AMNVOLT V4 ATS Mini SI4732 Radio ALL Band DSP Radio FM AM SSB LSB USB Receiver built-in Hi-Z Headphone Amplifier Circuit

New Features From 2026 AMNVOLT V4 hardware natively supports H J Berndt firmware without extra soldering or motherboard modifications and ships with official firmware pre installed by default You need to flash the H J Berndt version manually after receiving the unit and this firmware developed by H J Berndt includes functions like RTTY CW decoding V4 V4a and V4b are simply version batch differences they have the same functionality Batch issues are not covered under warranty This information was updated on March 26 2026 Important Note The device ships with official firmware pre installed by default If you need to use the H J Berndt version you need to flash it yourself after receiving the V4 unit About this firmware Developed by H J Berndt this firmware is equipped with multiple functions including RTTY CW decoding V4 Update Content 1 Added a shield to the Si4732 receiver to suppress electromagnetic interference Add an ESD device to the antenna input to protect the chip 2 The Hi Z circuit has been moved to the front of the antenna path and uses a more stable VCC RADIO power supply to preserve signal resonance and reduce noise 3 Use wired headphones as an FM antenna headphones are not included in the shipping package this requires use in an environment with a strong FM signal and a long headphone cable for optimal performance 4 The left and right audio channels have been swapped the amplifier and speaker parameters have also been retuned to improve sou