[time-nuts] Cheap jitter measurements

Bob Bownes bownes at gmail.com
Tue Apr 3 14:54:25 EDT 2018


Find a nice used 5370/5371? :)

There is a 5371 on ebay for $250 at the moment.

On Tue, Apr 3, 2018 at 1:47 PM, Gary E. Miller <gem at rellim.com> wrote:

> Time-nuts!
>
> With care I can measure GPS jitter on a RasPi to a bit over 300 nano sec
> resolution.  That is the smallest increment of the RasPi 3B clock with
> a 64-bit kernel.  That is clearly not time-nuts accuracy.
>
> What would you guys suggest as the cheapest way to see jitter down to
> around 1 nano second?
>
> I'm thinking maybe something like a rubidium standard (FE-5680A) and
> a TICC-TAPR?  But that would put me out around $400.
>
> The picPET does not look accurate enough.  Maybe a clever way to use it
> for more accuracy?  Is there a picPET like thing cheaper than the
> TICC-TAPR?
>
> Ideas?
>
> RGDS
> GARY
> ------------------------------------------------------------
> ---------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem at rellim.com  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>     "If you can’t measure it, you can’t improve it." - Lord Kelvin
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