[time-nuts] Tbolt time constant
warrensjmail-one at yahoo.com
Mon Oct 12 19:49:33 UTC 2009
> Does the longer time constant actually make a "better" frequency standard
Depends how much of a hurry you are in to measure your freq.
A longer TC on the TBolt makes it have a lot less Phase noise
and Freq noise at low Tau and gate times under 100 seconds.
At longer times of 1000 sec + it does not make much difference
The effect at 1 sec can be very significant but still go unnoticed to most.
Tom has plots showing some of the effects.
Where it really show up is at the sub ns phase noise at 1 sec gate times.
From: "Hal Murray"
>> The only downside of the longer time constant seems to be that the PPS
>> seems to move around more, but as my primary concern is to use this as
>> a frequency standard, that's not an issue for me.
> Does the longer time constant actually make a "better" frequency standard, or
> does it just push the noise from one frequency region to another? Has
> anybody with gear good enough to measure close in noise looked at the
> spectrum for different time constants?
> These are my opinions, not necessarily my employer's. I hate spam.
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