BAYCKRC 900/2400 Dual Band Gemini RX User Manual

1. Sissejuhatus

The BAYCKRC 900/2400 Dual Band Gemini RX is a state-of-the-art dual-frequency receiver designed for wireless remote control systems, optimized and developed based on the ExpressLRS open source project. It integrates the LR1121 (Semtech's third-generation transceiver) and supports configurable operation across 150-960MHz (sub-GHz) or 2.4GHz LoRa frequencies. The sub-GHz range is fully compatible with existing ELRS 433/868/900 ranges and offers a robust +100mW output capability. It also supports all 2.4GHz LoRa modes, making it a versatile choice for long-range FPV racing and other remote control applications. Please note that FLRC mode, and 2.4GHz D and F modes are not supported.

The LR1121 transceiver introduces four new RF modes:

• Sub-GHz 250Hz (-111dBm): Specifically tailored for Mavlink users. The data packet rate is twice that of the current 900SX1276 hardware.
• Dual-Band X150Hz (-112dBm): Enables simultaneous sub-GHz and 2.4GHz transmission under Gemini Mode.
• Dual-Band X100Hz Full Spectrum (-112dBm): Provides simultaneous sub-GHz and 2.4GHz transmission under Gemini Mode, covering the full frequency range.
• Dual Band Fusion: Operates under 915Gemini, where the second antenna is dedicated to the 2.4GHz frequency band.

2. Pakendi sisu

Veenduge, et kõik allpool loetletud esemed on teie pakendis olemas:

• 1x BAYCKRC 900/2400 Dual Band Gemini RX Receiver Board
• 2x T-type Antennas (for 900MHz and 2.4GHz operation)
• 1x Connection Wire Set
• BAYCKRC Branding/Stickers

3. Tehnilised andmed

4. Seadistamine ja ühendus

4.1 Component Definition

Familiarize yourself with the various components and connection points on the receiver board:

• RGB indikaatortuli: Annab staatuse tagasisidet.
• Temperature compensated crystal oscillator: Ensures stable frequency operation.
• WiFi antenn: For wireless configuration and updates.
• IPEX 1: Antenna connector type.
• FROUNT / BACK: Indicates orientation.
• LR1121: Main transceiver chip.
• BOOT: Bootloader button/pad.
• Lock socket: Turvaliste ühenduste jaoks.
• ESP32-PICO-D4: Microcontroller.
• HRX, TX, RX, +5V, GND, HGND: Wiring pads for power and data.

4.2 Antenni paigaldamine

The receiver supports self-adaptive antenna configurations. Ensure correct antenna placement based on your desired frequency band:

1. 2.4GHz Operation: When using dual antennas for 2.4GHz, equip two 2.4GHz antennas.
2. 900MHz Operation: When using dual antennas for 900MHz, equip two 900MHz antennas.
3. Dual-Frequency Operation (900MHz + 2.4GHz): For dual-frequency use, connect a 900MHz antenna to the left socket and a 2.4GHz antenna to the right socket.

4.3 Connecting with Flight Controller

There are two primary methods for connecting the receiver to your flight controller:

1. Pandla ühendus: Use the provided buckle connection line to connect to the flight controller. (Note: Some flight controllers, like the DOLPHIN, may come with a double-headed buckle connection line from the factory).
2. Jooteühendus: Solder the connection lines directly. You can choose either method 1 or 2, but do not connect two receivers simultaneously.

Important Wiring Note:

• Receiver RX connects to Flight Controller TX. (Example: For BAYCKRCDOLPHIN, Flight Controller TX is labeled as T1, which is the TX of UART1/Port 1).
• Receiver TX connects to Flight Controller RX. (Example: For BAYCKRCDOLPHIN, Flight Controller RX is labeled as R1, which is the RX of UART1 Port 1).

5. Operating Modes and Compatibility

The BAYCKRC 900/2400 Dual Band Gemini RX supports five distinct reception modes, leveraging its dual-core, dual-band LR1121 RF module:

1. 900MHz Diversity Mode (Dual Antenna True Diversity Mode): Utilized with a 900MHz single-antenna, single-core RF receiver module.
2. 900MHz Gemini Mode (Dual Antenna Gemini Mode): Used with a 900MHz dual-antenna, dual-core RF receiver module.
3. 2.4GHz Diversity Mode (Dual Antenna True Diversity Mode): Utilized with a 2.4GHz single-antenna, single-core RF receiver module.
4. 2.4GHz Gemini Mode (Dual Antenna Gemini Mode): Used with a 2.4GHz dual-antenna, dual-core RF receiver module.
5. 900MHz & 2.4GHz Dual-Band Gemini Mode (Dual Antenna Gemini Mode): Used with a 900MHz & 2.4GHz dual-antenna, dual-core RF receiver module. This mode specifically requires the LR1121 dual-core, dual-band RF receiver module.

5.1 Ühilduvad saatjad

The BAYCKRC 900/2400 Dual Band Gemini RX is compatible with a wide range of ExpressLRS transmitters, including various 2.4GHz and 900MHz modules in Micro, Nano, and Gemini TX form factors. Ensure your transmitter is configured for the appropriate frequency and mode to match the receiver.

6. Veaotsing

• Signaali/sidumisprobleemide puudumine:
  • Veenduge, et nii vastuvõtja kui ka saatja on sisse lülitatud.
  • Verify that the receiver and transmitter are running the same ExpressLRS firmware version.
  • Check that the binding phrase (if used) is identical on both devices.
  • Confirm correct wiring to the flight controller (RX to TX, TX to RX).
  • Ensure antennas are securely connected and correctly oriented for the chosen frequency.
• Katkendlik ühendus:
  • Check for physical obstructions or interference sources near the receiver or antennas.
  • Ensure antennas are not damaged or bent.
  • Consider repositioning antennas for better line-of-sight.
  • Verify power supply to the receiver is stable (3.6V-5.5V).
• Vastuvõtja ei lülitu sisse:
  • Double-check power connections (+5V and GND).
  • Ensure the flight controller is providing power to the receiver.

7. Kasutaja nõuanded

• For optimal performance, always ensure your ExpressLRS firmware on both the receiver and transmitter is up to date.
• When using dual-frequency mode, carefully select and position the 900MHz and 2.4GHz antennas to maximize signal reception for both bands.
• Consider using heat shrink tubing or a protective case for the receiver board to prevent short circuits and physical damage, especially in FPV racing environments.
• Perform range tests in a safe, open area after installation to confirm reliable signal strength before flying.

8. Garantii ja tugi

This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For warranty claims, technical support, or further assistance, please contact your retailer or the manufacturer directly. Keep your proof of purchase for warranty validation.