Happymodel ES900TX + ES900RX 868/915MHz ExpressLRS RF Set

Short Description:

Happymodel ES900TX and ES900RX ExpressLRS control-link set for 868MHz or 915MHz RC systems, with CRSF receiver output and a fan-cooled external TX module.

Product Name: Happymodel ES900TX + ES900RX 868/915MHz ExpressLRS RF Set
Product Type: ExpressLRS External TX Module and Receiver Set
Frequency Range: 868MHz EU or 915MHz Regional Version
Receiver Interface: CRSF Serial Output to Flight Controller
Output Power: ES900TX <33dBm; ES900RX Telemetry <17dBm
Input Voltage: ES900TX 5–13V DC, 5–9V Recommended; ES900RX 5V DC
Control Protocol: ExpressLRS with CRSF Radio Interface
Receiver Dimensions: 12 × 12 × 3mm
Transmitter Dimensions: 55 × 39 × 11mm
Antenna Connectors: SMA for ES900TX; IPEX1 for ES900RX

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Product Detail

FAQ

Product Overview

The Happymodel ES900TX and ES900RX set is a sub-GHz ExpressLRS radio-control link for FPV aircraft, multirotors and other RC platforms. The set combines an external transmitter module with a compact serial receiver, providing separate 868MHz EU and 915MHz regional configurations. This is an RC command and telemetry link rather than an FPV video transmitter.

Key Features

Matched ExpressLRS TX and RX Set

Includes an ES900TX external transmitter module and an ES900RX receiver for building a matching ExpressLRS control link.

868MHz or 915MHz Configuration

Available as region-specific 868MHz EU or 915MHz configurations. The transmitter, receiver, antennas and firmware regulatory domain must match.

High-Power External TX Module

The ES900TX is rated below 33dBm maximum RF output. The supplied enclosure incorporates heat-dissipation features and active cooling for high-power operation. Forced cooling is recommended when operating above 27dBm.

Compact CRSF Receiver

The 12 × 12 × 3mm ES900RX uses a CRSF serial connection to the flight controller and weighs approximately 0.60g without its antenna.

ExpressLRS Firmware Support

The ES900TX is supported by the Happymodel 900MHz target in the ExpressLRS Configurator. Available update workflows depend on the installed firmware version and include Wi-Fi, UART and EdgeTX passthrough methods.

Technical Specifications

Brand	Happymodel
Models	ES900TX transmitter module + ES900RX receiver
Product Type	ExpressLRS RC control-link transmitter and receiver set
Frequency Options	868MHz EU or 915MHz regional version
RF Chip	SX1276 series
ES900TX MCU	ESP32 + ESP8285
ES900TX Input Voltage	5–13V DC; 5–9V recommended
ES900TX Output Power	Less than 33dBm maximum
ES900TX Dimensions	55 × 39 × 11mm
ES900TX Weight	Approximately 9.2g for the TX module only
ES900TX Antenna Connector	SMA
ES900RX MCU	ESP8285
ES900RX Input Voltage	5V DC
ES900RX Operating Current	Approximately 100mA
Receiver-to-FC Protocol	CRSF
ES900RX Dimensions	12 × 12 × 3mm
ES900RX Weight	Approximately 0.60g, excluding antenna
ES900RX Antenna Connector	IPEX1
Receiver Telemetry Power	Less than 17dBm

Applications

Long-range FPV multirotors and freestyle drones
Fixed-wing RC airplanes and UAV platforms
RC cars and boats requiring a sub-GHz control link
ExpressLRS system upgrades and custom RC projects
Flight controllers supporting a CRSF serial receiver

Installation and Ordering Notes

Select the frequency version permitted in the destination market.
Use the same frequency and regulatory domain on the transmitter and receiver.
Connect the ES900RX to a compatible flight-controller UART using CRSF.
Install the correct antenna before powering the ES900TX or ES900RX.
Confirm external module-bay compatibility and available supply voltage before installation.
Use cooling airflow when operating the ES900TX at elevated RF output levels.

Why Choose HK Corewing

Clear separation of 868MHz and 915MHz procurement configurations
Model-specific specification and package confirmation before bulk ordering
Support for sample evaluation and project-based quantity inquiries
Centralized sourcing for FPV, RC control-link and drone electronics

Package Contents

This product page is intended for the ES900TX and ES900RX combo configuration. The standard combination includes:

1 × Happymodel ES900TX transmitter module assembly
1 × TX antenna matched to the ordered frequency
1 × JR-bay-style enclosure with heat sink and cooling fan
1 × Happymodel ES900RX receiver module
2 × RX antennas matched to the ordered frequency
1 × Adapter wire

Package contents and antenna versions should be reconfirmed before purchase, because the supplied image group also contains TX-only and RX-only configurations.

Frequently Asked Questions

Is the ES900TX a video transmitter?

No. The ES900TX and ES900RX form an ExpressLRS radio-control and telemetry link. They do not transmit FPV camera video.

Can the 868MHz transmitter bind with a 915MHz receiver?

Use matching transmitter and receiver frequency versions with the correct ExpressLRS regulatory domain. An 868MHz configuration should not be mixed with a 915MHz configuration.

What protocol connects the ES900RX to the flight controller?

The ES900RX uses a CRSF serial connection. Connect its TX and RX pads to a compatible flight-controller UART and configure the corresponding serial receiver port.

What power supply does the set require?

The ES900TX accepts 5–13V DC, with 5–9V recommended. The ES900RX requires a regulated 5V DC supply and typically draws approximately 100mA.

What is the maximum ES900TX output power?

The ES900TX specification states less than 33dBm maximum RF output. Effective airflow and active cooling are recommended above 27dBm.

Must the antenna be installed before powering the module?

Yes. Always connect the correct frequency-matched antenna before applying power to the transmitter or receiver.

How can the ES900TX firmware be updated?

The current ExpressLRS documentation supports ES900TX update workflows including Wi-Fi, UART and EdgeTX passthrough. Follow the procedure appropriate for the installed firmware version and select the Happymodel 900MHz ES900TX target.

B2B Procurement FAQ

Which model should be stated on a quotation request?

Specify “Happymodel ES900TX + ES900RX Combo Set” and clearly state whether the required regional version is 868MHz or 915MHz.

Can 868MHz and 915MHz versions be ordered in one shipment?

They may be quoted as separate regional configurations. Quantities, antennas, labels and cartons should remain clearly separated by frequency version.

What information is required for a bulk quotation?

Provide the frequency version, required quantity, destination market, preferred package configuration, delivery location and any documentation requirements.

Can buyers order samples before a production quantity?

Sample availability depends on current stock and the required frequency configuration. State the test quantity and destination when requesting a quotation.

How should package contents be confirmed?

Request a written packing-list confirmation for the ES900TX module, ES900RX receiver, TX antenna, RX antennas, module enclosure, cooling components and adapter wire.

Can custom labels or packaging be requested?

Submit the branding files, packaging requirements, order quantity and target market for project evaluation. Feasibility, cost and minimum quantity should be confirmed in the final quotation.

What compatibility details should distributors publish?

Distributor listings should clearly identify the product as an ExpressLRS RC control link, state the regional frequency, CRSF receiver interface, supply-voltage requirements and external radio-module compatibility conditions.