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TrueTime Pi Mounting Bracket — image 1
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TrueTime Pi Mounting Bracket

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A mounting bracket to restomod a TrueTime XL or XL-AK GPS Time server with a Raspberry Pi 5.

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Model information

Category
Computers
License
Creative Commons — Attribution — Share Alike

This bracket can be screwed directly into a TrueTime XL or XL-AK GPS and Frequency Time Server, and allows you to 'restomod' it with a Raspberry Pi 5.

The Pi must be installed inside a Raspberry Pi 5 Bumper Case to fit, and even though this bracket blocks airflow to the bottom of the Pi, that seems to help the built-in oscillator's frequency stability. I also made sure to run a Pi heatsink fan at a 50% duty cycle, and keep the lid on the TrueTime for even more stability.

I used a DeskPi KL-P24 USB-C and HDMI right-angle adapter to put those ports out the back, and used a short SMA extension to put the GPS antenna connection out the back as well. The two standoffs take M2.5 screws which should be included with the KL-P24. The Pi itself should be a friction fit with the Pi Bumper.

My final print used Polar Filaments Retro Platinum PLA which almost exactly matches the beige color of my 1995 TrueTime XL-AK.

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