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New release 1.3.0

Derp Productions CB Fork

FT8 for CB radio, built on WSJT-CB. It runs on Windows 7 to 11, handles longer CB callsigns, and picks up your existing settings and logs when you install it.

Download 1.3.0What's new

Free and open source (GPLv3). Opens the MediaFire download page.

Derp Productions CB Fork 1.3.0
Derp Productions CB Fork 1.3.0 startup screen with credits and support details
Hero screenshotSave as assets/img/screenshots/cb-fork-main.png

Still on the original WSJT-CB 1.5.0? That release is no longer supported. Replace it with the latest Derp Productions CB Fork. Your settings and logs come across automatically.

Windows 7 to 11

64-bit and 32-bit installers. Runs natively, including on older and slower PCs.

Longer CB callsigns

Up to three letters and four digits after any prefix, like 123ABC1234. Event calls like 330AT/SC2 work too.

Keeps your data

On first start it copies your settings and logs from the program you already use. Nothing is moved or changed.

Why it exists

Built for family.
Now running on 60+ stations.

He's been on radio for over 20 years, on older hardware, and I'm usually his tech support. The CB Fork started as a way to make that easier for him. Then other operators wanted it too.

DoubleDerp Read the full story

What's new

Event callsigns, an event calendar and a new dark mode

  • Event callsigns, like 330AT/SC2, with their own on/off box in Settings
  • Offline event calendar that works out Easter dates for you
  • New dark mode in Derp Productions colours, with easier-to-read text
  • Red border on callsign boxes when an entry isn't valid
  • A status-bar note when an older-version station can't send your report

Patched 6 Nov 2026: fixes for a few UI and scaling issues. Already on 1.3.0? Download it again to get the fixes.

With the new event options switched off, sending and receiving work exactly as in 1.2.1. Full release notes

Screenshots

See it running

Screenshot slotSave a screenshot as
assets/img/screenshots/cb-fork-1.png
Main window in the new dark mode
Screenshot slotSave a screenshot as
assets/img/screenshots/cb-fork-2.png
Settings: a long callsign, plus the new event callsign box
Screenshot slotSave a screenshot as
assets/img/screenshots/cb-fork-3.png
Event calendar with Christmas and Easter set up
Screenshot slotSave a screenshot as
assets/img/screenshots/cb-fork-4.png
Tools menu: old-version compatible mode and the event calendar

Credits

Built on WSJT-CB and WSJT-X

All credit for the original program goes to these developers. Every version of this fork is based on official WSJT-CB 1.4.1.

WSJT-CB
Lorenzo 1AT106, Pietro 1XZ732, Alex 1AT1989 and other contributorsOfficial WSJT-CB pageSource code on GitHub
WSJT-X
Joe Taylor K1JT and the WSJT Development GroupWSJT-X website
This fork
Derp Productions, AustraliaEmail fork support

This is an unofficial fork. Derp Productions has no association with the WSJT-CB or WSJT-X developers, and they don't support it, so please send problems with the fork to us, not to them.

Derp Productions only claims ownership of the name “Derp Productions CB Fork”. The fork is shared under the same GNU GPLv3 licence the original developers chose, and the complete source code is included in every download.

Support

Found a bug or want a feature?

Email Derp Productions, not the WSJT-CB developers. Tell us your Windows version and what you were doing when it happened.

Email supportDownload 1.3.0