HamClock

Pre-Built Images · flash and go

Ready-to-flash HamClock images

Write one to an SD card, boot your Raspberry Pi, and you're running — already pointed at hamclock.com. No command line, no building, nothing to configure but your call sign.

Pick your board

Downloads

Each image is built for one Raspberry Pi model at 1600×960. Not sure which you have? It's printed on the board near the USB ports.

Tested vs experimental. Images marked Tested were flashed to a fresh card and booted on real hardware before release. Experimental images are built but not yet flash-verified — they should work, but flash one only if you're comfortable troubleshooting. Flashed one? Please let us know if it works — a quick note tells us it's safe to mark Tested for the next person, and we'll thank you for it.

How to flash it

Writing the image to a card

You need a microSD card (16 GB or larger) and a card reader. The easy way works the same on every operating system.

The easy way — Raspberry Pi Imager (Windows, macOS, Linux). Don't unzip the file. Imager reads the .img.xz directly.

Raspberry Pi Imager

  1. Install it from raspberrypi.com/software.
  2. Choose Device → your Pi model.
  3. Choose OS → scroll down to Use custom → select the downloaded .img.xz.
  4. Choose Storage → your SD card. Double-check this — it erases the card.
  5. Write. When it finishes, put the card in your Pi and power up.

Prefer the command line, or want to verify before you write? Pick your OS:

Windows has no built-in dd, so stick with Raspberry Pi Imager or balenaEtcher above — both take the .img.xz as-is. You do not need to extract it. (Windows 11 can extract .xz in Explorer, and 7-Zip handles it everywhere — but extracting just makes a bigger file and an extra step.)

Verify your download in PowerShell or Command Prompt:

certutil -hashfile hamclock-pi4-1600x960.img.xz SHA256

Compare the result to the SHA-256 listed on the download above.

After it boots

First-boot setup

  1. Connect the Pi to a display and your network, then power on. It boots straight into HamClock.
  2. Enter your call sign and your grid square (or latitude/longitude) when prompted.
  3. That's it — it's already pulling live data from hamclock.com. If the version number turns red later, double-click it to update.

Rather build it yourself, or running a different board? See Build Your Own. Got an Inovato Quadra? See Convert an Inovato.

Did it work? Tell us how the image ran on your hardware — what booted cleanly, what didn't. Your report is how an Experimental image becomes a Tested one.
Let us know →