I changed the disciplining time constant on my Thunderbolts and you can
improve it (over the 100 second default). I changed it to 200 sec, then
ran a day, the 300 sec, ran another day, etc.
One unit was best at 400 seconds, the other unit at 600 seconds. What
you should see is less movement in the frequency as you increase the
time constant, and then at some point, it will overshoot and take longer
to recover - then you back up.
In the Thunderbird Monitor program, Setup drop down, Then Disciplining,
then change constant in Loop Dynamics box. AFter changing it, press Set
Dynamics in the Loop Dynamics box, then Save Segment on the very bottom.
You can exit and come back to confirm it took the change.
Brian KD4FM
Peter Vince wrote:
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 <[email protected]> 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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