Introduction
The AMNVOLT Mini SI4732 DSP Radio Receiver V3S is a compact and versatile full-band radio designed for an exceptional listening experience. Featuring the advanced SI4732 DSP chip and an ESP32-S3 main control, this pocket-sized device supports FM, AM, LSB, and USB modes across HF, SW, MW, and VHF bands. Its upgraded ABS injection-molded casing ensures enhanced durability, while optimized circuitry prevents battery drain after shutdown. Enjoy clear audio with its built-in Hi-Z circuit for weak signal resolution and an independent headphone amplifier for loud volume.
Video: Unboxing and overview of the AMNVOLT Mini SI4732 DSP Radio Receiver V3S, highlighting the ESP32-S3-WROOM-1 module, optimized circuitry, and durable ABS shell.
Package Contents
Please check the box for the following items:
- 1 x V3S Mini SI4732 Pocket Radio
- 1 x Telescopic Antenna
- 1 x Loop Antenna
- 1 x Instruction Manual (this document)
- 1 x USB Cable (Type-C)
Key Features
- Upgraded Version: The latest V3S model, released June 2025.
- Enhanced Durability: Features an ABS injection-molded casing, replacing previous 3D printed versions for increased sturdiness.
- Optimized Power Management: Circuitry has been optimized to eliminate battery drain issues after shutdown.
- Advanced Chipset: Utilizes the genuine ESP32-S3-WROOM-1 module and SI4732 DSP chip for superior performance.
- Wide Frequency Coverage: Supports LW, MW, SW (150kHz - 30MHz), and VHF (64-108Mhz) bands.
- Multiple Modes: Capable of receiving FM, AM, LSB, and USB signals (Note: Does not support aviation band).
- High-Resolution Display: Equipped with a 1.9-inch IPS high-definition color screen (170*320 resolution).
- Adjustable Screen: Supports screen backlight brightness adjustment (32-255 levels) and battery level display.
- Audio Enhancements: Built-in Hi-Z circuit to enhance weak signal resolution and an independent headphone amplifier circuit for loud headphone volume.
- Long Battery Life: Integrated 800mAh battery provides over 10 hours of continuous playback.
- User-Friendly Interface: Includes a detailed menu and setting functions for bandwidth adjustment, quick volume adjustment, and AGC ATT setting.
- Firmware Upgradable: Open Source System with support for firmware updates.
Figure 1: Product overview highlighting key interfaces and the durable ABS shell.
Figure 2: Displaying the radio's detailed menu and setting functions.
Specifications
| Feature | Description |
|---|---|
| Hardware Version | V3S by AMNVOLT |
| Model | ATS MINI PRO |
| Master Control | ESP-32-S3 |
| DSP Chip | SI4732 |
| Working Modes | FM/AM/LSB/USB (Note: Does not support aviation band) |
| Receiving Bands | HF/SW/MW/VHF |
| Frequency Range | LW, MW, SW (150kHz - 30MHz), VHF (64-108Mhz) |
| Screen | 1.9-inch IPS high-definition color screen, 170*320 resolution |
| Screen Brightness | 32~255 levels, adjustable |
| Charging Port | TYPE-C (cannot use fast charging) |
| Audio Interface | 3.5mm three-band stereo |
| Antenna Interface | SMA-KE (inner hole) |
| Battery Capacity | 800mAh (Rechargeable Battery Pack) |
| Battery Included | Yes |
| Casing Material | ABS |
| Product Dimensions | 73.00mm (L) x 32.00mm (W) x 12.00mm (H) / 2.87in x 1.26in x 0.47in |
| Product Weight | 0.163 kg |
| Functions | Built-In Speaker, Built-in Amplifier, Hi-Z Circuit, Headphone Amplifier |
Figure 3: Radio dimensions.
Figure 4: Specialized brackets for the radio.
Setup
- Charge the Device: Before first use, fully charge the radio using the provided Type-C USB cable. Connect the cable to the Type-C port on the radio and a standard USB power source. Note that fast charging is not supported.
- Attach Antenna: Depending on your reception needs, attach either the telescopic antenna or the loop antenna to the SMA antenna interface (inner hole) on the radio. Ensure a secure connection.
- Power On: Press and hold the power button (usually integrated with the encoder knob) to turn on the radio.
Operating Instructions
- Power On/Off: Press and hold the encoder knob to power the device on or off.
- Tuning: Rotate the encoder knob to tune through frequencies. The display will show the current frequency.
- Band Selection: Navigate through the menu using the encoder knob (press to select, rotate to scroll) to choose your desired band (FM, AM, LSB, USB).
- Volume Control: Adjust the volume using the dedicated volume control function, accessible via the menu or a quick press of the encoder.
- Headphone Use: For private listening, plug your 3.5mm stereo headphones into the audio interface. The built-in headphone amplifier ensures a loud and clear audio experience.
- Screen Brightness: Access the menu to adjust the screen backlight brightness (32-255 levels) for optimal viewing in various lighting conditions.
- Bandwidth Adjustment: Utilize the menu settings to adjust the bandwidth for improved reception quality, especially in crowded frequency environments.
- AGC ATT Setting: Configure the Automatic Gain Control (AGC) and Attenuator (ATT) settings through the menu to optimize signal reception and prevent overload.
Figure 5: Internal components and supported frequency bands.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the radio's exterior. Avoid using harsh chemicals or abrasive materials.
- Battery Care: To prolong battery life, avoid completely discharging the battery frequently. Charge the device regularly, even if not in use for extended periods.
- Storage: Store the radio in a cool, dry place away from direct sunlight and extreme temperatures.
Troubleshooting
- No Power: Ensure the battery is charged. Connect the radio to a power source using the Type-C USB cable.
- No Sound: Check the volume level. If using headphones, ensure they are properly plugged in.
- Poor Reception: Extend the telescopic antenna fully or adjust the position of the loop antenna. Experiment with different antenna types for specific bands. The built-in Hi-Z circuit is designed to improve weak signal resolution.
- Battery Drain: This V3S model features optimized circuitry to prevent battery drain after shutdown. If you experience unexpected battery loss, ensure the device is fully powered off and contact support if the issue persists.
Firmware Updates
The AMNVOLT Mini SI4732 DSP Radio Receiver V3S operates on an open-source system and supports firmware updates. This allows for potential improvements in functionality and performance over time.
Figure 6: Firmware update capability.
For detailed instructions on how to perform firmware updates, please refer to the official AMNVOLT website or the comprehensive user manual provided with your device. Always follow the manufacturer's guidelines to avoid damaging the device.
User Tips
- Wi-Fi Capability: With the latest firmware, this model can support Wi-Fi functionality. Check for available firmware updates to enable this feature.
- Headphone Volume: The independent headphone amplifier circuit ensures a robust audio output. If you find the volume too high, adjust it using the radio's controls.
Warranty and Support
For warranty information, technical support, or any inquiries regarding your AMNVOLT Mini SI4732 DSP Radio Receiver V3S, please contact the seller or refer to the official AMNVOLT support channels. Keep your purchase receipt for warranty claims.
