AMNVOLT V4 ATS MINI SI4732 Radio User Manual

Introduction

The AMNVOLT V4 ATS MINI SI4732 Radio is a compact, all-band DSP receiver designed for enthusiasts and casual listeners alike. Featuring FM, AM, LSB, USB modes, and an upgraded hardware circuitry, this device offers a comprehensive listening experience. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your radio.

AMNVOLT V4 ATS MINI SI4732 Radio with antennas — Figure 1: AMNVOLT V4 ATS MINI SI4732 Radio with included antennas.

Setup Guide

Initial Charging

Connect the device to a power source using a USB Type-C cable.
Ensure the power adapter provides 5V and 0.5A current for optimal charging. Fast chargers are not recommended.
The radio supports overcharge and overdischarge protection.

Antenna Connection

Before use, always connect an antenna to the SMA-KE (inner hole) interface. Handle the antenna interface with care to prevent damage.

Two ways to use the radio with different antennas — Figure 2: The radio can be used with either the telescopic whip antenna or the rotatable loop antenna for varied reception.

Basic Operation Steps

After charging, turn on the radio using the switch button.
Rotate the encoder to adjust the desired frequency.
To enter the menu page, click the encoder button.
Rotate the encoder again to adjust the volume.

Headphone Feature

The V4 version includes an integrated headphone-antenna circuit. You can plug in a 3.5mm headphone to use it as an FM antenna, especially effective in areas with strong FM signals and with longer headphone cables.

Integrated Headphone-Antenna Circuit diagram — Figure 3: Diagram illustrating the use of wired headphones as an FM antenna. Headphones are not included.

Hardware Overview

Robust casing, available in Metal or ABS plastic, showing features — Figure 4: Overview of the radio's robust casing (Metal or ABS plastic) and interfaces including Type-C port, 3.5mm headphone jack, upgraded anti-slip encoder, and SMA antenna interface.

Detail of the strap hole on the metal case version — Figure 5: Close-up of the strap hole, available only on the metal case version for attaching a hanging strap.

Operating Instructions

Function Configuration Menu

The radio's menu allows for detailed configuration of various parameters. Note that with firmware updates, the system's interface and operation may change slightly.

Menu	Parameter	Function	Comments
1	Band	Select band data from the internal band table	VHF (example)
2	Mode	Select Mode (FM, AM, LSB, USB)	FM (example)
3	Volume	Adjust volume level	Default 35
4	Step	Adjust frequency step	100 kHz (example), Mode and Band specific
5	Bandwidth	Adjust filter bandwidth	Auto (example), Mode specific
6	Mute	Mute/Unmute the volume	Off (example)
7	AGC/ATTN	Adjust AGC and Attenuation	FM: AGC ON, AM: AGC ON, SSB: AGC ON. Mode specific
8	SoftMute	Adjust Softmute (Max Attn)	AM: 4 dB, SSB: 4 dB. Mode specific
9	AVC	Adjust AVC (Max Gain)	AM: 48 dB, SSB: 48 dB. Mode specific
10	Spare 1	Spare	N/A
11	Seek Up	FM, AM seek up	Up/Dn
12	Seek Dn	FM, AM seek down	Up/Dn
13	Calibration	Adjust calibration offset	0 Hz (example), Separate value per band
14	Brightness	Adjust display brightness level	Default 128 (range 32-255)
15	Spare 2	Spare	N/A

Advanced Features

Hi-Z Circuit: The upgraded Hi-Z circuit is positioned at the front end of the antenna path, powered by a stable VCC_RADIO supply. This design helps preserve signal resonance and significantly reduces noise, enhancing weak signal resolution.
Multiple System Themes: Customize your device's display with various system themes to suit your preference.

Diagram showing the advanced Hi-Z design — Figure 6: Illustration of the advanced Hi-Z circuit design for improved signal reception.

Multiple system themes displayed on the radio screen — Figure 7: Examples of multiple system themes available for display customization.

Maintenance

Battery Care

Always use a good quality power adapter with 5V and 0.5A output for charging.
Monitor the battery level and charge the device promptly when the battery is low to prolong its lifespan.
Avoid using fast chargers, as they may damage the device.

General Care

Keep the radio dry and away from extreme temperatures.
Clean the device gently with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
Protect the antenna interface from physical damage.

Troubleshooting

Common Issues and Solutions

No Power: Ensure the device is fully charged and the power switch is in the 'ON' position.
Poor Reception: Check that the antenna is securely connected and fully extended. Try repositioning the radio or using the rotatable loop antenna for better signal acquisition. For FM, ensure headphones are properly connected if used as an antenna.
No Sound: Verify the volume level is not muted or set too low. Check headphone connection if applicable.
Device Damage after Firmware Update: This product is open-source, allowing for firmware modification. However, damage resulting from updating with unofficial firmware is the user's responsibility. The seller does not assume responsibility for such damage.
Wi-Fi Connectivity Issues (Metal Case Version): The metal casing provides shielding against electromagnetic interference, which can inadvertently weaken Wi-Fi signal strength. This is a characteristic of the material and not a defect.

Specifications

Feature	Detail
Brand	AMNVOLT
Model (Hardware Version)	V4
Main Controller	ESP-32-S3 (Genuine ESP32-S3-WROOM-1-N16R8)
DSP Chip	SI4732
Case Material	Metal or ABS Plastic injection molding
Operating Modes	FM / AM / LSB / USB (Does not support Air Band)
Reception Bands	HF / SW / MW / VHF
Frequency Range	LW, MW, SW (150kHz - 30MHz), VHF (64-108MHz)
Screen	1.9-inch IPS color screen, 170*320 resolution
Screen Brightness	32~255 levels, adjustable
Speaker	Built-in 1W power cavity speaker
Headphone Amplifier	Built-in
Hi-Z Circuit	Built-in, upgraded for weak signal resolution
Charging Port	TYPE-C (5V/0.5A, no fast chargers)
Audio Jack	3.5mm 3-pin stereo
Antenna Connector	SMA-KE (Female, Inner Hole)
Battery Capacity	800mAh
Included Antennas	Telescopic Whip Antenna, Rotatable Loop Antenna

Warranty and Support

Firmware Updates

The AMNVOLT V4 radio supports firmware updates. The pre-installed firmware version is at least VER.2.3.1. Due to frequent updates, it is recommended to check for and update to the latest firmware upon receipt for the best experience. Firmware upgrade tutorials and resources can be found on the official open-source project website: https://atsmini.github.io/.

Open Source Product Notice

This product is open-source, allowing users to modify and design the firmware. However, if the device is damaged due to the user updating unofficial firmware, the user is responsible for repairs. The seller does not assume responsibility for issues arising from unofficial firmware modifications.

Additional Documentation

For more detailed information and guides, please refer to the comprehensive user manual PDF available here.

User Tips

Firmware Check: Although the radio comes with the latest V4 hardware, firmware updates are frequent. Always check the official website (https://atsmini.github.io/) for the newest firmware to ensure you have the most up-to-date features and performance enhancements.
Headphone Antenna: When using wired headphones as an FM antenna, longer headphone cables tend to provide better reception, especially in areas with weaker signals.
Case Material Consideration: If you opted for the metal case version, be aware that while it offers enhanced durability and EMI shielding, it might slightly reduce Wi-Fi signal strength compared to the ABS plastic version.
Not a Scanner: The AMNVOLT V4 is a multi-band receiver, not a scanner. It is designed for receiving radio signals across various bands and modes, not for rapidly sweeping frequencies like a dedicated scanner.