TL;DR
There’s a brand-new 64-bit WSPR-zero image purpose-built for the Raspberry Pi Zero 2W and based on Raspberry Pi OS “Trixie.”
👉 Download the 64-bit Image: wspr-zero.com/downloads
NOTE: With the Raspberry Pi Zero 2W on this 64-bit image, an HDMI dummy plug is no longer required.
What’s new
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Native 64-bit Trixie base
Modern packages, cleaner future updates, and great stability on the Zero 2W. -
Transmit-only, simplified
We’ve removed receive functionality to keep WSPR-zero lean, predictable, and power-efficient in the field. -
Updated WsprryPi-zero codebase
The transmitter core has been updated for timing on 64-bit Pi Zero and recompiled for this release. Source:github.com/zinkwazi/WsprryPi-zero. -
No HDMI dummy load
Headless boots are happy on the Pi Zero 2W with this image—one less dongle to carry. -
Proven 24×7 stability
The image is tuned for unattended operation and long runs.
Which image do I use?
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Pi Zero 1.1: use the 32-bit image.
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Pi Zero 2-W: use the 64-bit image (this release).
Quick start
- Image the SD card with Raspberry Pi Imager.
- Pre-configure your Wi-Fi and SSH in Imager’s OS customization.
- Boot the Pi Zero 2W (no HDMI dummy needed).
- EZ-Setup will start automatically on bootup and is indicated by the flashing LED
- Enter your station details (call sign, grid, band, cadence).
- Attach an appropriate antenna to your WSPR-zero board.
Tip: WSPR needs accurate time slots—keep NTP enabled or use an RTC if you’re fully off-grid.
Good operating habits
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Power quality: clean 5 V supply to avoid clock jitter.
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Thermals: Zero 2 W runs cool, but a small heat spreader helps in hot enclosures.
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RF hygiene: always follow local regulations and FCC license rules.
FAQ
Do I still need an HDMI dummy plug?
No—not on the Pi Zero 2 W with the 64-bit Trixie image.
Can I upgrade my old card?
No. Flash a fresh card and run EZ-Setup.
Where’s the TX engine from?
From our updated and recompiled WsprryPi-zero fork, with 64-bit timing adjustments for the Pi Zero 2 family.
Where do I get the image?
👉 wspr-zero.com/downloads
Final notes
WSPR-zero is built for portable, low-power, reliable transmitting – perfect for backpacks, travel, or a quiet corner of the shack. Standardizing on the Pi Zero 2 W + 64-bit Trixie keeps things super cheap, simpler, sturdier, and truly set-and-forget.
See you on the map—73, K6FTP.