Metal Shell AMNVOLT V4 ATS MINI SI4732 DSP Radio All Band FM AM SSB LSB USB with Built-in Hi-Z Headphone Amplifier Circuit

V4 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 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.Basic functions:1. Utilizes ESP32-S3 as the main control unit and SI4732 DSP chip. Supports broadcasting across all bands, LSB USB AM FM modes, and includes AGC/ATT functions.2. Features a 1.9-inch IPS high-definition color screen, allowing for adjustment of screen backlight brightness and displaying battery level.3. Equipped with a 1W power speaker, delivering clear and pleasant sound quality.4. Supports firmware upgrade to the latest version. The factory-preinstalled firmware version is at least VER.2.3.1 (Due to frequent firmware updates, please update to the latest firmware as soon as you receive it according to the instructions to maintain the latest usage experience.)5. Includes an ear amplifier circuit, ensuring loud volume when listening with headphones.6. Features a Hi-Z circuit to enhance weak signal resolution.7. Continues to use the original ESP32 module (ESP32-S3-WROOM-1-N16R8), rather than counterfeit modules used by other cloned models.Parameters:- Brand: AMNVOLT- Model (version of the motherboard): V4- Shell material: Metal- Main control: ESP-32-S3- Operating mode: FM/AM/LSB/USB (Note: Not compatible with aviation band)- Reception frequency band: HF/SW/MW/VHF- Frequency range: LW, MW, SW (150kHz - 30MHz), VHF (64-108MHz)- Screen: 1.9inch, 170*320 resolution- Screen brightness: 32 - 255 levels, adjustable- Charging interface: TYPE-C (cannot be charged with fast charger)- Audio interface: 3.5mm three-section stereo- Antenna interface: SMA-KE (inner hole)- Battery capacity: 800maDelivery List:1 x AMNVOLT V4 Radio2 x Antennas (pole extension antenna / circular rotating antenna)Notes:1. Headphones are not included in the shipping list. The headphones shown in the picture are only for demonstrating the FM antenna function. Please purchase your own headphones!2. If you choose the version with a metal casing, the aluminum alloy material has a certain shielding effect on wireless electromagnetic signals. This will enhance the reception interference performance while also weakening the strength of the Wi-Fi signal connection. Please be aware of this before making the purchase.