[time-nuts] Precision Time Protocol – Windows 10 implementation

[David J Taylor]

From: Adam Kumiszcza

First of all, thank you for the info you put on satsignal.eu org! I've used
some of these in the initial configuration of my server.

By feeding PPS signal to the Windows PC you mean adding cards or connecting
boards (like Sure Electronics GPS evaluation boards) to Windows computers?
My idea was to lower the time offset of machines connected by LAN to a
single stratum-1 server. But maybe I'll come to that later.

Out of your monitored servers on
https://www.satsignal.eu/mrtg/performance_ntp.php I am amazed by
performance of LeoNTP box. What do you mean by indoor antenna here?

Best regards,
Adam
_______________________________________________

Adam,

One thing - I note you say "single stratum-1 server".  With GPS/Raspberry Pi 
being so cheap, why not have several servers each with a separate antenna?

You already have a PPS signal from your existing GPS, so I was thinking 
simply of distributing that the the Windows PCs, and feeding it to the 
serial port's DCD signal.

If the PC doesn't have a serial port, check on the motherboard because there 
are sometimes serial port headers left unconnected by the PC manufacturer. 
If it doesn't have such a header, add a serial port card.  If it's a laptop 
then you might use a serial-over USB connection, but that's likely either 
not to carry the serial control lines, or be of inferior performance to 
other methods.

LeoNTP - my shack is on the second floor of a UK 2-storey house, and the 
antenna for the LeoNTP is a magnetic-mount standard puck antenna, mounted on 
the base of an desk light which is actually on top of a loudspeaker, so the 
antenna is near the roof but indoors.  Check with your Android mobile phone 
what the GPS signal levels actually are in your possible locations - I think 
Apple don't allow you to access that information.  For this level of 
performance there's no need for timing antennas.  My other GPS antennas are 
simple on a window sill on a south-facing, second floor window.

  http://www.satsignal.eu/ntp/2019-01-08-1330-23b-GPS-antenna-farm.jpg

The key here is to have some conducting magnetic material under the antenna, 
not just sitting on its own.  There's more about the LeoNTP here:

  http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=272

Cheers,
David
-- 
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Email: david-taylor at blueyonder.co.uk
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