Holybro Zephyr ELRS Gemini X Dual-Band Receiver (2.4GHz/915MHz)

The Holybro Zephyr is an ExpressLRS (ELRS) Gemini X receiver with two Semtech LR1121 radios for true-diversity reception, configurable for 915 MHz sub-GHz or 2.4 GHz LoRa operation. At 2.3 g it suits FPV quads, long-range builds, fixed-wings and Pixhawk-based UAVs that need a stable control and telemetry link.

Key features

• Dual LR1121 transceivers with an ESP32-PICO-D4 processor for Gemini true-diversity reception
• Covers 902–928 MHz and 2400–2500 MHz, so one receiver serves either a sub-GHz long-range setup or a 2.4 GHz setup
• Telemetry output up to 100 mW (20 dBm) on either band
• TCXO for frequency stability; packet rates from 50 Hz to 500 Hz
• Built-in Wi-Fi antenna for wireless firmware updates; two dual-band T-antennas on IPEX1 connectors included

Specifications

• Processor: ESP32-PICO-D4
• RF chips: 2 x Semtech LR1121
• Frequency ranges: 902–928 MHz and 2400–2500 MHz
• Telemetry power: 100 mW (20 dBm) max per band
• Packet rate: 50–500 Hz
• Modulation: LoRa, FSK
• Antennas: dual-band T-antenna, 3 ±1 dBi, IPEX1 (U.FL)
• Input voltage: 4–7 V DC
• Current: 350 mA max at 5 V
• Signal connector: SH1.0 4-pin
• Dimensions: 16 x 27 x 5 mm (without antennas)
• Weight: 2.3 g without antennas, 11 g with
• In the box: receiver, 2 x dual-band T-antennas, SH1.0 4-pin cable, heat-shrink tube

Pair it with an ELRS transmitter on the band you plan to fly and a matching firmware version. Wire it to a spare flight-controller UART and a 5 V pad, and keep the two antennas apart and pointing in different directions to get the most from diversity.