I was trying to figure out why the Raspberry Pintp4 from my post on NTP accuracy, a Raspberry Pi CM5 on my desk’s time isn’t as accurate as the time coming from the PC that’s sitting next to it. I was looking at some statistics, and found something fascinating. On one level, the two systems are basically identical. They’re both running Ubuntu 24.04. They both have on-board GPS devices with PPSPulse Per Second — the GPS chip blips a signal exactly when each second starts. Or as exact...
