Anyone in the forum tried this server?
It looks cheaper than competitors.
I was looking at it too, just today.
But I found, or I’m wrong, it has no PPS.
They say it’s >1ms accurate, that is not what a PPS Stratum 1 server is, that is about <100ns accurate.
Nice box…but I won’t buy it. And yes, I looked at it today too 
They don’t specify if they use PPS internally to sync the NTP server, but yeah there doesn’t seem to be a raw NEMA/PPS output.
Regarding the precision/stratum: IMHO Stratum 1 just means that the NTP server is synced to a reference clock (GNSS in this case), there is no guarantee for a particular synchronization performance.
I mean I hope nobody relies on dialup once a day to one of the national laboratories by phone to sync their server in 2025, but from a clock hierarchy perspective your free-running clock with daily dialup to a reference clock would be S1 
Anyone can suggest me a ready to use gps server with these prices?
@NTPclock What are your goals with it? For relatively inexpensive high performance NTP Pool servers the LeoNTP servers are popular. Meinberg, of course, are popular for commercial and industrial uses but they’re in a different class.
My aim is to become a reliable source stratum 1 source on for the place where i live.
You can get an Arduino GPS+PPS module for 20 bucks on Amazon. If you don’t have serial, you can buy a serial to USB cable. You plug it in to your server and use gpsd + chrony/ntpd to get time and PPS signal. Resolution is most of the time pretty good. Make sure you get an outdoor antenna for it. This is what I use for my NTP server at https://ntp.teambelgium.net/
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I have Raspberry pi 4b and Dell Mini PC with very good cpu. I have stuck here because chatgpt told me ready to use NTP would be better and it will have less delays. That’s why i have eliminated Raspi and Mini PC with GPS extension.
Build your own server, but make sure it has RS-232 port.
Then buy a Garmin 18x LVC 1Hz GPS, they are really good….but a tad expensive, about 90 euro.
However, they are easy to connect to RS-232 + USB (for 5V powersupply).
They also come with a lot of cable (5m) so easy to mount outside and the base has a screw+magnetic and on top water-resistant.
Any NUC will do as long as it has RS-232 port.
The Garmin performs very well.
Other options are the cheap GPS+PPS modules, but you can’t place them outside without a waterproof box.
A refurbished HP Elitedesk will (best with Intel CPU!) set you back about 150 euro, it has RS-232.
90 euro Garmin….so for about 240 euro you have a PPS Stratum-1 server….tiny bit of soldering needed….2 euro 
LeoNTP are twice as expensive then my suggestion and has only 100mbit port.
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Are you ok running chrony and i’m not sure my ISP fiber will establish a 7/24 connections there might be some very small drops (not very much) (maybe %99,98 uptime) so will these small cuts it be a problem for a stratum 1 server?
No, as the GPS+PPS make sure it keeps perfect time.
Because it did know the correct time, and GPS+PPS keep it perfect until you need restart AND have wrong settings.
Other then that, ik can run perfectly without any internet at all.
It’s just that the settings need to be right, so it/you know it’s using the correct stuff comming out of the GPS.
I have been fighting a Garmin 5Hz GPS for a bit, as Chrony had problems to work out the correct time. I DO NOT recomment any GPS+PPS that does more then 1Hz PPS.
Short answer to your question: NO!
Don’t listen to ChatGPT. Listen to folks on here that have years of experience of running NTP servers. Unless you’re some big corpo or ISP, getting a dedicated NTP server like from Meinberg or others is often overkill.
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You could get a Pi 5 with a GNSS hat (make sure it has PPS). The Pi 5 has a network adapter that supports hardware timestamping, so should in theory be quite good. It also sips power, makes no noise (unless you put a fan on it) and barely takes up any space
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My Intel server doesn’t have fans either and uses less power then a RPi4.
Those Intel Jxxxx series CPU’s are quite good, fanless (most of them) and with a PicoPSU 0-fan.
To name some:
And you have many NUC’s that have no fans.
Often with RS-232 etc.
Or, unless you get one REALLY cheap.
Or you are the same nutter like the rest of us and like time
According to physics, time does not exist. It’s all in your head 
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