{"product_id":"radiomaster-er12-pwm-receiver","title":"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eThe RadioMaster ER12 is a 12-channel PWM receiver designed for larger fixed-wing RC aircraft and installations requiring multiple servos, dedicated power distribution, and comprehensive voltage monitoring. Built on the ExpressLRS platform, it combines dual-band 2.4GHz and Sub-G 900MHz RF technology with amplified PWM outputs and flexible serial connectivity.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith a dedicated XT30 power input, three independent voltage-monitoring channels, and serviceable MMCX antenna connectors, the ER12 is designed to simplify receiver integration in complex aircraft builds while providing the control interfaces and power-monitoring capabilities needed for demanding installations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e\u003cspan\u003eImportant Sales Restriction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Due to current FCC certification restrictions stated by the manufacturer, this product cannot currently be sold or shipped to the United States. Please check local regulatory requirements before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_1_6dd7e4cc-ee9f-42a8-9cf4-100d56495b9d.jpg?v=1789007544\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpressLRS Performance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eLow latency, high reliability, and excellent link quality with flexible configuration options.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Band Gemini-X RF System (2.4GHz + Sub-G 900MHz):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUtilizes both frequency bands to provide enhanced link reliability across a wide range of operating environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12 PWM Outputs + Serial Support:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFull 12-channel PWM output with dedicated bidirectional UART and serial interfaces for system integration and expansion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eXT30 Dedicated Power Input:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eProvides stable, high-current power delivery for demanding servo systems and larger aircraft installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePWM Signal Amplification:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAmplified PWM outputs help maintain signal quality over long servo leads and extension cables. They also improve compatibility with larger, high-torque servos, helping ensure reliable control signal delivery throughout the aircraft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent Multi-Source Voltage Telemetry:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eMonitor up to three power sources simultaneously using dedicated ADC channels: EXT-V (up to 70V), receiver supply voltage (V-PWM) (up to 12V), and XT30 input voltage (up to 12V).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal UART Port:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDedicated interface for telemetry, external devices, and system expansion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWi-Fi Updates \u0026amp; WebUI:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eConfigure settings and perform firmware updates wirelessly without disassembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust MMCX Antenna Connectors:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSecure, serviceable antenna connections for easy maintenance and long-term reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Injection-Molded Housing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eProvides consistent protection and structural durability for demanding installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDesigned as a PWM receiver for large fixed-wing aircraft, especially where multiple servos and higher current loads are involved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eCompatible with all ExpressLRS transmitters and modules, including radios with built-in ELRS.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBuilt on the ExpressLRS platform and equipped with dual Semtech LR1121 transceivers, the ER12 utilizes a dual-band Gemini X RF architecture operating on both 2.4 GHz and Sub-G 900 MHz. The result is a stable, consistent control link across a wide range of operating environments, with an architecture that prioritizes dependable operation.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_2_8bac902b-0a01-4748-b229-f4737c522606.jpg?v=1789007544\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_3.jpg?v=1789007545\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_4.jpg?v=1789007544\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe ER12 uses amplified PWM outputs to help maintain reliable servo signals over long leads and extension cables commonly used in larger aircraft. The amplified outputs also help ensure clean and consistent signals when operating larger, high-torque servos that place greater demands on the control system. The receiver also features three independent voltage telemetry channels with dedicated ADCs, allowing simultaneous monitoring of the receiver supply voltage (V-PWM) (up to 12V), the XT30 power input (up to 12V), and an EXT-V input for monitoring external battery voltages up to 70V. Serial connectivity is available via a dedicated 4-pin JST-GH locking UART\/CRSF port for telemetry devices and other serial peripherals.\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_5.jpg?v=1789007545\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_6.jpg?v=1789007545\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_7.jpg?v=1789007544\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_8.jpg?v=1789007544\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003c\/p\u003e\n\u003cp\u003eFrom installation to operation, the ER12 focuses on practicality, with a clean PCB layout to reduce interference, MMCX antenna connectors for easy serviceability, and a durable injection-molded housing built for long-term use. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_9.jpg?v=1789007545\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/EN_PC_10.jpg?v=1789007545\" alt=\"ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"text-decoration: underline; color: rgb(255, 128, 0);\"\u003e\u003cstrong\u003e⚠️ XT30 Power Input Notice\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eXT30 Power Input:\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 3 []\"\u003e\u003cspan\u003eThe XT30 input supplies battery voltage directly to the receiver and PWM power rail. The output voltage follows the applied input voltage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUse only servos rated for the actual voltage supplied to the PWM rail.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWhen using a 2S LiPo\/Li-ion battery through the XT30 input, verify that all connected servos and equipment support the resulting voltage.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eStandard 5V servos must be powered from a suitable regulated 5V supply or the designated standard servo power input, as appropriate for the installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWhen the XT30 input powers the receiver and servos, disconnect the ESC's 5V\/BEC power wire to prevent back-feeding and potential damage.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEXT-V Power Input:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eThe EXT-V input uses a 2-pin JST-GH connector for external battery-voltage monitoring. Connect the red wire to the positive (+) terminal of the battery or ESC according to the official wiring instructions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe EXT-V input is intended for voltage monitoring. Do not use it as the receiver's main power input.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBefore powering the system, verify the wiring, input voltage, servo voltage ratings, and the official receiver wiring diagram.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/h4\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eItem\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eDC 5.0 – 12.0V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eWireless Protocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eExpressLRS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eOutput Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003e12CH PWM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eSerial Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eCRSF \/ SBUS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eTelemetry Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eUp to 100mW (adjustable via LUA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eVoltage Detection Range (EXT-V)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eDC 4.0 – 70V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eBus Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eCRSF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eAntenna\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003e25 cm high-sensitivity, MMCX connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003e22.5 g (without antenna)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003e51.0 × 37.6 × 14.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eFirmware Target\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eRadioMaster Dual 2.4GHz\/900MHz Receiver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eDevice Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eER12 Dual Band True Diversity + 12×PWM RX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px; white-space: nowrap;\"\u003e\u003cstrong\u003eELRS FW Version\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #000; padding: 8px;\"\u003eRequires version 4.1.0 or Higher\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"mysite","offers":[{"title":"LBT","offer_id":47873558937771,"sku":"BR0157.0142","price":59.99,"currency_code":"USD","in_stock":true},{"title":"International","offer_id":48349228630187,"sku":null,"price":59.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/9191\/0315\/files\/imgi_118_ER12-1_f0f8561c-b649-44b0-aad4-d1e1eed72cc3.jpg?v=1789635828","url":"https:\/\/begreatrchobbystore.com\/products\/radiomaster-er12-pwm-receiver","provider":"Begreat RC Hobby","version":"1.0","type":"link"}