Re: [chrony-users] GPS/PSS hardware

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Yes, this is totally possible and the equipment ect. does exist.....but what may I ask is the difference between hooking equipment "x" up to your server and having a raspberry PI attached to it......?

You are still going to have to hook up some equipment regardless, correct...or am I missing something....

I have the exact build you describe from uptronics below, (although I use the newer much smaller GPS they have on offer) and it works very well.....

     remote                                   refid st t when poll reach   delay   offset   jitter
*SHM(1)                                  .PPS. 0 l    9   64  377   0.0000  -0.0685   0.0399 xSHM(0)                                  .GPS. 0 l    9   64  377   0.0000 -112.395   1.3963                         .POOL. 16 p    -   64    0   0.0000   0.0000   0.0019             3 u   78  128  377  21.2007  -1.7077   1.8072       2 u   30   64  375  41.9868  -0.2644   1.0297   3 u   63   64  376  40.1422   1.1676   1.1980 2 u    5  128  377  31.1699   2.4556   0.9245           2 u   80  128  377  38.9460   4.6676   0.6918    2 u   37  128  377  61.9936   1.1824   2.1731             2 u   28   64  375  59.9884  -1.8464   1.3485

If you have any questions about my setup I would be more than happy to answer but for around $100 usd it's hard to beat....


On 05/08/2018 06:06 AM, Bill Unruh wrote:

On Tue, 8 May 2018, Nicolas Embriz wrote:

Hi, I would like to build/test a stratum-1 server, I have found articles about how to do that with a raspberry PI and boards like

But wondering if there is hardware/devices that could be attached via USB and connect to an existing server.

USB is possible but not ideal. The interrupts are soft interrrupts (ie done by sending signals on the usb in software rather than some hardware line.) Best is if your system has some hardware line (eg serial port or parallel port) to use. Of course that depends on what kind of accuracy you want. If it is ms
then a serial to usb converter will certainly work, and even just the GPS
signal on the usb might be fine. If it is sub-ms you want, then a hardware
interrupt is needed.
Or your desktop server might already have a serial port, and you can use that.

Any recommendations?

Thanks in advance.

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