The **BL-R413G** is a low-cost, highly integrated IEEE 802.11 b/g/n WLAN (Wireless Local Area Network) module. It is commonly used in consumer electronics to provide Wi-Fi connectivity via a simple USB 2.0 interface. ### 1. Key Technical Specifications The following table summarizes the primary electronic characteristics of the module: | Feature | Specification | | :--- | :--- | | **Main Chipset** | Realtek RTL8188FTV / RTL8188ETV | | **Host Interface** | USB 2.0 (High Speed) | | **Wi-Fi Standard** | IEEE 802.11b, IEEE 802.11g, IEEE 802.11n | | **Frequency Range** | 2.400GHz ~ 2.4835GHz | | **Data Rate** | Up to 150Mbps (1T1R) | | **Operating Voltage** | 3.3V DC +/- 10% | | **Antenna Type** | External (usually via a solder pad or IPEX connector) | --- ### 2. Core Electronic Components The module is composed of several critical subsystems integrated into a small PCB footprint: * **RF Transceiver (RTL8188 series):** This is the "brain" of the module. It handles the Physical Layer (PHY) and Media Access Control (MAC). It manages the conversion between digital data and radio frequency signals. * **Crystal Oscillator:** Typically a 40MHz crystal that provides the clock signal necessary for the timing of the Wi-Fi radio and the USB interface. * **Low-Pass Filters (LPF) & Band-Pass Filters (BPF):** These passive components ensure that the radio signals stay within the allocated 2.4GHz spectrum and minimize electromagnetic interference (EMI). * **Power Management Unit (PMU):** Integrated circuits that regulate the 3.3V input to lower voltages required by the internal logic of the chipset. --- ### 3. Pinout and Integration Integration into a host PCB (like a Smart TV box or IP Camera) usually involves 4 to 6 main pins: 1. **VDD (3.3V):** Power supply input. 2. **USB_D-:** USB Differential Data Negative. 3. **USB_D+:** USB Differential Data Positive. 4. **GND:** Ground. 5. **RF_ANT:** Output for the Wi-Fi antenna. 6. **CHIP_EN (Optional):** Enable/Reset pin to power down the module for energy saving. --- ### 4. RF Performance Details | Mode | Output Power (Typical) | Sensitivity | | :--- | :--- | :--- | | **802.11b** | 17dBm ± 1.5dB | -80dBm @ 11Mbps | | **802.11g** | 14dBm ± 1.5dB | -70dBm @ 54Mbps | | **802.11n** | 13dBm ± 1.5dB | -64dBm @ MCS7 |