); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY It was Rick who wrote about crystal aging. It is not predictable whether the crystal will go higher or go lower in frequency and there is no guarantee that it will age at a linear rate. The worst-case is when a crystal erratically jumps.
I had attended a conference of the Frequency Control Symposium of the IEEE in which the causes were discussed. There was disagreement among the experts. Some thought it was owing to the physical stress or surface imperfections caused by grinding and lapping. Others thought it may be partially a result of the etching. Others thought it was caused by microscopic impurities in the quartz. Others talked about the effects of plating. Rick wrote about the microcrystalline structural defects. Perhaps all of these contribute and it is unpredictable how they will add together. 73, Jeffrey Pawlan WA6KBL _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
