Ra-02 is based on SX1278 wireless transparent transmission module (transceiver one), with IPEX socket it can connect external antenna. Using advanced LoRa spread spectrum technology, communication distance is10000 meters, super error correction, anti-interference ability, with the air wake-up function (ultra-low power consumption). It can be used in the enviroment with thousands of people,especially for meter reading, smart home, burglar alarm and other equipment. Feature: LoRa Spread Spectrum Modulation Technology +20dBm-100mW Constant RF power output when voltage changes High sensitivity: low to -148dBm Half-duplex SPI communication Programmable bit rates up to 300kbps Supports FSK, GFSK, MSK, GMSK, LoRa and OOK modulation modes 127dB RSSI dynamic range Automatic RF signal detection, CAD mode and ultra-high-speed AFC With CRC, up to 256 bytes of packet engine Small volume dual-row stamp-hole patch package With shielding shell Spring antenna (Ra-01) or IPEX external antenna (Ra-02) Wireless standard 433MHz Frequency range: 420 ~ 450MHz Interface: SPI GPIO Voltage:1.8 ~ 3.7V, the typical value is 3.3V Current: Receiver:? 10.8mA (LnaBoost off, band 1) Transimit: ? 120mA (+ 20dBm) Sleep mode: 0.2?A Working temperature: -40 to + 85 ? C Storage temperature: normal

Please Note: Images are for representation only. The actual Product may diffe

1. Product Description

The SX1278 LoRa RA-02 Long-Range Wireless Transceiver Module with Breakout Board is a compact wireless communication solution designed for long-range, low-power IoT and embedded applications. Based on the SX1278 transceiver, it uses LoRa spread-spectrum modulation technology to provide long-distance communication, high receiver sensitivity, and strong resistance to interference.

Operating in the 433MHz frequency band, the module supports wireless data transmission and reception through an SPI interface. It offers a specified RF output power of up to +20dBm (100mW) and receiver sensitivity as low as -148dBm, making it suitable for applications requiring reliable communication over extended distances. The stated communication range can reach up to 10km under suitable conditions, depending on antenna selection, terrain, obstacles, interference, and radio configuration.

The module supports multiple modulation modes, including LoRa, FSK, GFSK, MSK, GMSK, and OOK. It also incorporates error detection, automatic signal detection, channel activity detection (CAD), and automatic frequency control features to improve communication reliability.

Featuring an IPEX antenna connector, a compact shielded design, and an included breakout board, the module can be integrated into compatible microcontroller platforms such as Arduino and ESP32. It is suitable for remote sensor networks, smart agriculture, wireless monitoring, smart home systems, meter reading, and other long-range IoT applications.

2. Features

• Based on the SX1278 LoRa transceiver

• Operates in the 433MHz frequency band

• Uses LoRa spread-spectrum modulation technology

• Specified communication range of up to 10km under suitable conditions

• RF output power up to +20dBm (100mW)

• High receiver sensitivity of up to -148dBm

• Half-duplex SPI communication interface

• Programmable data rates up to 300kbps, depending on modulation mode

• Supports LoRa, FSK, GFSK, MSK, GMSK, and OOK modulation modes

• High resistance to interference through appropriate LoRa configuration

• Automatic RF signal detection

• Channel Activity Detection (CAD) support

• Automatic Frequency Control (AFC)

• CRC error detection support

• Packet engine supporting packets up to 256 bytes

• Low-power sleep mode

• IPEX connector for an external antenna

• Compact shielded module design

• Compatible with suitable microcontrollers and breakout-board interfaces

3. Specifications

Note: The maximum data rate depends on the selected modulation and radio configuration. The actual communication range and current consumption vary with antenna, transmit power, spreading factor, bandwidth, supply quality, and operating conditions.

4. Working Principle

The SX1278 transceiver converts digital data from a connected microcontroller into radio-frequency signals for wireless transmission. The receiving module detects the transmitted signals and converts them back into digital data.

The module communicates with the host microcontroller through the SPI interface, which is used to configure radio parameters and transfer data. The microcontroller can set parameters such as frequency, transmit power, spreading factor, bandwidth, and coding rate, depending on the selected communication mode and library.

LoRa modulation spreads the transmitted signal across a wider bandwidth, improving sensitivity and communication robustness under suitable conditions. This makes it useful for low-data-rate applications that need longer range than many conventional short-range wireless technologies.

The module operates in half-duplex mode, meaning it transmits or receives at a given time rather than transmitting and receiving simultaneously.

5. LoRa Wireless Technology

LoRa is a spread-spectrum radio modulation technology designed for long-range communication. It can provide strong receiver sensitivity and useful interference tolerance, depending on the configured radio parameters.

The SX1278 supports LoRa as well as several other modulation modes. Its programmable configuration allows developers to balance range, data rate, airtime, and power consumption for the intended application.

The module is particularly suitable for transmitting small data packets from remote sensors and embedded devices.

6. Interface and Connectivity

The module uses an SPI interface to communicate with a host microcontroller. Depending on the breakout-board design, the connection may expose the following signals:

• VCC: Power supply

• GND: Ground

• SCK: SPI clock

• MISO: SPI data from module to controller

• MOSI: SPI data from controller to module

• NSS/CS: SPI chip select

• RESET: Module reset

• DIO pins: Configurable digital signals and interrupt functions

The exact pin labels and number of exposed DIO pins depend on the breakout board. Verify the board pinout before wiring.

7. Power Supply Requirements

The module operates from 1.8V to 3.7V, with 3.3V as the typical supply voltage. Its power supply must provide sufficient current during transmission, particularly when operating at the maximum specified RF output power.

At +20dBm, the supplied specification lists approximately 120mA transmit current. A stable 3.3V supply with adequate current capacity is recommended.

Important: Do not power the module directly from a 5V supply. Ensure that SPI and GPIO signal levels are also compatible with the module’s electrical requirements.

8. Antenna Connection

The RA-02 module uses an IPEX antenna connector for an external antenna.

For effective communication, use an antenna suitable for the 433MHz frequency band and ensure that the connector and antenna are compatible. Antenna placement, orientation, nearby objects, and the surrounding environment can significantly affect communication performance.

The antenna and breakout-board accessories included in the package should be verified with the seller.

9. Applications

The SX1278 LoRa RA-02 module is suitable for:

• Smart agriculture and farm monitoring

• Remote environmental sensors

• Long-range IoT communication

• Smart home automation

• Wireless meter reading

• Remote data acquisition

• Industrial monitoring

• Wireless alarm systems

• Security and monitoring devices

• Weather station networks

• Water level monitoring

• Remote equipment monitoring

• Arduino and ESP32 wireless projects

• Low-power sensor networks

10. Package Includes

The supplied product title indicates a module with a breakout board, but the exact package contents are not fully specified.

Please confirm whether the package includes:

• SX1278 RA-02 transceiver module

• Breakout board

• 433MHz antenna

• Connecting accessories

Only the items explicitly listed by the seller should be considered included.

11. Product Disclaimer

• The stated 10km communication range is a maximum claim under suitable conditions and is not guaranteed in every installation.

• Actual range depends on antenna quality, antenna height, terrain, obstacles, interference, transmit power, and radio settings.

• The module requires compatible software and an SPI-capable microcontroller.

• The module uses a 3.3V typical supply and is not intended for direct 5V power input.

• Ensure that the antenna is suitable for the operating frequency.

• Verify local radio regulations and permitted transmit-power limits before use.

• Product images are for illustration and representation purposes only. The actual product may differ slightly in appearance.

r slightly in appearance.