SPECIFICATIONS

Building on the open-source ExpressLRS framework – renowned for delivering ultra-low latency, blistering speeds, and exceptional range – the upgraded Lite Receiver flat antenna V1.2 now features an extra-thin 3mm board, 0.46g ultra-lightweight design and enlarged soldering pads. Optimized impedance matching elevates signal reliability and sensitivity, enabling 300m range at 25mW transmitter power and up to 1000m at 50mW, pushing the boundaries of long-range potential in micro-sized receivers.

• 🚀【Ultra-Compact Size】Only 10x10x6mm. The smallest and lightest ELRS receiver, perfect for weight-sensitive 1S Tiny Whoop builds.

• 📡【Tower Antenna Power】Equipped with a high-gain tower antenna for superior signal penetration and stable long-range control.

• ⚡【Zero Latency Link】ExpressLRS 2.4G protocol ensures the fastest response and lowest latency for competitive drone racing.

• 🛠️【Plug and Play】Pre-flashed with V1.2 firmware. Easy to bind and compatible with all 2.4G ELRS TX modules.

• ✅【Whoop Specialist】Specially optimized for Meteor65, Meteor75, and Cetus series. The ultimate choice for indoor racing enthusiasts.

[Specifications]

• Weight: 0.46g (Flat Antenna V1.2), 0.47g (Tower Antenna)

• Size: 11mm*10mm*3mm (Flat), 10mm*10mm*6mm (Tower)

• MCU: ESP8285

• Telemetry power: 17mW

• Frequency bands: 2.4GHz ISM

• Input voltage: 5V

• Antenna: Integrated SMD ceramic antenna

[Diagram]

Flat antenna 2.4G V1.2:

Enhanced Signal Reliability & Sensitivity

The flat antenna V1.2s optimized impedance matching unlocks a transformative leap in signal reliability and sensitivity. Where the original flat antenna V1.1 achieved 500-600m at 50mW transmitter power/500Hz, the V1.2 now delivers a robust 1000m under identical conditions – alongside superior signal consistency. This precision-tuned design minimizes packet loss during high-speed maneuvers and enhances low-power efficiency, ensuring crisp responsiveness at 25mW (300m range) and unwavering stability at max output.

Lightweight Design, Simplified Installation

Responding to community feedback, the flat antenna V1.2 now features enlarged soldering pads designed to simplify installation and reduce errors – a critical upgrade for novices and seasoned builders alike. Combined with a 13.2% weight reduction (now just 0.46g), the updated design retains its compact footprint while shedding unnecessary mass, freeing up crucial weight budgets for performance-focused builds.Nano RX vs. Lite RX

The Nano Receiver(2.4G version) is the first receiver with power amplifier (PA+LNA), delivering 100mW telemetry output and better sensitivity for longer range. In contrast, the Lite Receiver doesn't have a PA/LNA, so its telemetry power is limited to the SX1280 RF chip's native 17mW output.

Another key difference is the antenna: the Nano Receiver comes with a standard external Dipole T antenna, while the Lite Receiver uses a SMD ceramic antenna, which typically offers shorter range.

For best performance, we highly recommend the Nano Receiver if your build has enough space. However, for racing and 65-85mm whoop drones, the Lite Receiver remains the better choice.

Flat Antenna vs. Tower Antenna

The new Lite Receiver flat antenna V1.2 features an extra-thin3mm board and 0.46g lightweight design, ideal for drones with space constraints. Its low-profile flat antenna can withstand crashes, delivering durability compared to protruding tower antennas.

While both antennas share similar gain and return loss characteristics, the flat antenna V1.2s optimized impedance matching achieves better signal reliability and sensitivity – extending operational range to 1,000m (versus the discontinued tower antennas 600m). This upgrade focuses entirely on perfecting the crash-resistant flat antenna design, delivering pilots unprecedented range and durability in the most compact form factor available.

Configuration & Bind

ExpressLRS uses the Crossfire serial protocol (AKA CRSF protocol) to communicate between the receiver and the flight controller board. So make sure your flight controller board supports the CRSF serial protocol. Next, we use the flight controller with Betaflight firmware to show how to set up the CRSF protocol.

The connection between the ELRS Lite Receiver and the FC board is shown below.

Enable the corresponding UART (e.g. UART3 below) as a Serial Rx on Betaflight Configurator "Ports" tab.

On the "Configuration" tab, select "Serial-based receiver" on the "Receiver" panel, and select "CRSF" as the protocol. Telemetry is optional here and will reduce your stick update rate due to those transmit slots being used for telemetry.

The Lite Receiver comes with offically major release V3.0.0 protocol and no Binding Phrase inlcuded. Lite Receiver could enter binding status by power on/off three times.

• Plugin and unplug the Lite Receiver three times;

• Make sure the LED is doing a quick double blink, which indicates the receiver is in bind mode;

• Make sure the RF TX module or radio transmitter enter binding status, which sends out a binding pulse;

• If the receiver has a solid light, it's bound.

Note: Binding once and the receiver will store the binding information. Re-power and the connect successfully auto.

Note: If you reflash firmware of the receiver with your own Binding Phrase, please make sure the TX module has the same Binding Phrase. The RF TX module and the receiver will bind automatically in this situation.