ExpressLRS is a 2.4 GHz radio link that runs packet rates up to 500 Hz. It holds a control link far past the range of a basic radio, and it costs less than most proprietary long range systems. This guide picks the receiver, walks through binding with a phrase, and sets a failsafe that protects the quad at range.
What is ExpressLRS and why use it for range?
ExpressLRS is an open source radio control link for 2.4 GHz and 900 MHz. It sends control packets up to 500 times per second, which keeps latency low.
The protocol is open, so receivers from many brands work with the same transmitter module. That keeps receiver prices low and options wide.
Which ELRS receiver fits your quad?
The RadioMaster RP1 V2 is a nano receiver on 2.4 GHz with a 65 mm antenna. It runs CRSF at 500 Hz and fits a 5-inch freestyle quad.
The RP3 adds diversity with two antennas for a stronger link at range. The HappyModel EP1 weighs 0.41 g and suits a small whoop or toothpick quad.
How do you bind with a binding phrase?
Set the same binding phrase on the transmitter module and on the receiver. The phrase replaces the old bind-button method and survives firmware updates.
Power the receiver 3 times in quick succession to enter bind mode if no phrase is set. The ExpressLRS binding guide covers both methods step by step.
Where should the receiver antenna go?
Mount the antenna vertically and clear of carbon fiber and battery. Carbon blocks 2.4 GHz signals, so keep the active tip in open air.
Diversity receivers need both antennas mounted at 90 degrees to each other. One vertical and one horizontal antenna covers more orientations.
How do you set a failsafe for long range?
Set the failsafe to cut throttle and level the quad, or to trigger return-to-home on a GPS quad. Test it on the bench with props off before flying.
A 10 mW PWM receiver such as the ER4 suits a small plane with 4 channels. Set its failsafe positions in the transmitter before the first flight.
What limits range in practice?
Antenna placement and local interference limit range more than transmitter power. A 5.8 GHz video link at 1.6 W often fails before the 2.4 GHz control link.
Fly with a clear line of sight and keep the video transmitter at 800 mW or higher for range work. The GEPRC RAD VTX runs at 1.6 W on 40 channels.
Steps
- Flash the same ExpressLRS version on the transmitter module and the receiver.
- Set one binding phrase on both, using only letters, numbers, and dashes.
- Wire the receiver to a UART on the flight controller and set the port to CRSF.
- Set the receiver protocol to CRSF in Betaflight and check the channel monitor.
- Mount the antenna clear of carbon, then range-test on the ground with props off.
- Set the failsafe, test it on the bench, and fly the first range test in open space.
Frequently asked questions
What is the difference between ELRS 2.4 GHz and 900 MHz?
2.4 GHz gives higher packet rates up to 500 Hz, and 900 MHz gives longer range at lower rates. Most freestyle pilots use 2.4 GHz.
Do I need a module for ExpressLRS?
You need a transmitter with ELRS built in, or an external ELRS module in the bay. The receiver must run the same major version as the module.
Why does my ELRS receiver not bind?
Check that the binding phrase matches exactly, and that the firmware versions match. A phrase with a typo will never bind.
Can I use ELRS on a plane?
Yes. A PWM receiver such as the ER4 gives 4 channels at 10 mW for a small plane, and it binds with the same phrase method.
Parts used
RadioMaster RP2 V2 ExpressLRS ELRS Nano Receiver 2.4GHz CRSF 5V 0.55g Built-in Ceramic Antenna for FPV Drone Whoop RC Plane Part, $61.99. RadioMaster RP2 V2 2.4GHz ELRS Nano receiver : 0.55g, built-in ceramic antenna, TCXO, 500Hz refresh, 13x11x7mm for micro drones and whoops. Ships from NY, USA.
RadioMaster RP3 Diversity ExpressLRS ELRS 2.4GHZ Nano Receiver Dual Antenna, $45.66. RadioMaster RP3 Diversity 2.4GHz ELRS Nano receiver : dual 65mm T-antennas, ESP8285 + SX1280, 500Hz refresh, 4.6g, ELRS v3.0 pre-installed. Ships from NY, USA.
RadioMaster RP1 V2 ELRS Nano Receiver 2.4GHz CRSF 500Hz With 65mm UFL T Antenna For TX16S TX12 Boxer Zorro FPV Drone RC RX Kit, $58.99. RadioMaster RP1 V2 2.4GHz ELRS Nano receiver : ESP8285, CRSF, 500Hz refresh, ~0.8ms latency, 65mm UFL T-antenna. Pairs with TX16S, TX12, Boxer, Zorro. Ships from NY, USA.
HappyModel EP1 TCXO 2.4GHz ELRS Receiver, Ultra Light 0.41g, 10x10mm, 25Hz~500Hz Refresh Rate, $31.50. HappyModel EP1 TCXO 2.4GHz ExpressLRS Nano receiver : 0.41g, 10x10mm, TCXO-stabilized, 25Hz: 500Hz refresh, ELRS V3.0.1 pre-installed. T-antenna included. Ships from NY, USA.
2.4G ExpressLRS ELRS Receiver for FPV Freestyle Long Range Drones, $18.57. HPXGRC 2.4GHz ExpressLRS receiver for FPV freestyle and long range drones. Fast, high-speed signal link for DIY RC builds. Ships from NY, USA.
ER4 2.4GHz ExpressLRS PWM Receiver, 4CH, 10mW, $53.99. RadioMaster ER4 2.4GHz ExpressLRS PWM receiver, 4 channels at 10mW. Compact composite build for FPV quads and fixed wing models running ELRS. Ships from NY, USA.
GEPRC RAD 1.6W VTX 5.8GHz 40CH IRC Tramp SmartAudio Long Range, $142.99. GEPRC RAD 1.6W VTX, 5.8GHz 40CH, PIT-1600mW, 2-8S in, IRC Tramp + SmartAudio, MMCX, 9.7g. Antenna, pigtail, hardware, and case included. Ships from NY, USA.
RushFPV Tank Solo 1.6W 5.8GHz VTX 48CH SmartAudio CNC, $97.99. RushFPV Tank Solo 1.6W 5.8GHz VTX in a CNC heat-dissipating shell, 48 channels, Pit to 1.6W, 7-36V in with 5V camera out, SmartAudio V2.1, built-in AGC mic. Ships from NY, USA.
SpeedyBee TX800 VTX 800mW 5.8GHz 48CH Video Transmitter for FPV Racing, $57.72. SpeedyBee TX800 analog VTX, 800mW max on 5.8GHz, 48 channels, IRC Tramp, 20x20mm, 5V input. The budget 800mW stack VTX every 5″ build needs. Ships from NY, USA.
Foxeer Micro Lollipop V4 FPV Antenna 5.8GHz RHCP Single or Pair, $36.99. Genuine Foxeer Micro Lollipop V4 antenna, 5.8GHz RHCP omni, 2.3dBi. Single or matched pair, SMA / RP-SMA / MMCX / UFL, red, purple, or black. Ships from NY, USA.
FS-G7P+ 10CH 2.4GHz RC Transmitter, 300M, with FS-R11P Receiver, $30.99. Flysky FS-G7P+ 10-channel 2.4GHz RC transmitter with FS-R11P and FS-R7P receivers. 300M range for RC crawlers, trucks, cars, boats, and robots. Ships from NY, USA.
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Last updated: 2026-11-10.