The **ESP32-S3 SI4732 Pocket Multiband Receiver** is a compact, feature-rich radio receiver project that utilizes the **Lilygo T-Display S3** development board. This device is powered by an ESP32-S3 microcontroller and integrates a **1.9-inch ST7789 IPS display**, making it a versatile platform for radio enthusiasts. The project is based on an open-source sketch developed by Ralph Xavier, which transforms the hardware into a fully functional multiband radio capable of receiving **LW (longwave), MW (medium wave), SW (shortwave)** in both **AM and SSB (single sideband)** modes, as well as commercial FM stations.

Project detail

https://xtronic.org/circuit/rf/radio-receiver/esp32-s3-si4732-pocket-multiband-receiver/

Em português

https://te1.com.br/2025/01/si4732-esp32-s3-receptor-multibanda-tela-ips/

## **Key Features**

1. **Hardware Platform:**

  - The receiver uses the **Lilygo T-Display S3**, which includes:

    - An ESP32-S3 microcontroller with dual-core LX7 processors running at up to 240 MHz.

    - 16 MB of Flash memory and 8 MB of PSRAM for smooth operation.

    - Integrated Wi-Fi and Bluetooth 5.0 for connectivity.

    - A **1.9-inch IPS ST7789 display** with 170x320 resolution for clear visuals.

  - The device can also be adapted to work with the **T-Embed** board by modifying pin configurations.

2. **Radio Module:**

  - The project employs the **SI4732 DSP chip**, a highly capable digital signal processor designed for AM/FM/SW/LW/SSB reception.

  - The SI4732 enables precise tuning, excellent sensitivity, and support for advanced features like bandwidth adjustment and sideband selection (USB/LSB).

3. **Functionality:**

  - Supports tuning across multiple bands:

    - LW: Longwave

    - MW: Medium wave

    - SW: Shortwave

  - Modes include:

    - AM (Amplitude Modulation)

    - SSB (Single Sideband), with options for USB (Upper Sideband) and LSB (Lower Sideband).

  - FM reception for commercial radio stations.

  - Fine-tuning capabilities for precise frequency adjustments.

4. **Display and Interface:**

  - The **1.9-inch IPS display** provides a vibrant user interface for frequency, mode, and signal strength visualization.

  - The interface is designed to be intuitive, leveraging the graphical capabilities of the ST7789 driver.

5. **Open-Source Software:**

  - Ralph Xavier's sketch is open-source and available on platforms like GitHub, allowing users to customize or enhance the functionality of their receiver.

  - The sketch supports additional configurations, such as changing pins to adapt to different hardware like the T-Embed.

6. **Power Options:**

  - The Lilygo T-Display S3 supports LiPo battery integration, making it portable and ideal for outdoor use.

  - It can also be powered via USB-C for stationary setups.

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Buy SI4732 pocket multiband radio receiver

## **Applications**

This receiver is ideal for:

- Amateur radio enthusiasts exploring shortwave and single sideband communications.

- Hobbyists interested in building custom radio projects.

- Educational purposes to learn about radio frequency technologies and digital signal processing.

## **Conclusion**

The ESP32-S3 SI4732 Pocket Multiband Receiver is an excellent choice for DIY enthusiasts and amateur radio operators looking for a customizable, portable solution with advanced features. Its combination of modern hardware (ESP32-S3) and robust software makes it a standout option in the realm of multiband receivers.