BAYCKRC C3 Dual Band Gemini ELRS Receiver (TCXO)

Oh good, another receiver that claims to change your life. Except this one actually might. The BAYCKRC C3 Gemini RX is an absolute unit of a flight controller companion, packing dual LR1121 RF chips and a TCXO into a 1.6g footprint. We've seen a lot of FPV tech over the last decade, but true dual-band ExpressLRS capability on the 868/900MHz and 2.4GHz frequencies simultaneously? That's not marketing fluff; that's a radio link that refuses to drop, even when you're flying behind a concrete block of flats. If you're sick of your 5-inch falling out of the sky on long-range missions, this tiny blue menace is the upgrade your quad has been begging for.

Highlights

• True Dual-Band Gemini Design: Utilizes two separate RF chains for simultaneous 868/900MHz and 2.4GHz transmission. Redundancy is king.
• TCXO Stability: Temperature-compensated crystal oscillator means your frequency stays locked tight whether you're flying in the freezing British winter or a heatwave.
• Punchy 100mW Output: 2x 100mW TX power ensures your link stays robust without cooking the silicon.
• Featherweight Champion: Weighs a negligible 1.6g. You literally have no excuse not to put this on your next micro long-range build.

Why You Want It

If you are pushing max range, fighting through noise floors at the local raceway, or just want a link that feels like an invisible tether, the C3 is the answer. Standard receivers tap out when the multipath interference gets heavy. The Gemini architecture uses cross-band redundancy to dominate environments where standard ELRS receivers cry and disconnect. It’s tiny, it’s reliable, and it runs on the bulletproof ESP32-C3 platform.

Specs

• Model: BAYCKRC C3 900/2400 Dual Band 100mW Gemini RX
• RF Frequency: 868MHz / 900MHz / 2.4GHz
• IC / Processor: 2x LR1121 + ESP32-C3 + TCXO
• TX Power: 2x 100mW @ 868MHz/900MHz/2.4GHz
• Input Power: 3.6V - 5.5V
• Weight: 1.6g (receiver board only)
• Dimensions: 17mm x 26.5mm
• Connector: 2x IPEX 1
• Color: Blue (because red goes faster, but blue locks in tighter)
• Firmware: BAYCKRC C3 900/2400 Dual Band 100mW Gemini RX

FAQ

What makes a Gemini receiver better for long-range FPV?

Gemini receivers use two separate RF chips to receive on two different frequency bands (e.g., 900MHz and 2.4GHz) at the exact same time. If one frequency gets blocked by interference, the other maintains the link, drastically reducing the chance of a failsafe.

Can I run standard ExpressLRS firmware on this?

You must flash the specific BAYCKRC C3 Gemini firmware target via the ExpressLRS configurator to ensure both RF chips operate correctly. Do not flash standard single-band firmware unless you want to gimp your hardware.

What antennas do I need for this receiver?

You will need two separate antennas: one tuned for 868/900MHz and one tuned for 2.4GHz, both with standard IPEX 1 connectors. Ensure you connect them to the correct ports.

In the Box

• 1x BAYCKRC C3 Dual Band Gemini Receiver (TCXO)

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