{"product_id":"src-175-brotherhobby-c3-900-2400-dual-band-100mw-gemini-rx","title":"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX ExpressLRS Receiver (915MHz\/2.4GHz, IPEX1)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eBrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX is an ExpressLRS receiver supporting 915MHz and 2.4GHz operation, designed around dual Semtech LR1121 RF chips, an ESP32-C3 main control chip, and a built-in TCXO for stable frequency performance.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDual-band operation: 915MHz and 2.4GHz (supports sub-GHz and 2.4GHz LoRa)\u003c\/li\u003e\n\u003cli\u003eDual 100mW telemetry power (2 x 100mW)\u003c\/li\u003e\n\u003cli\u003eBuilt-in TCXO (temperature compensated crystal oscillator)\u003c\/li\u003e\n\u003cli\u003eDesigned to receive signals from all directions\u003c\/li\u003e\n\u003cli\u003eDual-band antenna design for 915MHz + 2.4GHz (no need to replace antenna when switching frequency band)\u003c\/li\u003e\n\u003cli\u003eOnboard features\/labels: BOOT, RGB indicator light, IPEX1 socket, lock socket, and pads marked GND \/ 5V \/ TX \/ RX\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eName\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExpressLRS Receiver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRF Freq\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.4GHz \/ 915MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTX Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2*100mw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Power \/ Input Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.6V-5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnector\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIPEX1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.98g (receiver only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18mm*27mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eESP32-C3FH4 + LR1121*2 + TCXO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWiring \u0026amp; Configuration (Betaflight Example)\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWire the receiver to the flight controller: GND to GND, 5V to 5V, TX to FC RX, RX to FC TX.\u003c\/li\u003e\n\u003cli\u003eEnable the corresponding UART (example shown: UART2) as \u003cstrong\u003eSerial RX\u003c\/strong\u003e in Betaflight Configurator under the \u003cstrong\u003ePorts\u003c\/strong\u003e tab.\u003c\/li\u003e\n\u003cli\u003eIn the \u003cstrong\u003eConfiguration\u003c\/strong\u003e tab, set \u003cstrong\u003eReceiver Mode\u003c\/strong\u003e to \u003cstrong\u003eSerial-based receiver\u003c\/strong\u003e and select \u003cstrong\u003eCRSF\u003c\/strong\u003e as the protocol.\u003c\/li\u003e\n\u003cli\u003eTelemetry is optional and may reduce stick update rate due to transmit slots being used for telemetry.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eBinding\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePower on the receiver three times in a row to enter frequency matching mode (indicator light flashes twice).\u003c\/li\u003e\n\u003cli\u003eOn the radio, open the ExpressLRS LUA interface and select \u003cstrong\u003e[BIND]\u003c\/strong\u003e to confirm.\u003c\/li\u003e\n\u003cli\u003eIndicator light stays on constantly when frequency matching is successful.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eIndicator Light Meanings\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eRainbow color gradient: power on self test\u003c\/li\u003e\n\u003cli\u003eGreen and orange lights flash alternately: enter WiFi upgrade mode\u003c\/li\u003e\n\u003cli\u003eRed light flashing fast: no RF chip detected\u003c\/li\u003e\n\u003cli\u003eOrange dual flash: Crossover Mode\u003c\/li\u003e\n\u003cli\u003eOrange triple flash: connected, but does not match the settings in model match\u003c\/li\u003e\n\u003cli\u003eOrange slow flash: waiting for connection\u003c\/li\u003e\n\u003cli\u003eAlways on: connected\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX receiver\u003c\/li\u003e\n\u003cli\u003eUser manual\u003c\/li\u003e\n\u003cli\u003e4*30awg connection line*1\u003c\/li\u003e\n\u003cli\u003eT-Shape Dual Band Antenna*2\u003c\/li\u003e\n\u003cli\u003eTransparent Heat Shrinkable Tubing*2\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor installation or compatibility questions, contact support at support@rcdrone.top or visit https:\/\/rcdrone.top\/.\u003c\/p\u003e\u003ch2 id=\"details\"\u003eDetails\u003c\/h2\u003e\u003cdiv class=\"details-gallery\"\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX.jpg?v=1776875231\"\u003e\u003cp\u003eBrotherHobby C3 900\/2400 dual-band Gemini RX receiver uses a compact board layout with a plug connector and clearly labeled pads for clean wiring.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_5572cea8-935f-4955-ae37-3958c4b41e12.jpg?v=1776875242\"\u003e\u003cp\u003eDual Semtech LR1121 RF chips provide sub‑GHz and 2.4GHz LoRa support with dual 100mW telemetry power.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_34aae699-d224-437e-a85a-50209e151d59.jpg?v=1776875253\"\u003e\u003cp\u003eDual-band Gemini communication uses both 915MHz and 2.4GHz links between the transmitter and receiver for better interference resistance.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_f0054724-b4ec-4a5d-8813-86b2d48b9066.jpg?v=1776875298\"\u003e\u003cp\u003eA built-in TCXO temperature-compensated crystal oscillator helps keep the receiver’s frequency stable across temperature changes.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_a3e0c06e-743c-43df-a1eb-47f111f542a2.jpg?v=1776875310\"\u003e\u003cp\u003eBrotherHobby Gemini RX ExpressLRS receiver uses an ESP32-C3 main control chip and provides GND, 5V, TX, and RX solder pads plus an IPEX1 antenna connector.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_de62a368-7280-4e82-96f2-e033ec69257a.jpg?v=1776875321\"\u003e\u003cp\u003eThe 915MHz and 2.4GHz dual-band antenna supports switching between bands without swapping antennas.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_1bc2b789-740f-4ac0-b32a-ee23df12ca7e.jpg?v=1776875332\"\u003e\u003cp\u003eThe \u003ca href=\"https:\/\/rcdrone.top\/collections\/brotherhobby\" title=\"BrotherHobby\"\u003eBrotherHobby\u003c\/a\u003e C3 900\/2400 Gemini RX supports 915MHz and 2.4GHz with an IPEX1 connector, 3.6–5.5V input, and labeled GND\/5V\/TX\/RX pads for straightforward wiring.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_e5d9123a-0591-4ed8-8eed-587eed64644a.jpg?v=1776875343\"\u003e\u003cp\u003eSerial ExpressLRS receiver setup uses four wires (GND, 5V, TX, RX) to the flight controller and requires enabling a UART Serial RX with CRSF selected in Betaflight.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_3caf584f-7b55-431e-aa7b-f46ce534cf16.jpg?v=1776875354\"\u003e\u003cp\u003eThe ExpressLRS receiver bind guide explains the three-power-cycle frequency match procedure and the indicator LED color meanings for connection and mode status.\u003c\/p\u003e\n\u003cimg alt=\"BrotherHobby C3 900\/2400 Dual Band 100mW Gemini RX\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/BrotherHobby-C3-9002400-Dual-Band-100mW-Gemini-RX_ffab33f0-14b5-45df-acb0-d629821d748e.jpg?v=1776875364\"\u003e\u003cp\u003eBrotherHobby C3 900\/2400 Gemini RX comes with the receiver board, user manual, a 4×30AWG connection lead, two T-shape antennas, and heat-shrink tubing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BrotherHobby","offers":[{"title":"Default Title","offer_id":51965433872608,"sku":"bro-c3-100mw-gemini-rx","price":49.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/dd3aac78b4.jpg?v=1776845334","url":"https:\/\/rcdrone.top\/products\/src-175-brotherhobby-c3-900-2400-dual-band-100mw-gemini-rx","provider":"RCDrone","version":"1.0","type":"link"}