2 ms·
> If you want to overcomplicate it you could put rPi into it and sync the 50Hz clock to NTP That’s ridiculous! Buy a little GPS-disciplined oscillator and eit
by amluto 3y ago
> If you want to overcomplicate it you could put rPi into it and sync the 50Hz clock to NTP
That’s ridiculous! Buy a little GPS-disciplined oscillator and either scale the PPS output up to 50Hz or use a PLL to derive 50Hz from the oscillator output :)
- BenjiWiebe 3y agoJust use a pll to derive 50 from 60. Problem solved.
- zbrozek 3y agoThe GPSDO will also give you correct time of day and unwavering frequency. I used to have one set up at home to feed my test equipment a 10 MHz reference.
- chromoblob 3y agoBut how do GPSDO work? Is GPSDO susceptible to metastability?
- zbrozek 3y agoGPS is a system for distributing time first and a means of computing position second. A GPSDO is typically a PLL that uses the recovered timebase as a reference input and will have an incredibly slow loop filter. It can be outrageously highly damped and stable. Such clocks are the basis of the cell network and have made doing client handoff between towers almost easy. The hard part is operating through GPS denial (mostly due to weather).
- ilyt 3y agoIf you're powering 50/60Hz clock you won't be setting time remotely on that easily