More OCXO Adjustments

More twiddling of the OCXOs this afternoon. Austron 1250A:  was tune 375, +3.9e9; now tune 340, +4.5e12 FTS 1050A: was tune 55000, +2.1e9; now tune 54614, -1.7e12 Sulzer #1 (2.5 MHz): was tune +0.39, +7.2e9; now tune -0.56 (CCW past zero), -3.2e12 Sulzer #2 (5 MHz): was tune 9.23, -1.4e9; now tune 9.31, -1.2e11 All these comparisons are against an HP 5061A Cesium standard that tracks GPS at about -2e13.  The Sulzers have mechanical tuning (flexible shaft to a piston […]

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Some Frequency Trimming

I normally don’t adjust the frequency of the half dozen high quality quartz oscillators I have running in the lab.  I don’t rely on them for absolute frequency precision as I have better sources for that.  But I thought it was time to get them all tweaked reasonably closely so the offset isn’t too bad for a new set of experiments I’m getting ready to start. First was my OSA 8607-008 BVA, which was powered on in 2012 and hasn’t […]

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