RadioMaster DBR4 Dual-Band Xross Gemini ExpressLRS Receiver
- Exact Model RadioMaster DBR4 Dual-Band Xross Gemini ExpressLRS Receiver
- Protocol & Frequency ExpressLRS Gemini Xrossband; 2.4GHz + FCC 915MHz
- RF Architecture ESP32 with dual Semtech LR1121; four discrete antennas
- Telemetry & Interface Up to 100mW telemetry; CRSF bus; up to 500Hz refresh
- Power DC 4.5–8.4V
- Size & Weight 27.2×27.2mm; 2.7g without / 5.3g with antennas
- Product Summary Dual-band Gemini-X receiver with two LR1121 RF chains and four discrete antennas for robust links.
| Brand | Radiomaster |
|---|---|
| Protocol & Frequency | ExpressLRS Gemini Xrossband; 2.4GHz + FCC 915MHz |
| RF Architecture | ESP32 with dual Semtech LR1121; four discrete antennas |
| Telemetry & Interface | Up to 100mW telemetry; CRSF bus; up to 500Hz refresh |
| Power | DC 4.5–8.4V |
| Size & Weight | 27.2×27.2mm; 2.7g without / 5.3g with antennas |
RADIOMASTER | RECEIVER DETAILS
RadioMaster DBR4 Dual-Band Xross Gemini ExpressLRS Receiver
Dual-band Gemini-X receiver with two LR1121 RF chains and four discrete antennas for robust links.
Receiver overview
RadioMaster DBR4 Dual-Band Xross Gemini ExpressLRS Receiver is a RadioMaster receiver intended for the radio-control use and configuration stated in its specifications. Dual-band Gemini-X receiver with two LR1121 RF chains and four discrete antennas for robust links.
RadioMaster receiver models can differ in RF band, channel count, diversity architecture and output interface. Check this exact version rather than assuming all ExpressLRS receivers work identically.
Key capabilities
ExpressLRS Gemini Xrossband; 2.4GHz + FCC 915MHz
ESP32 with dual Semtech LR1121; four discrete antennas
Up to 100mW telemetry; CRSF bus; up to 500Hz refresh
DC 4.5–8.4V
27.2×27.2mm; 2.7g without / 5.3g with antennas
Technical specifications
| Protocol & Frequency | ExpressLRS Gemini Xrossband; 2.4GHz + FCC 915MHz |
|---|---|
| RF Architecture | ESP32 with dual Semtech LR1121; four discrete antennas |
| Telemetry & Interface | Up to 100mW telemetry; CRSF bus; up to 500Hz refresh |
| Power | DC 4.5–8.4V |
| Size & Weight | 27.2×27.2mm; 2.7g without / 5.3g with antennas |
Radio and installation compatibility
Dual-band or Gemini-X operation requires a compatible transmitter/module and antennas for the supported RF bands. Confirm receiver firmware and radio hardware before installation.
Install antennas away from carbon shielding and high-current wiring. Perform a safe bind, telemetry and failsafe test before relying on the link in operation.
Before ordering this receiver
- Confirm the exact model, RF band and hardware revision.
- Match ExpressLRS firmware and the radio module configuration.
- Check whether PWM, CRSF or a dedicated gimbal connection is required.
- Confirm package antenna type, plug and mounting clearance.
Radiomaster
Explore the technology behind your next build.
Discover Radiomaster
RadioMaster designs radio-control hardware for hobby pilots and FPV builders, including transmitters, receiver modules and accessories built around modern control links. The range covers compact portable radios as well as feature-rich controllers with configurable switches, sticks and supported radio systems.
Radio selection is about ergonomics and the complete signal chain. ExpressLRS band, internal module version, receiver protocol, external module support and firmware configuration all affect compatibility. A well-matched radio offers comfortable control while leaving room to grow into a broader set of aircraft.
Before buying a RadioMaster transmitter or accessory, check the exact edition, region and radio protocol, plus the batteries or charging arrangement that specific model uses. Choosing the right receiver and updating firmware carefully are essential steps in a dependable setup.
Shipping Information
- Dubai Deliveries: Free one-day delivery within Dubai on business days, with an option for cash on delivery.
- UAE Deliveries: Delivery to other Emirates outside Dubai is available for a flat fee of AED 35, with an estimated delivery time of 2–3 business days. Please contact our team to check availability.
- International Deliveries: Shipping to GCC countries, the Middle East, and Africa is available upon prior arrangement with our support team due to varying import regulations. Customs, clearance fees, and taxes are the buyer's responsibility. For international shipping of additional accessories, all shipping costs, customs duties, and related fees will also be borne by the buyer.
Related products
RadioMaster ER3 PRO PWM Dual-Band Gemini-X ExpressLRS Receiver
- Exact Model RadioMaster ER3 PRO PWM Dual-Band Gemini-X ExpressLRS Receiver
- Protocol & Frequency ExpressLRS Gemini-X; 2.4GHz + Sub-G 900MHz
- Channels & Output 3 PWM channels; CRSF / SBUS serial output
- Telemetry Up to 100mW; receiver and EXT-V monitoring up to 70V
- Power & Antennas DC 5–12V; 25cm high-sensitivity MMCX antennas
- Size & Weight 49.2×26.8×13mm; 13.5g without antennas
- Product Summary Compact three-channel dual-band Gemini-X receiver with full serial and voltage-telemetry support.
RadioMaster ER16 PWM Dual-Band Gemini-X ExpressLRS Receiver
- Exact Model RadioMaster ER16 PWM Dual-Band Gemini-X ExpressLRS Receiver
- Protocol & Frequency ExpressLRS Gemini-X; 2.4GHz + Sub-G 900MHz
- Channels & Output 16 amplified PWM channels; CRSF / SBUS serial output
- Telemetry Up to 100mW; four-source monitoring including EXT-V up to 70V
- Power & Antennas DC 5–12V; dual isolated XT30; 25cm MMCX antennas
- Size & Weight 61.5×43.8×16.8mm; 33g without antennas
- Product Summary Sixteen-channel redundant dual-band Gemini-X receiver for complex large-scale aircraft.
RadioMaster ER12 PWM Dual-Band Gemini-X ExpressLRS Receiver
- Exact Model RadioMaster ER12 PWM Dual-Band Gemini-X ExpressLRS Receiver
- Protocol & Frequency ExpressLRS Gemini-X; 2.4GHz + Sub-G 900MHz
- Channels & Output 12 amplified PWM channels; CRSF / SBUS serial output
- Telemetry Up to 100mW; independent V-PWM, XT30 and EXT-V monitoring up to 70V
- Power & Antennas DC 5–12V; 25cm high-sensitivity MMCX antennas
- Size & Weight 51×37.6×14.5mm; 22.5g without antennas
- Product Summary Twelve-channel dual-band Gemini-X PWM receiver for large fixed-wing aircraft and multi-servo installations.
RadioMaster GR-01 ExpressLRS 2.4GHz Receiver for DJI RS Gimbals
- Exact Model RadioMaster GR-01 ExpressLRS 2.4GHz Receiver for DJI RS Gimbals
- Compatibility & Output DJI RS2 / RS3 Pro gimbals; DJI RS Pro output protocol
- Protocol & Frequency ExpressLRS v3.3.0; 2400–2480MHz
- RF Hardware ESP8285 MCU; Semtech SX1281; replaceable 2.4GHz omni antenna
- Power & Interfaces 5V; NATO port; USB-C; UART/Wi-Fi flashing
- Size & Weight 43×27.7×27.5mm; 18.8g without antenna
- Product Summary Professional ELRS receiver for wireless control of DJI RS2 and RS3 Pro camera gimbals.
RadioMaster Bandit BR3 ExpressLRS 915MHz Receiver
- Exact Model RadioMaster Bandit BR3 ExpressLRS 915MHz Receiver
- Protocol & Frequency ExpressLRS; FCC 915MHz / 868MHz antenna support
- RF Hardware ESP8285 MCU; Semtech SX1276; built-in TCXO
- Telemetry & Interface 100–500mW adjustable telemetry; CRSF; dual IPEX1
- Power & Antennas DC 4.5–8.4V; two 915/868MHz T antennas
- Size & Weight 24×14.2mm; 5.5g with antennas
- Product Summary High-power Sub-G ExpressLRS receiver with dual antennas and up to 500mW telemetry.
RadioMaster Bandit BR1 ExpressLRS 915MHz Receiver
- Exact Model RadioMaster Bandit BR1 ExpressLRS 915MHz Receiver
- Protocol & Frequency ExpressLRS; FCC 915MHz / 868MHz antenna support
- RF Hardware ESP8285 MCU; Semtech SX1276; built-in TCXO
- Telemetry & Interface 50mW / 17dBm telemetry; CRSF; IPEX1
- Power & Antennas DC 5V; T and Y antenna support
- Size & Weight 18×13.8mm; 2.9g with T antenna
- Product Summary Compact 915/868MHz ELRS receiver with TCXO stability and vibration-resistant construction.
RadioMaster RP4TD-M ExpressLRS 2.4GHz Mini True Diversity Receiver
- Exact Model RadioMaster RP4TD-M ExpressLRS 2.4GHz Mini True Diversity Receiver
- Protocol & Frequency ExpressLRS 2.4GHz; 500Hz / F1000Hz
- RF Architecture ESP32 with dual SX1281 true diversity; Gemini compatible
- Telemetry & Interfaces Up to 2×10mW telemetry; CRSF; Wi-Fi updates
- Power & Antennas DC 5V; two 65mm 2.4GHz T antennas
- Size & Weight 18.1×16mm; 1.0g without antennas / 3.3g with antennas
- Product Summary Ultra-light mini true-diversity ExpressLRS receiver for compact builds that need Gemini reliability.
RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver
- Exact Model RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver
- RF Architecture ExpressLRS Gemini / Gemini-X with dual LR1121 RF chains on 2.4GHz and Sub-G 900MHz
- MCU & Updates ESP32D4 with built-in Wi-Fi and WebUI configuration
- Performance Up to 1000Hz refresh rate and up to 100mW telemetry
- Antenna System Dedicated IPEX connectors for 2.4GHz and Sub-G antennas
- Size & Use Approx. 22×18×4mm, 1.7g without antennas; demanding FPV and long-range links
- Product Summary True-diversity Gemini-X receiver for simultaneous 2.4GHz and Sub-G 900MHz operation.
Reviews
There are no reviews yet.