A vintage True Time XL-AK GPS time server, purchased in June, was restored using a Raspberry Pi 5 and a GNSS HAT. The project began after a similar device caused a major outage in Australia, highlighting the importance of precise timekeeping. The restoration involved replacing the original hardware with modern components, including a Pi 5, a GNSS HAT, and custom software.

The system now runs as a stratum 1 NTP server, providing accurate time to a local network. Key steps included installing the GNSS HAT, configuring Chrony to use GPS and PPS signals, and optimizing the Pi's performance for stable timekeeping. The project was completed in time for VCF Midwest, where the server will be showcased.

The article details the hardware setup, software configuration, and performance tweaks, offering a practical guide for similar restorations.