Simon Brown, G4ELI, author of the popular SDR Console published a new beta build 4138 on July 26, 2026, within the 3.4 branch. This is a continuous release following the philosophy of 'release early, release often', which the project has long maintained – instead of rare major updates, smaller but frequent kits with specific fixes and improvements come.
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What SDR Console 3.4 brings
Build 4138 adds initial support for the Reuter RSR200B receiver and finalizes support for SDR Fobos – it is important to note that only Agile firmware is supported; some earlier units of Fobos SDR additionally had interchangeable markings HF1 and HF2 printed on the cover.
A significant space has been given to FFT computation optimizations. When using NVIDIA CUDA, the returned buffers are now allocated from the heap instead of pinned memory. The CPU load in the FFT Helper DLL has also decreased – data from FFT (CUDA, IPP, OpenCL) is processed to correspond to display points (DIP); during Broadcast-FM at 4-fold resolution, originally up to 550 FFT bins corresponded to one display point, which was computationally demanding especially with multiple active receivers in a matrix display. The new build subsamples these bins to a maximum ofapproximately 32, without affecting the display or DSP processing, but with a noticeably lower CPU load.
Loading frequency database into memory (memory-mapped backing) is now significantly faster.Pluto/LibreSDR has gained support for TX Doppler correction.The RDS editor received an optional font size, the forced large font for PS text has been removed, and the RDS Logfile is now updated even while the editor is open and visible.The format of the satellite definition file has changed - there is no need to change custom settings, but support for the new OMM (.xml) format has been added; the author is also moving satellite data to a new Akamai server, currently as a cache of Celestraku data.Soundduring broadcasting (audio mute) is now a setting at the individual profile level, not globally.
Among the errors, it is worth mentioning the crash when opening the matrix view during SDR operation, the crash when selecting 'Configure' in the radio selection window, and the removal of the error during the graphics driver restart.
The previous beta build from February 10, 2026 (3.4 Build 3972) fixed the FIR filter definitions for Pluto, which improved reception – this documents that the development of 3.4 has been ongoing in smaller steps since the end of 2025.
Development of SDR Console
SDR Console is developed by Simon Brown, G4ELI, continuously and over a long period. According to older release history, for example, version 3.1 the result of 6.5 years of development, with the main goal of reducing the load on both CPU and GPU and adding a voice keyer. The following version 3.2 brought a rewrite of part of the code into highly optimized assembler (machine code) with the same goal – to reduce the load on the processor when processing large bandwidth – along with improvements in support for Pluto and RX888 devices.
Branch 3.4 continues in this approach through regular beta builds published directly on the blog sdr-radio.com – among the recorded milestones are, for example, the build from November 1, 2025 (improvements to the Analyzer, faster saving and loading of projects, more display lines based on available RAM), from September 9, 2025 (support for the Simple-Radio-Control-Protocol for linking with logging programs) or from August 23, 2025 (support for Winradio IQ files over 4 GB and correct reporting of the actual transmission frequency during operation with up/downconverter, for example, when using QO-100). This continuous stream of smaller releases is a characteristic feature of the development of SDR Console – thus, the user does not have to wait for one major release every few years, but receives fixes and new features continuously.
Download links for SDR Console 3.4
Current beta kits for SDR Console are available on the page sdr-radio.com/download in the Beta section. Stable (release) versions are on the same page in the Release section. The program is available for Windows in both 32-bit and 64-bit versions. A complete overview of changes in all builds of branch 3.4 is published on the V3.4 Release Notes page on sdr-radio.com, older kits (v1.5 and v2.3) are archived on a separate page Old Kits.
Summary
Beta build 4138 of SDR Console 3.4 from July 26, 2026 primarily brings support for two new types of SDR receivers (Reuter RSR200B, finalized support for Fobos with Agile firmware), a noticeable reduction in CPU load when processing FFT data, and faster loading of the frequency database.