SmartStreamer4 - CW Skimmer and Digital Modes for FlexRadio

Download v0.3.1

Windows
64-bit zip76.7 MB

Released 2026-08-05. SHA-256 checksum · Release notes. SmartStreamer4 is free and MIT licensed.

What it does

SmartStreamer4's Launch tab in the Dark theme, connected to a FlexRadio station, showing two discovered stations with a slice each and the CW and Digital mode list.

The SmartDeck control panel in the Dark theme, showing slice A on 14.055.000 MHz in CW, band buttons with 20m selected, RX and TX antenna buttons, RF gain, AGC-T, and TX power steppers, and a row of forward power, SWR, temperature, and voltage readouts.

CW Mode streams DAX-IQ audio into CW Skimmer, with per-slice instances synchronized to your panadapter and slice frequencies, and decoded spots reconciled back to the radio.
Digital Mode configures and launches per-slice WSJT-X, JTDX, or WSJT-Z instances for FT8 and FT4, wired to DAX audio and SmartSDR CAT.
SmartDeck is a compact control panel you can park beside SmartSDR: live power, SWR, PA temperature and voltage, band buttons that remember the frequency, mode, and antennas you last used, and steppers for RF gain, AGC-T, and TX power.
Light and Dark themes, switched from the tab strip and remembered between sessions. The app opens in Light; the screenshots above are Dark.
A setup wizard opens on first launch and walks you through the CW Skimmer configuration.
Checks for new releases and links to the release notes from the Help tab.
A single self-contained executable: no installer, no .NET setup. Settings live in %APPDATA%\SmartStreamer4 and survive updates.

SmartStreamer4 needs Windows 10 or 11 and SmartSDR 4.x with DAX installed on the same PC. CW Mode needs CW Skimmer; Digital Mode needs WSJT-X, JTDX, or WSJT-Z.

Installing

Unzip the download and run SmartStreamer4.exe. There is no installer. Allow firewall access if Windows prompts. Windows SmartScreen may warn the first time because the app is not code-signed: choose More info, then Run anyway.

Updating from any earlier version, including the v0.1.x betas, works the same way: replace the executable and run it. Your settings are kept.