[time-nuts] Fury Interface Board: 5MHz needed?
hmurray at megapathdsl.net
Thu Nov 8 12:42:54 EST 2007
> An illustration of what I meant would be what happens when someone
> opens the door to the lab where the GPSDO is located. The room
> temperature may change by a few degrees over a few minutes time,
> causing the oven to kick in (or out). That kind of change is too fast
> for the GPS to compensate for, and the increased (or decreased) oven
> current will drive a frequency change.
What's the typical time constant for a GPSDO? Is a single hard-wired number
appropriate or should the software adapt as conditions change?
What's the cycle time of a typical bang-bang air conditioner cooling a room
full of computers?
Here is one data point.
The graph about 1/3 of way down looks like about an hour.
It's a fun read if you like NTP.
These are my opinions, not necessarily my employer's. I hate spam.
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