I did two hour measurement runs of three ’60s vintage Sulzer frequency standards against perhaps the best modern quartz standard available. These are pretty amazing results.
Over the years I’ve acquired a whole bunch of Sulzer OCXOs. One is dead, several have oven temperature control problems, but I have three powered up in the rack that still work amazingly well.
This one, Sulzer #3, is particularly interesting. It’s not on the standard 2.5 or 5 MHz
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More twiddling of the OCXOs this afternoon.
- Austron 1250A:Â 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;
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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
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I’ve intermittently had a blog running at febo.com for years now. I used it mainly as a logbook of experiments, and it wasn’t intended to be entertaining for visitors. I recently discovered that the blogging engine I used was hopelessly obsolete, so I’ve moved into the 21st century and installed
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