Holybro Zephyr ELRS Gemini X Dual Band Receiver
by Holybro

The Holybro Zephyr ELRS Gemini X Dual Band Receiver (SKU: 17034) is a high-performance ExpressLRS (ELRS) radio control receiver engineered for long-range UAVs, enterprise multirotors, fixed-wing platforms, and performance FPV airframes. Powered by dual Semtech LR1121 transceivers and an ESP32-PICO-D4 processor, the Zephyr operates on the ExpressLRS Gemini X dual-band architecture, transmitting and receiving control packets across both 2.4GHz and Sub-GHz (868/900MHz) spectrums simultaneously.

By deploying true hardware diversity across two independent RF paths, the Zephyr delivers continuous link reliability, multipath rejection, and interference resilience. The module integrates a Temperature Compensated Crystal Oscillator (TCXO) to prevent frequency drift in extreme operating temperatures, a built-in ceramic Wi-Fi antenna for over-the-air firmware upgrades, and dual IPEX1 (U.FL) connectors. Weighing only 2.3 grams without antennas, it provides up to 100mW (20dBm) of telemetry power per band in a compact 16 x 27 x 5 mm footprint.

Key Features

• Dual-Band Gemini X Architecture: Employs dual Semtech LR1121 transceivers to transmit and receive concurrently across both 2.4GHz and 900MHz bands, minimizing packet loss and lockouts.

• True RF Diversity: Features two independent antenna circuits with IPEX1 connectors, maximizing signal reception regardless of aircraft orientation.

• High Telemetry Output (100mW per Band): Supplies up to 20dBm (100mW) of return telemetry power on both 900MHz and 2.4GHz frequencies, extending bidirectional telemetry range.

• Integrated TCXO: Equipped with a precision Temperature Compensated Crystal Oscillator to maintain frequency stability in severe cold or high thermal environments.

• Onboard Wi-Fi Connectivity: Integrated ceramic Wi-Fi antenna allows direct web-browser firmware flashing, parameter configuration, and binding without external programming tools.

• Ultralight 2.3g Profile: Minimal weight impact makes it suitable for micro quadcopters, long-range fixed wings, and weight-sensitive autonomous platforms.

Technical Specifications

• Brand / Manufacturer: Holybro

• Model Identifier: Zephyr ELRS Gemini X Dual Band Receiver

• Manufacturer SKU / Part Number: 17034

• Main Processor (MCU): ESP32-PICO-D4

• RF Transceiver Chipset: 2x Semtech LR1121

• Operating Frequency Bands: Dual-Band (902–928MHz / 868MHz and 2400–2500MHz)

• Telemetry Output Power (900MHz): Max 100mW (20dBm)

• Telemetry Output Power (2.4GHz): Max 100mW (20dBm)

• Receiver Refresh Rates: 50Hz to 500Hz

• RF Modulation: LoRa, FSK

• Oscillator Type: Integrated TCXO

• Antenna Gain: 3 ± 1 dBi

• Antenna SWR: < 1.5

• Antenna Connectors: 2x IPEX1 (U.FL)

• Flight Controller Interface: JST-SH 1.0mm 4-Pin Connector (CRSF: 5V, GND, TX, RX)

• Input Voltage Range: 4.0V – 7.0V DC

• Current Consumption: 5V / 350mA (Max)

• Dimensions (w/o antenna): 16 mm x 27 mm x 5 mm

• Weight (w/o antenna): 2.3 grams

• Weight (with dual T-antennas): ~11.0 grams

What Is Included

• (1) Holybro Zephyr ELRS Gemini X Receiver Module (SKU: 17034)

• (2) Dual-Band 2.4GHz / 900MHz T-Antennas (IPEX1)

• (1) JST-SH 1.0mm 4-Pin Flight Controller Connection Cable

• (1) Clear Protective Heat Shrink Tube