ExpressLRS 2.4 GHz and 900 MHz use different-band hardware, so the transmitter and receiver must match. ExpressLRS describes 2.4 GHz as the common all-around option with smaller antennas and higher packet-rate options; 900 MHz can suit some long-range or high-interference plans but has larger antennas and regional frequency rules. Read the radio protocol guide before buying a module.
Choose the radio band that matches your aircraft, flight environment and local rules. A transmitter module and receiver in different bands will not form a compatible link.
Side by side
| 2.4 GHz | 900 MHz | |
|---|---|---|
| Typical fit | General-purpose builds and compact antennas | Long-range or high-interference use cases where regional rules allow |
| Antenna | Smaller antennas | Larger antennas for comparable antenna designs |
| Packet-rate options | Higher rates are available in ExpressLRS | Lower maximum packet-rate options than 2.4 GHz |
| Compatibility | Pair with matching 2.4 GHz ExpressLRS hardware | Pair with matching 900 MHz hardware |
| Local rules | Check transmitter power and permitted channels | Check which regional sub-band and power are permitted |
Make the system match
Before buying a module, confirm the transmitter’s module bay and supported protocol. Match the receiver band, firmware target and regulatory domain to the transmitter. Mount the antennas as the manufacturer instructs and keep them clear of carbon, batteries and other shielding structures.
ExpressLRS’s hardware selection guide discusses the band tradeoffs and current hardware families. For setup and protocol context, see RC radio protocols explained.
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Common questions
Will a 2.4 GHz ExpressLRS transmitter bind to a 900 MHz receiver?
No. The transmitter and receiver must use compatible hardware in the same band. Verify the exact radio and receiver specifications before ordering.
Is 900 MHz always longer range?
The band alone does not guarantee a flight distance. Antennas, power, packet rate, obstructions, installation and local radio rules all matter.
Which ExpressLRS band should a beginner choose?
ExpressLRS recommends 2.4 GHz for most new users. Consider 900 MHz when your flight plan and equipment benefit from it, then verify local frequency and power requirements.