SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver
The SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver brings a fast, dependable ExpressLRS link to builds where every gram counts. Low latency keeps your drone locked to your sticks through tight racing lines, and stable timing means the link behaves the same on a hot summer afternoon as on a frosty morning. Plug it in or solder it on, bind it in seconds and spend less time at the bench and more time in the air.
SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver — Low Latency in Just 0.7g
The SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver is a tiny ExpressLRS receiver for FPV drones and FPV planes. It weighs just 0.7g and measures 18x10.8x5mm, so it fits even into tight frames. It works in the 2.4GHz ISM band and supports the F1000Hz and F500Hz refresh rates for low control latency. On board are an ESP8285 processor, an SX1281 RF chip, a temperature-compensated crystal oscillator (TCXO) and a PA+LNA amplifier with 100mW (20dBm) telemetry output. The receiver talks to the flight controller over CRSF, runs on 5V and connects either with the SH1.0-4P plug or through the 2.54mm 4-pin pads. It ships with ExpressLRS 3.4.0 firmware, so your radio needs ExpressLRS from the same major version (3.x). The kit includes an 80mm 2.4G antenna with an IPEX1 connector, a 100mm SH1.0-4P cable and two heat shrink tubes.
A Reliable 2.4GHz Link
The receiver works in the 2.4GHz band. SEQURE designed it for strong signal penetration and high resistance to interference, so the link stays dependable in flight.
Refresh Rates up to 1000Hz
Support for the F1000Hz and F500Hz refresh rates means very frequent control updates. The low latency matters most to racing pilots, where every millisecond counts.
SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver Key Features
Stable in Heat and Cold
A temperature-compensated crystal oscillator (TCXO) keeps the timing stable as the ambient temperature changes. The link works just as reliably on a hot summer day as in winter frost.
Practically Weightless
The receiver weighs 0.7g and measures 18x10.8x5mm. It fits into a tight frame and adds practically no weight to the drone.
Two Ways to Connect
Plug it in with the included SH1.0-4P cable or solder wires to the 2.54mm 4-pin pads. You pick the option that suits your flight controller and frame.
Setup Without Cables
The ESP8285 processor has its own WiFi antenna and the receiver has a WiFi mode. In ExpressLRS this mode lets you update the firmware and change settings from a web browser.
Stable Telemetry
A high-power PA+LNA amplifier boosts both the outgoing and the incoming signal. The receiver sends telemetry back to your radio at 100mW (20dBm), so the flight data returned to the radio is more stable.
SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver Suitable Applications
SEQURE designed the receiver for small, fast FPV builds, both multirotor and fixed-wing.
- FPV racing drones
- Small FPV drones
- FPV fixed-wing planes
SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver Layout
One side of the board carries the ESP8285 processor with its WiFi antenna, the LED and the SH1.0-4P socket. The other side holds the SX1281 RF chip, the TCXO, the PA+LNA amplifier, the IPEX1 antenna connector, the Boot button and the RX, TX, 5V and GND pads. The included T antenna is 80mm long.
Connecting and Setting Up the SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver
Connect the receiver to a free UART on the flight controller. Wire GND to GND and 5V to 5V, then the receiver TX to the UART RX (R1) and the receiver RX to the UART TX (T1).
Betaflight Setup
- Make sure the flight controller firmware includes the CRSF protocol. In the Betaflight firmware flasher, select CRSF under Radio Protocol.
- On the Ports tab, enable Serial RX on the UART the receiver is connected to, then save and reboot.
- On the Receiver tab, set the receiver mode to Serial (via UART) and the provider to CRSF, then save.
- With the radio connected, the channel bars on the Receiver tab show in colour and follow the sticks. If they stay grey, flash the flight controller with firmware that supports CRSF.
Binding
To enter binding mode, switch the receiver power on and off three times, as is standard in ExpressLRS. A continuous green double flash means the receiver is in binding mode. If the LED shows a different pattern, repeat this step, then start binding on your radio.
LED Indicator
Green single flash | Waiting for the radio connection |
Green double flash | Binding mode |
Green steady | Connected |
Green fast flash | WiFi mode |
SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver Specification
Model | SEQURE ELRS 2.4GHz Single RX |
Factory Firmware | SEQURE 2.4GHz Single RX_3.4.0 |
Processor (MCU) | ESP8285 |
RF Chip | SX1281 |
Crystal Oscillator | Temperature-compensated (TCXO) |
Telemetry Power (PA) | 100mW (20dBm) |
LNA | Yes |
Refresh Rate | F1000Hz, F500Hz |
Indicator | LED |
Frequency Band | 2.4GHz ISM |
Protocol | CRSF |
RF Mode | Single antenna |
Antenna Connector | IPEX1 |
Receiver Interface | SH1.0-4P socket, 2.54mm 4-pin pads |
Operating Voltage | 5V |
Weight | 0.7g |
Dimensions | 18x10.8x5mm |
SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver Package Includes
- 1x SEQURE ELRS 2.4GHz Single RX Single Antenna Receiver
- 1x 2.4G Antenna, 80mm
- 1x 30AWG Single-End SH1.0-4P Cable, 100mm
- 2x Heat Shrink Tube, 12x30mm