• GT-38 433MHz Long Range UART Transceiver Module with Copper Spring Antenna and 4-pin Header for Arduino projects.
  • Top view of the compact GT-38 RF Module PCB showing dimensions (26.7mm x 12.9mm) and embedded SI4438 chipset.
  • GT-38 Wireless Serial Module pinout diagram showing VCC, GND, TXD, RXD, and SET configuration pins for easy hookup.
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GT-38 UART 433MHz Wireless Transceiver Module | 1200m Range SI4438

GT-38 UART 433MHz Wireless Transceiver Module | 1200m Range SI4438

HK$49.00
HK$49.00
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Delivery Options

  • Local delivery within Hong Kong and in-store pickup.​
  • Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.​
  • Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).​
  • Estimated delivery time: 1–3 business days after dispatch (Hong Kong).​
  • In-store pickup details (location and time) will be confirmed by email or phone message.​
  • Delivery times are estimates and may be affected by weather or unforeseen circumstances.​

Introducing the next generation of sub-GHz wireless communication: the GT-38 Long Range 433MHz Transceiver. Engineered around the high-performance Silicon Labs SI4438 chip, this embedded module delivers unparalleled reliability and a proven 1200-meter communication distance.1 Designed for simplicity, the built-in MCU enables transparent serial data transfer, making wireless integration into popular platforms like Arduino and other microcontroller projects seamless and fast.3

Key Features and Benefits

  • 1200M Long-Range Reliability: Utilize the robust 20dBm (100mW) power output and superior link budget derived from the SI4438 for extended coverage in open fields (achieved in FU4 mode).
  • Plug-and-Play UART Interface: Achieve instant wireless setup using standard 3.3V/5V TTL serial ports. The transparent transmission mode eliminates the need for complex RF protocol programming, presenting the module as a simple wireless bridge.
  • Battery Life Optimization (80μA Mode): Select the FU2 mode to minimize idle current to just $80\mu A$. This feature dramatically extends the deployment life of battery-powered sensors and remote IoT devices, positioning the GT-38 as an energy-efficient choice.
  • Flexible Network Topologies: The operational band of 433-458.5MHz offers up to 255 channels, ensuring channel separation and reliable communication. The module supports secure one-to-one, one-to-many, and many-to-many data links, facilitating complex network deployments.
  • Enhanced Data Handling: The maximum number of bytes that can be sent in a single operation is up to 256 bytes, ensuring efficient bulk data transmission.

Detailed Technical Specifications

Parameter Value Detail/Insight
Core Chipset SI4438 (EZRadioPRO)

High-performance, high-sensitivity RF platform.1
Frequency Range 433.0 ~ 458.5 MHz 255 selectable channels (100 KHz step).
Interface UART (TX/RX) Supports 3.3V / 5V TTL logic levels.
Reference Range 1200 meters (Open Field) Achieved in FU4 mode at 1000bps air baud rate.
Max TX Power 20 dBm (100 mW) 8 configurable output power levels.
RX Sensitivity -116 dBm (at 5000bps) Contributes to industry-leading link budget.
Operating Voltage 3.2V ~ 5.5V DC Wide compatibility with embedded systems.
Lowest Idle Current 80 μA (FU2 Mode) Optimal for battery-powered long-life deployment.
Dimensions 26.7 mm x 12.9 mm Compact module footprint for integration [Image 2].
Operating Temperature -25°C to +75°C Suitable for rugged industrial applications.

 

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