[ntp:questions] Can NTP sync within 1ms

Rob nomail at example.com
Mon Apr 28 09:01:46 UTC 2014

William Unruh <unruh at invalid.ca> wrote:
> On 2014-04-27, Rob <nomail at example.com> wrote:
>> jimp at specsol.spam.sux.com <jimp at specsol.spam.sux.com> wrote:
>>>> The listeners should enjoy a smooth reception while driving around.
>>>> So of course there should be no time lag between the modulation signals
>>>> of the different transmitters.  Experts in the field tell us we should
>>>> be within 12us.
>>> Unless I fat fingered the calculator, that means the difference in distance
>>> between transmitters relative to the receiver can be no more than 3.6 km.
>>> 300 meters per microsecond; it is the law...
>> The goal is not to have 12us difference in arrival time, but to be
>> within 12us for transmission time.
> Why not within 12 psec? Ie, what is the reason for this requirement? 
> And I thought this thread started with 1ms.

I have hijacked this thread that was started by someone else who
asked if "Can NTP sync within 1ms".  As usual on usenet, after some
postings the topic drifted away.

The 12us figure has been mentioned by two independent persons that
are experts in the field of co-channel diversity networks and have
implemented such networks in the past for professional purposes.

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