 by 1T3XT, AuthentiDate