[time-nuts] Checking Time difference between PCs

Chris Albertson albertson.chris at gmail.com
Fri May 24 01:04:22 EDT 2013

Run NTP on each PC.  The use the ntpq command to print out a nice table.
Simply using NTP on Windows will force the clocks to be without about .002
seconds.   That is about as good as you can do using Windows.    BSD or
Linux can get about 2 uSec.  NTP software is free and not hard to set up.
The "billboard that ntpq prints out shows clock offsets on milliseconds (to
.001 mSec) as well as "jitter" in the same units

On Thu, May 23, 2013 at 2:26 PM, Rex Moncur <rmoncur at bigpond.net.au> wrote:

> I wonder if anyone has suggestions as to how to check the timing variations
> between two PCs that are running windows.
> The background to this request is that I am running two instances of the
> Weak Signal Program WSJT on the same computer and get variations of +/-0.2
> seconds.  It has been suggested that the variations might be caused by the
> windows operating system.  As a check on this I am proposing to run two PCs
> locked by GPS-18 USB and set by NMEATime which should show the difference
> on
> WSJT.  But is there some program that will show the difference due to the
> PC
> clocks alone? Or perhaps a program that outputs the PC time as a pulse on a
> sound card so I can compare these on a CRO.
> Regards Rex VK7MO
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Chris Albertson
Redondo Beach, California

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