EFR32BG13 2.4 GHz 10 dBm Radio Board BRD4104A Reference Manual The BRD4104A Blue Gecko Radio Board enables developers to develop Bluetooth(R) low energy and proprietary wireless wireless applications. The board contains a 2.4 GHz Blue Gecko Wireless System on Chip and it optimized for operating at 10 dBm output power. Radiated and conducted testing is supported with the on-board printed antenna and UFL connector. The BRD4104A Blue Gecko Radio Board plugs into the Wireless Starter Kit Mainboard, which is provided with the Blue Gecko Starter Kit and gives access to display, buttons and additional features from Expansion Boards. With the supporting Simplicity Studio suite of tools, developers can take advantage of graphical wireless application development; BGScript for Python-like scripting; and visual energy profiling and optimization. The board also serves as an RF reference design for applications targeting 2.4 GHz wireless operation with 10 dBm output power. This document contains brief introduction and description of the BRD4104A Radio Board features focusing on the RF sections and performance. silabs.com | Smart. Connected. Energy-friendly. RADIO BOARD FEATURES * Wireless SoC: EFR32BG13P632F512GM48 * CPU core: ARM Cortex(R)-M4 with FPU * Flash memory: 512 kB * RAM: 64 kB * Operation frequency: 2.4 GHz * Transmit power: 10 dBm * Integrated PCB antenna, UFL connector (optional). * Crystals for LFXO and HFXO: 32.768 kHz and 38.4 MHz. Rev. 1.0 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Radio Board Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2 Radio Board Connector Pin Associations. . . . . . . . . . . . . . . . . . . . . 2 3. Radio Board Block Summary . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2 Radio Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.3 Radio Board Block Description . 3.3.1 Wireless MCU . . . . . . 3.3.2 LF Crystal Oscillator (LFXO) . 3.3.3 HF Crystal Oscillator (HFXO) . 3.3.4 Matching Network for 2.4 GHz. 3.3.5 UFL Connector . . . . . . 3.3.6 Radio Board Connectors . . 3.3.7 Inverted-F Antenna . . . . 3.3.8 Serial Flash . . . . . . . 3.3.9 Serial EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 3 3 3 4 4 4 4 4 4. RF Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.2 Schematic of the RF Matching Network . . 4.2.1 Description of the 2.4 GHz RF Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . 5 4.3 RF Section Power Supply . . . . . . . . . . . . . . . . . . . 5 4.4 Bill of Materials for the 2.4 GHz Matching . . . . . . . . . . . . . . . . . . . . 5 4.5 Inverted-F Antenna . . . . . . . . . . . . . . . . . . . . . 6 . . . . . . . . . . . . . . . . . . 5. Mechanical Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6. EMC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.2 EMC Regulations for 2.4 GHz . . . . . . . . . . . . . 6.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band 6.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band. . . 6.2.3 Applied Emission Limits for the 2.4 GHz Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 8 8 7. RF Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.1 Conducted Power Measurements . . . . . . 7.1.1 Conducted Measurements in the 2.4 GHz band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 . 9 7.2 Radiated Power Measurements . . . . . . 7.2.1 Radiated Measurements in the 2.4 GHz band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 .10 . . 8. EMC Compliance Recommendations . . . . . . . . . . . . . . . . . . . . . .11 8.1 Recommendations for 2.4 GHz ETSI EN 300-328 compliance silabs.com | Smart. Connected. Energy-friendly. . . . . . . . . . . . . .11 Rev. 1.0 8.2 Recommendations for 2.4 GHz FCC 15.247 compliance . .11 9. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . 12 10. Board Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . 13 11. Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 silabs.com | Smart. Connected. Energy-friendly. . . . . . . . . . . . . . Rev. 1.0 BRD4104A Reference Manual Introduction 1. Introduction The EFR32 Blue Gecko Radio Boards provide a development platform (together with the Wireless Starter Kit Mainboard) for the Silicon Labs EFR32 Blue Gecko Wireless System on Chips and serve as reference designs for the matching network of the RF interface. The BRD4104A Radio Board is designed to operate in the 2400-2483.5 MHz band with the RF matching network optimized for operating at 10 dBm output power. To develop and/or evaluate the EFR32 Blue Gecko, the BRD4104A Radio Board can be connected to the Wireless Starter Kit Mainboard to get access to display, buttons and additional features from Expansion Boards and also to evaluate the performance of the RF interface. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 1 BRD4104A Reference Manual Radio Board Connector 2. Radio Board Connector 2.1 Introduction The board-to-board connector scheme allows access to all EFR32BG13 GPIO pins as well as the RESETn signal. For more information on the functions of the available pins, see the EFR32BG13 data sheet. 2.2 Radio Board Connector Pin Associations The figure below shows the mapping between the connector and the EFR32BG13 pins and their function on the Wireless Starter Kit Mainboard. P200 Upper Row 3v3 UIF_BUTTON1 / PF7 / P36 NC / P38 NC / P40 NC / P42 NC / P44 DEBUG.TMS_SWDIO / PF1 / F0 DEBUG.TDO_SWO / PF2 / F2 DEBUG.RESET / RADIO_#RESET / F4 VCOM.TX_MOSI / PA0 / F6 VCOM.#CTS_SCLK / PA2 / F8 UIF1_LED0 / PF4 / F10 UIF_BUTTON0 / PF6 / F12 DISP_ENABLE / PD15 / F14 DISP_SI / PC6 / F16 DISP_EXTCOMIN / PD13 / F18 PTI.DATA / PB12 / F20 USB_VBUS 5V Board ID SCL P201 Lower Row GND GND P37 / PD15 / SENSOR_ENABLE VCOM.#CTS_SCLK / PA2 / P0 VCOM.#RTS_#CS / PA3 / P2 P39 / NC PD10 / P4 P41 / NC PD11 / P6 P43 / NC PD12 / P8 P45 / NC DEBUG.TDI / PF3 / P10 F1 / PF0 / DEBUG.TCK_SWCLK PC10 / P12 F3 / PF3 / DEBUG.TDI PA4 / P14 F5 / PA5 / VCOM_ENABLE VCOM_ENABLE / PA5 / P16 F7 / PA1 / VCOM.RX_MISO PTI.CLK / PB11 / P18 F9 / PA3 / VCOM.#RTS_#CS PTI.DATA / PB12 / P20 F11 / PF5 / UIF_LED1 PTI.SYNC / PB13 / P22 F13 / PF7 / UIF_BUTTON1 DEBUG.TCK_SWCLK / PF0 / P24 F15 / PC8 / DISP_SCLK DEBUG.TMS_SWDIO / PF1 / P26 F17 / PD14 / DISP_SCS DEBUG.TDO_SWO / PF2 / P28 F19 / PB13 / PTI.SYNC UIF_LED0 / PF4 / P30 F21 / PB11 / PTI.CLK UIF_LED1 / PF5 / P32 USB_VREG UIF_BUTTON0 / PF6 / P34 GND GND Board ID SDA VMCU_IN P1 / PC6 / DISP_SI P3 / PC7 P5 / PC8 / DISP_SCLK P7 / PC9 P9 / PA0 / VCOM.TX_MOSI P11 / PA1 / VCOM.RX_MISO P13 / PC11 P15 / NC P17 / NC P19 / NC P21 / NC P23 / NC P25 / NC P27 / NC P29 / NC P31 / PD13 / DISP_EXTCOMIN P33 / PD14 / DISP_SCS P35 / PD15 / DISP_ENABLE VRF_IN Figure 2.1. BRD4104A Radio Board Connector Pin Mapping silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 2 BRD4104A Reference Manual Radio Board Block Summary 3. Radio Board Block Summary 3.1 Introduction This section gives a short introduction to the blocks of the BRD4104A Radio Board. 3.2 Radio Board Block Diagram The block diagram of the BRD4104A Radio Board is shown in the figure below. I2C UFL Connector 2.4 GHz RF GPIO UART Debug EFR32 EFR32 Wireless SoC AEM Packet Trace 2.4 GHz RF Inverted-F PCB Antenna SPI SPI I2C Radio Board Connectors 2.4 GHz RF Matching Network & Path Selection 24AA024 8 Mbit MX25R Serial EEPROM Serial Flash 32 8k .76 LF Crystal .4M 38 HF Crystal Figure 3.1. BRD4104A Block Diagram 3.3 Radio Board Block Description 3.3.1 Wireless MCU The BRD4104A Blue Gecko Radio Board incorporates an EFR32BG13P632F512GM48 Wireless System on Chip featuring 32-bit Cortex(R)-M4 with FPU core, 512 kB of flash memory, 64 kB of RAM and a 2.4 GHz band transceiver with output power up to 10 dBm. For additional information on the EFR32BG13P632F512GM48, refer to the EFR32BG13 Data Sheet. 3.3.2 LF Crystal Oscillator (LFXO) The BRD4104A Radio Board has a 32.768 kHz crystal mounted. For details regarding the crystal configuration, refer to Application Note AN0016: Oscillator Design Considerations. 3.3.3 HF Crystal Oscillator (HFXO) The BRD4104A Radio Board has a 38.4 MHz crystal mounted. For details regarding the crystal configuration, refer to Application Note AN0016: Oscillator Design Considerations. 3.3.4 Matching Network for 2.4 GHz The BRD4104A Radio Board incorporates a 2.4 GHz matching network which connects the 2.4 GHz RF input/output of the EFR32BG13 to the one on-board printed Inverted-F antenna. The component values were optimized for the 2.4 GHz band RF performace and current consumption with 10 dBm output power. For detailed description of the matching network, see Chapter 4.2.1 Description of the 2.4 GHz RF Matching. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 3 BRD4104A Reference Manual Radio Board Block Summary 3.3.5 UFL Connector To be able to perform conducted measurements Silicon Labs added an UFL connector to the Radio Board. The connector allows an external 50 Ohm cable or antenna to be connected during design verification or testing. Note: By default the output of the matching network is connected to the printed Inverted-F antenna by a series component. It can be connected to the UFL connector as well through a series 0 Ohm resistor which is not mounted by default. For conducted measurements through the UFL connector the series component to the antenna should be removed and the 0 Ohm resistor should be mounted (see Chapter 4.2 Schematic of the RF Matching Network for further details). 3.3.6 Radio Board Connectors Two dual-row, 0.05" pitch polarized connectors make up the BRD4104A Radio Board interface to the Wireless Starter Kit Mainboard. For more information on the pin mapping between the EFR32BG13P632F512GM48 and the Radio Board Connector, refer to Chapter 2.2 Radio Board Connector Pin Associations. 3.3.7 Inverted-F Antenna The BRD4104A Radio Board includes a printed inverted-F antenna (IFA) tuned to have close to 50 Ohm impedance at the 2.4 GHz band. For detailed description of the antenna see Chapter 4.5 Inverted-F Antenna. 3.3.8 Serial Flash The BRD4104A Radio Board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the EFR32BG13. For additional information on the pin mapping see the schematic of the BRD4104A. 3.3.9 Serial EEPROM The BRD4104A Radio Board is equipped with a serial I2C EEPROM for board identification and to store additional board related information. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 4 BRD4104A Reference Manual RF Section 4. RF Section 4.1 Introduction This section gives a short introduction to the RF section of the BRD4104A Radio Board. 4.2 Schematic of the RF Matching Network The schematic of the RF section of the BRD4104A Radio Board is shown in the following figure. 2.4 GHz Matching Network U1B EFR32 L1 RF Crystal HFXTAL_N 10 HFXTAL_P 11 HFXI Supply Filtering L102 HFXO 2 BLM18AG601SN1 9 C102 C103 100P 10P 0R INVERTED_F 16 GND RF Analog Power 1 2G4RF_ION Inverted-F Antenna 17 C1 VDCDC AT1 L2 R1 RF I/O 2G4RF_IOP Antenna Tuning Component 2.4 GHz Path Selection PAVDD RFVDD L103 Ground RFVSS 14 R2 PA Power 1 2 18 BLM18AG601SN1 C106 PAVSS 15 2 0R NM 10P U.FL UFL GND Connector GND GND 3 1 C107 220N GND PAVDD P1 Figure 4.1. Schematic of the RF Section of the BRD4104A 4.2.1 Description of the 2.4 GHz RF Matching The 2.4 GHz matching connects the 2G4RF_IOP pin to the on-board printed Inverted-F Antenna. The 2G4RF_ION pin is connected to ground. For lower output powers (under 13 dBm) additional harmonic filtering is not required as the harmonic levels are below the regulation limits (see Chapter 7.1 Conducted Power Measurements). Therefore, the matching network comprises only a two-element impedance matching circuitry. The targeted output power is 10 dBm. For for conducted measurements the output of the matching network can also be connected to the UFL connector by removing the series R1 resistor between the antenna and the output of the matching and adding a 0 Ohm resistor to the R2 resistor position between the output of the matching and the UFL connector. 4.3 RF Section Power Supply On the BRD4104A Radio Board the power supply pins of the RF section (RFVDD, PAVDD) are directly connected to the output of the on-chip DC-DC converter. This way, by default, the DC-DC converter provides 1.8 V for the entire RF section (for details, see the schematic of the BRD4104A). 4.4 Bill of Materials for the 2.4 GHz Matching The Bill of Materials of the 2.4 GHz matching network of the BRD4104A Radio Board is shown in the following table. Table 4.1. Bill of Materials for the BRD4104A 2.4GHz RF Matching Network Component name Value Manufacturer Part Number L1 1.9 nH Murata LQP15MN1N9W02D C1 1.5 pF Murata GRM1555C1H1R05WA01D silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 5 BRD4104A Reference Manual RF Section 4.5 Inverted-F Antenna The BRD4104A Radio Board includes an on-board printed inverted-F antenna tuned for the 2.4 GHz band. Due to the design restrictions of the Radio Board, the input of the antenna and the output of the matching network can't be placed directly next to each other. As a result, a 50 Ohm transmission line was necessary to connect them. With the actual line length the impedance of the antenna at the double-harmonic frequency is transformed closer to a critical impedance range. This reduces the low-pass filter effect of the matching network resulting in the increase of the radiated level of the harmonic. To reduce the harmonic radiation a tuning component was used between the matching network output and the antenna input. For the actual Radio Board design (with the actual transmission line length) a small value inductor was used (L2 inductor with value of 1.9 nH) to transform the impedance at the double-frequency harmonic away from the critical region while keeping the impedance at the funamental close to 50 Ohm. With this the suppression of the radiated double-frequency harmonic increases by approximately 12 dB. The resulting impedance is shown in the following figure. Figure 4.2. Impedance and Reflection of the Inverted-F Antenna of the BRD4104A Board Measured from the Matching Output Note: The suppression of the double-frequency harmonic can be further increased by using a sligthly higher inductor value but for the current board the suppression achieved with 1.9 nH is sufficient (see Chapter 7.2 Radiated Power Measurements). Therefore, for BOM cost reduction the same value and type of inductor was used as the one in the 2.4 GHz matching network (L1). silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 6 BRD4104A Reference Manual Mechanical Details 5. Mechanical Details The BRD4104A Radio Board is illustrated in the figures below. DC-DC Inductor DC-DC & Supply Filter Caps. EFR32xx Antenna Tuning Component 30 mm Serial Flash Frame of the Optional Shielding Can 2.4 GHz Path Selection 45 mm Figure 5.1. BRD4104A Top View 24 mm 5 mm Display Enable Selection Board Identification 27.3 mm 28.6 mm PAVDD Supply Selection 15 mm Interface Connector WSTK Sensor Enable Selection Interface Connector Figure 5.2. BRD4104A Bottom View silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 7 BRD4104A Reference Manual EMC Compliance 6. EMC Compliance 6.1 Introduction Compliance of the fundamental and harmonic levels of the BRD4104A Radio Board is tested against the following standards: * 2.4 GHz: * ETSI EN 300-328 * FCC 15.247 6.2 EMC Regulations for 2.4 GHz 6.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band Based on ETSI EN 300-328 the allowed maximum fundamental power for the 2400-2483.5 MHz band is 20 dBm EIRP. For the unwanted emissions in the 1 GHz to 12.75 GHz domain the specified limit is -30 dBm EIRP. 6.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band FCC 15.247 allows conducted output power up to 1 Watt (30 dBm) in the 2400-2483.5 MHz band. For spurious emmissions the limit is -20 dBc based on either conducted or radiated measurement, if the emission is not in a restricted band. The restricted bands are specified in FCC 15.205. In these bands the spurious emission levels must meet the levels set out in FCC 15.209. In the range from 960 MHz to the frequency of the 5th harmonic it is defined as 0.5 mV/m at 3 m distance which equals to -41.2 dBm in EIRP. Additionally, for spurious frequencies above 1 GHz, FCC 15.35 allows duty-cycle relaxation to the regulatory limits. For the EmberZNet PRO the relaxation is 3.6 dB. Therefore, the -41.2 dBm limit can be modified to -37.6 dBm. If operating in the 2400-2483.5 MHz band the 2nd, 3rd and 5th harmonics can fall into restricted bands. As a result, for those the -37.6 dBm limit should be applied. For the 4th harmonic the -20 dBc limit should be applied. 6.2.3 Applied Emission Limits for the 2.4 GHz Band The above ETSI limits are applied both for conducted and radiated measurements. The FCC restricted band limits are radiated limits only. Besides that, Silicon Labs applies those to the conducted spectrum i.e. it is assumed that, in case of a custom board, an antenna is used which has 0 dB gain at the fundamental and the harmonic frequencies. In that theoretical case, based on the conducted measurement, the compliance with the radiated limits can be estimated. The overall applied limits are shown in the table below. Table 6.1. Applied Limits for Spurious Emissions for the 2.4 GHz Band Harmonic Frequency Limit 2nd 4800~4967 MHz -37.6 dBm 3rd 7200~7450.5 MHz -37.6 dBm 4th 9600~9934 MHz -30 dBm 5th 12000~12417.5 MHz -37.6 dBm silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 8 BRD4104A Reference Manual RF Performance 7. RF Performance 7.1 Conducted Power Measurements During measurements, the BRD4104A Radio Board was attached to a Wireless Starter Kit Mainboard which was supplied by USB. The voltage supply for the Radio Board was 3.3 V. 7.1.1 Conducted Measurements in the 2.4 GHz band The BRD4104A Radio Board was connected directly to a Spectrum Analyzer through its UFL connector (the R1 resistor was removed and a 0 Ohm resistor was soldered to the R2 resistor position). The supply for the RF section (RFVDD) and the 2.4 GHz power amplifier (PAVDD) was 1.8 V provided by the on-chip DC-DC converter; for details, see the schematic of the BRD4104A. The transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 10 dBm. The typical output spectrum is shown in the following figure. Figure 7.1. Typical Output Spectrum of the BRD4104A As it can be observed, the fundamental is close to 10 dBm and all of the unwanted emissions are under the -37.6 dBm applied limit. Note: The conducted measurement is performed by connecting the on-board UFL connector to a Spectrum Analyzer through an SMA Conversion Adapter (P/N: HRMJ-U.FLP(40)). This connection itself introduces approximately 0.3 dB insertion loss. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 9 BRD4104A Reference Manual RF Performance 7.2 Radiated Power Measurements During measurements, the BRD4104A Radio Board was attached to a Wireless Starter Kit Mainboard which was supplied by USB. The voltage supply for the Radio Board was 3.3 V. The radiated power was measured in an antenna chamber by rotating the board 360 degrees with horizontal and vertical reference antenna polarizations in the XY, XZ and YZ cuts. The measurement planes are shown in the figure below. Figure 7.2. Illustration of reference planes with a Radio Board plugged into the Wireless Starter Kit Mainboard Note: The radiated measurement results presented in this document were recorded in an unlicensed antenna chamber. Also the radiated power levels may change depending on the actual application (PCB size, used antenna, and so on). Therefore, the absolute levels and margins of the final application are recommended to be verified in a licensed EMC testhouse. 7.2.1 Radiated Measurements in the 2.4 GHz band For the transmitter antenna the on-board printed inverted-F antenna of the BRD4104A Radio Board was used (the R1 resistor was mounted). The supply for the RF section (RFVDD) and the 2.4 GHz power amplifier (PAVDD) was 1.8 V provided by the on-chip DC-DC converter; for details, see the schematic of the BRD4104A. The transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 10 dBm based on the conducted measurement. The results are shown in the table below. Table 7.1. Maximums of the measured radiated powers in EIRP [dBm] Frequency EIRP [dBm] Orientation Margin [dB] Limit in EIRP [dBm] Fund 12.9 YZ/V 17.1 30 2nd -56.6 YZ/H 19 -37.6 3rd <-50* -/- >10 -37.6 4th <-50* -/- >10 -30 5th <-50* -/- >10 -37.6 * Signal level is below the Spectrum Analyzer noise floor. As it can be observed, thanks to the high gain of the inverted-F antenna, the level of the fundamental is higher than 10 dBm. The strongest harmonic is the double-frequency one and thanks to the additional suppression provided by the L2 inductor its level is under -50 dBm. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 10 BRD4104A Reference Manual EMC Compliance Recommendations 8. EMC Compliance Recommendations 8.1 Recommendations for 2.4 GHz ETSI EN 300-328 compliance As it was shown in the previous chapter, the radiated power of the fundamental of the BRD4104A Blue Gecko Radio Board complies with the 20 dBm limit of the ETSI EN 300-328 both in case of the conducted and the radiated measurements. The harmonic emissions are under the -30 dBm limit. Although the BRD4104A Radio Board has an option for mounting a shielding can, that is not required for the compliance. 8.2 Recommendations for 2.4 GHz FCC 15.247 compliance As it was shown in the previous chapter, the radiated power of the fundamental of the BRD4104A Blue Gecko Radio Board complies with the 30 dBm limit of the FCC 15.247. The harmonic emissions are under the -37.6 dBm applied limit both in case of the conducted and the radiated measurements. Although the BRD4104A Radio Board has an option for mounting a shielding can, that is not required for the compliance. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 11 BRD4104A Reference Manual Document Revision History 9. Document Revision History Revision 1.0 2017-05-22 Initial document revision. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 12 BRD4104A Reference Manual Board Revision History 10. Board Revision History Table 10.1. BRD4104A Radio Board Revisions Radio Board Revision Description A00 Initial revision. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 13 BRD4104A Reference Manual Errata 11. Errata There are no known errata at present. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 14 Simplicity Studio One-click access to MCU and wireless tools, documentation, software, source code libraries & more. Available for Windows, Mac and Linux! IoT Portfolio www.silabs.com/IoT SW/HW www.silabs.com/simplicity Quality www.silabs.com/quality Support and Community community.silabs.com Disclaimer Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Labs products. 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