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.
Monthly Archives
September 2015
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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