[ntp:questions] NTPD can take 10 hours to achieve stability
Richard B. Gilbert
rgilbert88 at comcast.net
Wed Apr 20 20:13:19 UTC 2011
On 4/20/2011 3:42 PM, Chris Adams wrote:
> Once upon a time, David Lord<dlord at lordynet.org> said:
>> There are designs for temperature control of the motherboard
>> xtal and alternative of using an external 14.31818 MHz clock
>> source. Some of my motherboards even have an external source
> I have one server (really an old desktop motherboard turned to personal
> server use) that holds consistent drift, even when the temperature
> fluctuates (we had an air conditioner fail last week). The drift file
> consistently shows -0.2xx (-0.217 at the moment). I guess it is just
> blind luck that this mboard crystal is better than most?
It's more likely to be the case and ventilation fan. If the quartz
crystal is kept at a more or less constant temperature, the oscillator
will maintain a more or less uniform output frequency. If you REALLY
want a stable frequency output, you put the whole thing in an "oven"
which will maintain it at a constant temperature. Don't plan on baking
pizza in it, the "constant temperature" mentioned above would probably
be something in the range 100 to 150 degrees Fahrenheit.
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