[time-nuts] wifi with time sync

Bob Camp kb8tq at n1k.org
Fri Jan 13 16:03:25 EST 2017


Hi

That *assumes* that NTP is installed on the laptop.

Bob

> On Jan 13, 2017, at 3:45 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
> 
> Short answer:  See man page for ntpq
> 
> Longer...
> 
> First run NTP then after some time (15 minute to an hour) at the command
> line time type "ntpq -p"
> 
> "ntpq" will query NTP for timing statistics.  It will report the average
> delay between the local computer and the set of reference clocks (other
> servers) that NTP is connected to.  Along with the average delay you get
> variation in that delay (std dev?)    Note the if NTP can calculate the
> delay, it has already compensated for it.   It is only the uncertainty of
> the compensation that matters, hence the need to report the variation.
> 
> The data shows the total delay and variation over the network and the
> reference clocks might be thousands of miles away.  So you might want to
> run one on say your wifi router or a local computer with hardwire
> connection to the router then you'd see the effect of only your wifi.
> 
> 
> 
> On Fri, Jan 13, 2017 at 12:35 PM, Bob Camp <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> What standard protocol would you recommend I run from the command line on
>> my computer
>> to get a quick estimate of the timing lag and variablilty  on my
>> particular WiFi connection?
>> 
>> Bob
>> 
>>> On Jan 13, 2017, at 3:25 PM, John Hawkinson <jhawk at MIT.EDU> wrote:
>>> 
>>> Can we please stop talking about pings?
>>> 
>>> Bob Camp <kb8tq at n1k.org> wrote on Fri, 13 Jan 2017
>>> at 15:12:38 -0500 in <C88C78A6-A015-4DCC-9E23-394DC33A3470 at n1k.org>:
>>> 
>>>> I’m sure you are right about the response time. Right now the
>>>> variation is running almost 3 ms at one sigma on a ping so there is
>>>> a lot to do simply to get the accuracy anywhere near 1 us.
>>> 
>> 
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> 
> 
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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