AMNVOLT V4 ATS MINI SI4732 Radio ALL Band DSP Radio FM AM SSB LSB USB Receiver with Added the Wired Headphone Feature

Please note:

This product does not support the aviation frequency band!!!

Official Description for V4/V4B Version:

1. Basic Concepts of the Version:
V4 represents the fixed model of this radio receiver; V4B merely refers to the latest production batch number of the motherboard of the V4 series, and it is not an independent model of the entire machine. The silk-screened logo on the motherboard still indicates V4 and will not have the "V4B" label printed.
The panel, printed text on the motherboard, outer packaging, and product labels all uniformly use the series identifier "V4" for production. It is impossible to determine the motherboard batch by appearance or component printed text.

2. Unified Description of Available Batch Levels:
Starting from the beginning of 2026, the motherboards of the V4 models have completed the upgrade switch and are all using V4B batch motherboards. Currently, all in-sale AMNVOLT V4 series products: those with the product title marked as V4 or V4B, and the printed text on the body / motherboard / packaging label as V4, all fall within the normal situation. The internal motherboards equipped are all of the V4B new batch design, and there is no mixed distribution of new and old batches.

3. Version Verification Method:
After receiving the goods, if you want to confirm the actual batch of the motherboard, you cannot check the printed text of the components. Please refer to the accompanying graphic tutorial to verify the hardware details.

4. Clarification of Common Questions:
Recently, many users have found that the body, motherboard, and packaging only have "V4" printed, mistakenly believing they received old batch products. This is hereby clarified: The letters on the motherboard silk-screening and the overall appearance of the machine have been printed with the V4 identifier as the established design. The currently purchased in-sale models actually have internal motherboards of the V4B batch. Please rest assured to use them.

V4B Upgrade Contents:

1. A shielding cover is added to the Si4732 receiving part to suppress electromagnetic interference; an ESD protection chip is added at the antenna input end to ensure safety.
2. The Hi-Z circuit is moved to the front end of the antenna path and a more stable VCC_RADIO power supply is adopted to retain signal resonance and reduce noise.
3. A function of using a wired headset as the FM antenna has been newly added (the headset is not included in the shipping list. Please have the buyer prepare it themselves; it should be used in an environment with a strong FM signal and the headset cable should be relatively long for better performance).
4. The left and right channels have been swapped; at the same time, the parameters of the power amplifier and the speaker have been re-adjusted to improve the sound quality.
5. More expensive and superior components have been replaced: a more sturdy and durable telescopic antenna, and a more comfortable and anti-slip knob cap.
6. The motherboard hardware directly supports the H.J.Berndt firmware. No additional soldering or modification of the motherboard is required, and the official firmware will be pre-installed by default. After receiving the device, you need to manually update to the H.J.Berndt version of the firmware. The firmware developed by H.J.Berndt includes functions such as RTTY/CW decoding.
7. Since 2026, the hardware of this radio has been upgraded to the V4B version. This version can directly support the H.J.Berndt firmware without additional soldering or modification of the motherboard. However, it should be noted that the radio will be pre-installed with the official firmware by default instead of the H.J.Berndt firmware. After receiving the device, you need to manually update to the H.J.Berndt version of the firmware. The firmware developed by H.J.Berndt includes functions such as RTTY/CW decoding.

Regarding the hardware version:

1. The mainboards of all currently available AMNVOLT V4 versions of the ATS MINI radios on the market are actually V4B.
2. We have not changed the printed "V4" on the casing and the mainboard, but in fact, the mainboards have all been upgraded to the V4B version. Please rest assured to purchase and use it.
3. How to identify if the radio you receive is the V4B version: Ignore the printed words and directly check the reference diagram. If the corresponding position matches this diagram, it is V4B.

Features:

1. Utilizes an ESP32-S3 main controller + SI4732 DSP chip. Supports ALL Band reception, LSB, USB, AM, FM modes, and features AGC/ATT functionality.
2. Equipped with a 1.9-inch high-definition IPS color screen, supports adjustable backlight brightness, and displays battery level.
3. Built-in 1W power cavity speaker delivering loud and clear audio quality.
4. Supports upgrading to the latest firmware. Pre-installed firmware version is at least VER.2.3.1 (Due to frequent firmware updates, please check the user manual and update to the latest firmware upon receipt for the best experience).
5. Built-in headphone amplifier circuit ensures loud volume when using headphones.
6. Built-in Hi-Z circuit enhances weak signal resolution.
7. Insists on using genuine ESP32 modules (ESP32-S3-WROOM-1-N16R8), unlike counterfeit modules used in other clone models.

Specifications:

Brand: AMNVOLT
Model (Hardware Version): V4
Case Material: Your choice of Metal or ABS Plastic injection molding.
Main Controller: ESP-32-S3
Operating Modes: FM / AM / LSB / USB (Note: 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, 170*320 resolution
Screen Brightness: 32~255 levels, adjustable
Charging Port: TYPE-C (Cannot use fast chargers for charging)
Audio Jack: 3.5mm 3-pin stereo
Antenna Connector: SMA-KE (Female, Inner Hole)
Battery Capacity: 800mAh

Package List:

1 x AMNVOLT V4 Radio
2 x Antennas (Telescopic Whip Antenna / Rotatable Loop Antenna)

Please note when purchasing：

1. Headphones are NOT included in the package. The headphones shown in pictures are for demonstrating the FM antenna function only. Please prepare your own headphones!
2. If you select the metal case version, please be aware that the aluminum material provides some shielding against wireless electromagnetic signals. While this improves reception against interference, it can also weaken the Wi-Fi connection strength. Please consider this before purchasing.