AMNVOLT ATS Mini SI4732 V4 All Band Receiver

1. Introduction

The AMNVOLT ATS Mini SI4732 V4 is a compact and versatile all-band radio receiver designed for enthusiasts and amateur radio operators. It supports a wide range of broadcasting modes including AM, FM, SSB (LSB/USB), and features an integrated Hi-Z headphone amplifier for enhanced audio quality. This manual provides essential information for setting up, operating, and maintaining your ATS Mini V4 receiver.

Image: AMNVOLT ATS Mini V4 radio with both telescopic and loop antennas.

2. Package Contents

Please check the package for the following items:

• 1 x AMNVOLT V4 Radio
• 1 x Telescopic Whip Antenna
• 1 x Rotatable Loop Antenna

Note: Headphones are not included in the package and must be provided by the user for certain functions.

3. Key Features

• Advanced Control: Equipped with ESP32-S3 main control and SI4732 DSP for comprehensive signal processing.
• Wide Band Support: Supports ALL Band broadcasting, including LSB, USB, AM, and FM modes, with AGC/ATT function.
• High-Definition Display: Features a 1.9-inch IPS high-definition color screen with adjustable backlight brightness and battery level display.
• Superior Audio: Built-in 1W power cavity speaker for loud and clear sound quality, and a dedicated headphone amplifier circuit for powerful audio output.
• Enhanced Signal Reception: Integrated Hi-Z circuit moved to the front end of the antenna path, powered by stable VCC_RADIO, to preserve signal resonance and reduce noise.
• Durability & Reliability: Upgraded hardware circuitry with ESD-protected antenna input and genuine ESP32 modules (ESP32-S3-WROOM-1-N16R8) for long-term durability and reliability.
• Firmware Upgradable: Supports firmware updates; pre-installed firmware version is at least VER.2.3.1. Regular updates are recommended for optimal performance.
• Versatile Antenna Options: Includes a telescopic whip antenna and a rotatable loop antenna for varied reception needs.

Image: Upgraded Hardware Circuitry with ESP32 Module and Shielded Si4732 Tuner.

4. Setup Guide

4.1 Initial Charging

• Connect the ATS Mini V4 to a standard USB power source using a TYPE-C cable.
• Important: Do not use fast chargers, as they may damage the device.

4.2 Attaching the Antenna

The ATS Mini V4 comes with two types of antennas:

• Telescopic Whip Antenna: Screw this antenna into the SMA-KE (inner hole) interface on the device for general reception.
• Rotatable Loop Antenna: Connect this antenna to the SMA-KE interface. This antenna supports 360-degree rotation for optimizing reception.

Image: Two ways to use the ATS Mini V4 with telescopic and rotatable loop antennas.

4.3 Headphone Connection

• Plug 3.5mm 3-pin stereo headphones into the audio interface.
• Wired headphones can also function as an FM antenna. For best performance in strong FM signal environments, use headphones with longer cables.

Image: Integrated Headphone-Antenna Circuit for FM reception on the go.

5. Operating Instructions

5.1 Power On/Off

Press and hold the power button (usually integrated with the main knob) to turn the device on or off.

5.2 Tuning and Mode Selection

• Use the main rotary encoder to tune through frequencies.
• Navigate through menus to select desired operating modes: FM, AM, LSB, or USB.
• The device supports AGC (Automatic Gain Control) and ATT (Attenuation) functions to optimize signal reception.

5.3 Display and Settings

The 1.9-inch IPS screen displays frequency, battery level, and other operational parameters. You can adjust various settings through the device's menu:

Image: ATS Mini V4 settings table for Basic Setup, Sound Tune, and Advanced Set.

5.4 Firmware Updates

The ATS Mini V4 supports firmware upgrades. Connect the device to a computer via the TYPE-C port. Refer to the official AMNVOLT website or community forums for the latest firmware and instructions on how to update. Regular updates are recommended for optimal performance and new features.

6. Care and Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Avoid using harsh chemicals or abrasive materials.
• Storage: Store the receiver in a cool, dry place away from direct sunlight and extreme temperatures.
• Charging: Always use a standard USB charger and TYPE-C cable. Avoid fast chargers to prevent battery damage.
• Antenna Care: Handle the telescopic antenna gently to prevent bending or breaking. Ensure the loop antenna is securely attached.
• Firmware: Keep the firmware updated to ensure the best performance and access to the latest features.

7. Troubleshooting

7.1 Weak Signal Reception

• Antenna Position: Adjust the position and orientation of the telescopic antenna. For the loop antenna, utilize its 360-degree rotation capability to find the optimal signal.
• External Interference: Move away from electronic devices that may cause interference.
• FM Reception with Headphones: If using headphones as an FM antenna, try a longer headphone cable for improved reception in weak signal areas.

7.2 Weak WiFi Signal (Metal Casing Version)

If you have the CNC metal casing version, the metal material can have a shielding effect on wireless electromagnetic signals. While this improves interference suppression for radio reception, it may weaken the device's WiFi signal strength. This is a characteristic of the metal casing and not a defect.

7.3 Device Not Powering On

• Ensure the battery is sufficiently charged. Connect to a power source and allow it to charge for a while before attempting to power on again.
• Verify the charging cable and adapter are functioning correctly.

7.4 Software Version

The device comes with firmware version VER.2.3.1 or later installed. For the latest features and bug fixes, it is recommended to regularly check for and install firmware updates.

8. Specifications

8.1 V4 Upgrade Details Comparison

The V4 model introduces several significant upgrades over previous versions:

Image: Detailed comparison of ATS Mini V1-V4 models.

9. User Tips

• Metal Casing Consideration: If you choose the CNC metal casing version, be aware that while it improves interference suppression for radio signals, it may slightly weaken the device's WiFi signal strength due to its inherent shielding properties.
• Headphone as FM Antenna: For optimal FM reception, especially in areas with weaker signals, use wired headphones with longer cables. Remember, headphones are not included.
• Firmware Updates: Regularly check for and install the latest firmware updates to ensure your device operates with the best performance and has access to new features.
• Loop Antenna Usage: When using the rotatable loop antenna, experiment with its 360-degree rotation to achieve the best possible signal reception.
• Portability: The compact size of the ATS Mini V4 makes it an excellent companion for outdoor activities like hiking and camping.

Image: The ATS Mini V4 is easy to carry, making it a good outdoor companion.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the documentation provided at the time of purchase or visit the official AMNVOLT website. Keep your proof of purchase for any warranty claims.