On 4/20/2011 3:42 PM, Chris Adams wrote:
Once upon a time, David Lord<[email protected]> 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
connector.
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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