3 Vintage Sulzers Compared
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.
TASS Switching System announced, and fun with enclosures
Today TAPR announced availability of a project I've been working on for a while, a computer-controlled switch system called the "TASS." It consists of an 8-port relay bank that handles from DC to 150 MHz, a shield for an Arduino,…
Testing a ’60s vintage Sulzer OCXO — with a twist
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…
More OCXO Adjustments
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…
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…
John’s New Geekblog
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…