On Feb 12, 2012, at 2:52 PM, Richard B. Gilbert wrote: > Rather than cooling the crystal it's customary to to put the crystal in an > "oven". This is not the oven usually used for cooking. What it does is to > heat the crystal to a temperature that can be maintained 24x7 and will be a > little warmer than the highest temperature that can be expected naturally. A > value in the range 120 to 130 degrees F could be used.
A crystal intended for "oven" use as an OCXO tends to be SC cut and seems to target a temperature of around 200F/90C, but is not very good at room temperatures and is not well suited for TCXO. The crystal on a motherboard is very likely to be AT cut, be most stable around 30C, and works reasonably well as a TCXO. These will give better timing if the system temp is kept stable and not too hot. Regards, -- -Chuck _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
