[time-nuts] Thunderbolt test results

Peter Vince pvince at theiet.org
Fri Jun 11 09:29:40 EDT 2010


HI Bob,

     10 nanoseconds at the bottom, up to 10 microseconds at the top,
in three logarithmic sections.

Donal: Is the time-constant at its default of 100 seconds, and was the
above plot taken shortly after turning it on?  There has been lots of
talk on here about tweaking the performance.  Increasing the
time-constant to between 500 and 1000 seconds should help, as will
stabilising the environmental temperature.  Let it run for a few
weeks, and the oscillator will settle down, and you should get some
better results.

     TTFN,

          Peter


On 11 June 2010 14:20, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> The vertical axis on the plot is pretty tough to read. What is the scale?
>
> Bob
>
> On Jun 11, 2010, at 8:43 AM, Donal G wrote:
>
>> Hi Guys,
>>
>> I bought a Thunderbolt device recently.  I have done some
>> 10Mhz frequency tests in comparison to a Cesium reference.
>> Attached is MTIE plot.  Have any of you done similar tests? any comment on
>> my results?, is this normal operation when locked to the GPS?  I was
>> expecting better results that this!
>>
>> Thanks
>> Donal
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