Pocket SI4735 Firmware Update – Smarter Reception and Longer Battery Life
The Pocket SI4735 Dual Core decoder has received a significant firmware upgrade that makes everyday listening more informative and far more efficient. The update focuses on three main areas: better use of EiBi transmitter data, flexible manual time control, and a new ecological power-saving mode for the ESP32-S3 platform. Together these additions refine the user experience without complicating operation.
Integration of EiBi extensions
One of the most noticeable changes is the integration of EiBi extensions. After performing a frequency search, the receiver now shows the transmitter location in clear text taken directly from the EiBi database. Instead of cryptic identifiers, listeners can immediately see where a station originates. The firmware also reads the geographic coordinates from the same source and calculates the distance to the transmitter in kilometers. This small detail adds real context, especially for shortwave enthusiasts who enjoy tracking how far a signal has travelled.
Manual time and date entry
Another practical improvement is manual time and date entry through the built-in numpad. Previously the device relied mainly on RDS data to set the clock, which was not always available on every band or in weak reception conditions. Users can now test reception at any chosen moment of the day by entering the correct time themselves, ensuring that transmitter schedules are displayed accurately even when no external time signal is present. This makes midday tests and field experiments much easier.
Power-saving mode
The firmware also introduces an ecological extension aimed at reducing power consumption. A new Slow/Fast switching option adjusts the clock frequencies of the ESP32-S3 microcontroller while keeping full radio control. Measurements show roughly sixty-two percent longer battery life in the economical setting, a welcome gain for portable operation. For travelers and outdoor listeners, the receiver can now run noticeably longer between charges without sacrificing stability.
These enhancements demonstrate how software can breathe new life into existing hardware. Clearer transmitter information, dependable manual timing, and intelligent energy management turn the Pocket SI4735 into a more capable companion for daily listening. Owners can update their devices using the latest files provided on the project page and immediately benefit from the expanded features.
The evolution of the firmware continues to reflect the needs of real radio hobbyists: practical tools, transparent data, and efficient performance. With this release the Pocket SI4735 becomes not only easier to use, but also better suited for long sessions away from the power outlet.
Full details and the current firmware package are available on the project page at http://www.hjberndt.de/dvb/pocketSI4735DualCoreDecoder.html#transmitter.
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