[ntp:questions] NIST vs. pool.ntp.org ?

Robert Scott no-one at notreal.invalid
Thu Mar 28 03:22:31 UTC 2013

On Thu, 28 Mar 2013 02:50:17 GMT, unruh <unruh at invalid.ca> wrote:

>He wants to calibrate the onboard clock on a  cellphone/tablet to about
>10PPM for an app he is writing to act as a tuner which is supposed to be
>better than 1 cent in its tuning ability. He is willing to spend a few
>hours on this (ie, the time accuracy needs to be about 10-100 ms), but then let the clock freewheel except perhaps an
>occasional check that the calibration is still good.
>At least that is how I understand it.
>This app is to be sold to every musician in the world, and he is
>wondering whether he should hard code the NIST IP into the phone to use
>as an ntp server. (NONONONONO) or perhaps use the pool. I think he is
>worried that since the pool does not apparently use NIST as the source
>for the time, that the time in the pool is not good enough. He does not
>really understand ntp and the pool, and GPS time and thus is worried
>that using the pool might not be good enough for his needs. 

You really should read my posts before responding.  No, I do not
intend to hard-code NIST or any other server.  I never said I wanted
to.  No, the app is not intended for all musicians.  It is intended
for professional piano tuners only.  I sell about one per day.  And I
never said the pool would not be good enough for my needs.  I only
asked about the relative benefits of the pool vs. NIST, which "E-mail
sent...Blacklists" answered very nicely.

Robert Scott
Hopkins, MN

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